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HomeMy WebLinkAbout2023-07-17 Storm Water Response to Comments_YarmouthStorm water report revised 7-10-23Stormwater Report FOR COLBEA ENTERPRISES, LLC 473, 479 & 487 Station Ave, Yarmouth, MA Prepared By: 31 Hayward Street, Ste. E-1 Phone: 508-528-0770 Garrett Small, P.E. Date: 02/23/2023 Revised: 07/05/2023 HFA Project No. 42-21-20002 Table of Contents Summary… ......................................................................................................................... 3 Stormwater Management… ................................................................................................ 3 Massachusetts Stormwater Management Standards Analysis… ........................................ 5 Pollutant Removal Report……………………………………………………………..….11 Existing Watershed Plan… ................................................................................................. 15 Proposed Watershed Plan… ............................................................................................... 17 StormTech Isolator Row Sizing… .................................................................................... 19 Soil Evaluation Report… .................................................................................................. 21 Existing HydroCAD Calculations…................................................................................. 67 Proposed HydroCAD Calculations… ............................................................................... 78 SUMMARY The project site consists of Map 97, Lot 1 & Lot 2, both N/F Jeanne L. Luby & Karen J. Luby-Drew, and a portion of Map 97, Lot 3 N/F Station Ave. LLC, and is located on the southern side of Station Avenue in Yarmouth, MA. The total area of the combined lots is 51,262 SF (1.18 Acres), and is predominantly an undeveloped Pitch Pine forest, with 601 SF of pavement encroachment from the abutter to the west. The proposed project includes the construction of a new 3,600 s.f. Seasons Corner Market with basement, a new 3,648 s.f. overhead canopy with 6 new fuel dispensing islands with diesel product, 2 EV charging spaces, 2 new 15k underground double walled fiberglass storage tanks with associated utility, grading, storm water, landscaping and curbing improvements. Twenty-eight (28) parking stalls, including two handicap, are proposed to serve the retail fueling facility. There are no wetlands, floodplain areas, agricultural uses, or historical cemeteries on or immediately adjacent to, the subject property. The subject property is zoned B-1 Business District, and is also in the Aquifer Protection Overlay District. STORMWATER MANAGEMENT The existing project area has no stormwater management components, with the rear third of the site sloping toward the abutter to the east, which contains abandoned railroad tracks. The front two thirds of the site flows to two depressed areas on site which retain and infiltrate stormwater. The proposed stormwater management system design consists of two Bioretention Areas with 1,500 gallon oil/grit separators, and two subsurface infiltration chamber systems using ADS Stormtech MC-4500 chambers, with treatment provided by Isolator Rows. The proposed condition will collect and treat runoff prior to discharge. A concrete curb along the edge of the pavement separating the paved areas of the site from the landscape areas will help convey runoff to the proposed on-site drainage system. The soil onsite is a 252A Carver coarse sand soil map unit. The NRCS Custom Soil Resource Report is attached for reference. A total of eight (8) test pits were dug onsite on November 29, 2018 to evaluate the soil suitability for infiltration of stormwater runoff, as well as for septic system design. The soil evaluation was performed by Edward J. Avizinis of Natural Resource Services, Inc. The soil was very consistent in all holes. All test pits revealed soils with an HSG of A, coarse sand types of soils. The saturated hydraulic conductivity of the least transmissive layer should be 8.27 in/hr, and no indication of the SHWT was encountered, with a test pipe at the front of the site dry to a depth of 16’ at least. The soil evaluation report is attached for reference. The proposed drainage system has been designed and sized to reduce total site peak runoff rates, for all storm events. The following chart provides a summary of the storm events, and comparison between the existing and proposed site conditions. Storm Event Existing Conditions Proposed Conditions To Street To Abutter Total To Street To Abutter Total 2 Year 0.00 0.00 0.00 0.00 0.00 0.00 10 Year 0.00 0.02 0.02 0.00 0.00 0.00 25 Year 0.00 0.10 0.10 0.00 0.01 0.01 50 Year 0.00 0.28 0.28 0.00 0.03 0.03 100 Year 0.00 0.55 0.55 0.00 0.08 0.08 Drainage Calculations In support of the above analysis, calculations performed with HydroCAD 10.00 for the 2 year, 10 year, 25 year, 50 year and 100-year storm events are attached. The calculations clearly illustrate that there will be no net increase in runoff rates due to the proposed development, and in fact rates will be decreased for all storm events. MASS DOT STORMWATER STATEMENT There will be no increase in discharge of stormwater runoff to any MASS DOT state drainage system as a result of the proposed site improvements with this project. Massachusetts Stormwater Management Standards Analysis The Stormwater system for the proposed project was designed to meet the current standards of the Mass DEP Stormwater Management Policy, specifically Standard 5 for construction of retail motor fuel facility. LID: The site development has been minimized as much as possible, and two Bioretention Areas are proposed for natural stormwater treatment. Since this development includes a drive-thru, and due to the location of the new septic system, it was not feasible to infiltrate the building roof runoff right at the source. The project does provide eleven (11) large canopy trees including Red Maples and Pin Oaks planted over impervious surfaces. The use of porous pavement was not considered appropriate for this site, since the use is a LUHPPL and it is located in the Aquifer Protection District. Standard 1: There are no new untreated discharges. Standard 2: Calculations demonstrate that post development peak flows do not exceed pre-development peak flows. Off-site flooding for the 100 year event was not analyzed, however post development peak discharge rates do not exceed pre-development rates and it is assumed that no increased off-site flooding impacts are caused by the proposed development. Standard 3: Groundwater Recharge: Pavement infiltration is provided where no infiltration presently exists, increasing overall site recharge from existing conditions. Recharge = .60 inches of runoff x total impervious area (Hydrologic Group A) Recharge = (.60) x 34,606 SF/12 Recharge = 1,730 CF The volume of the infiltration systems is 11,769 C.F., which exceeds the 1,730 C.F. required. Draw Down Time: The infiltration systems have been designed to exfiltrate in less than 72 hours with a basin floor as flat as possible to provide a uniform ponding and exfiltration of runoff. Chamber system #1 Soil perc rate = 8.27 in/hr = 0.69 ft/hr Chamber field floor area = 764 S.F. Storage Volume (100 year storm) = 3,169 C.F. Exfiltration depth = Storage volume / Chamber field floor area Exfiltration depth = 3,169 C.F. / 764 S.F. = 4.15 ft. Time of exfiltration = exfiltration depth / soil perc rate = 4.15 ft / 0.69 ft/ hr = 6.01Chamber system #2 Soil perc rate = 8.27 in/hr = 0.69 ft/hr Chamber field floor area = 842 S.F. Basin Volume (100 year storm) = 3,508 C.F. Exfiltration depth = Storage volume / Chamber field floor area Exfiltration depth = 3,508 C.F. / 842 S.F. = 4.17 ft. Time of exfiltration = exfiltration depth / soil perc rate = 4.17 ft / 0.69 ft/ hr = 6.04 hrs Bioretention Area #1 Soil perc rate = 8.27 in/hr = 0.69 ft/hr Basin area = 2,642 S.F. Basin Volume (100 year storm) = 3,806 C.F. Exfiltration depth = Storage volume / Chamber field floor area Exfiltration depth = 3,806 C.F. /2,642 S.F.=1.44 ft. Time of exfiltration = exfiltration depth / soil perc rate = 1.44 ft / 0.69 ft/ hr = 2.09 hrs Bioretention Area #2 Soil perc rate = 8.27 in/hr = 0.69 ft/hr Basin area = 916 S.F. Basin Volume (100 year storm) = 1,301 C.F. Exfiltration depth = Storage volume / Chamber field floor area Exfiltration depth = 916 C.F. /1,301 S.F.=.70 ft. Time of exfiltration = exfiltration depth / soil perc rate = .70 ft / 0.69 ft/ hr = 1.01 hrs Standard 4: Deep sump catch basins will provide 25% TSS removal prior to a secondary treatment consisting of a 1,500 gallon oil/grit separator for all of the sites pavement runoff, resulting in 44% TSS removal prio to infiltration. Additionally, filter fabric wrapped isolator row as part of a subsurface infiltration system will also provide treatment prior to infiltration. Water Quality Volume: WQv = (1”) (I)/12 WQv = 34,606/12 WQv = 2,884 CF The volume of the infiltration systems is 11,769 C.F., which exceeds the 2,884 C.F. required. Oil / Grit Separator Sizing Provide pool storage in the first chamber to accommodate the required water quality volume or 400 cubic feet per acre of impervious surface. Oil / Grit separator #1 (1,500 gal.) I = 1,789 S.F. = 0.04 Acre Vreq= 400 C.F/acre x 0.04 acre = 16.0 C.F Volume of the first chamber = B x W x H = 3 x 5 x 3 = 45 C.F The Volume of the first chamber is 45 C.F., which exceeds the required 16.0 C.F. Oil / Grit separator #2 (2,000 gal.) I = 5,869 S.F. = 0.13 Acre Vreq= 400 C.F/acre x 0.13 acre = 52.0 C.F Volume of the first chamber = B x W x H = 4.167 x 5 x 3 = 62.5 C.F The Volume of the first chamber is 62.5 C.F., which exceeds the required 52.0 C. Isolator Row Sizing The isolator rows have been sized using an isolator row sizing chart which has been provided by ADS Stormtech. In order to size the isolator row adequately, it is necessary to determine the flow rate generated by the water quality volume. Attached is the isolator row sizing chart as a reference. The results of the calculations are as follows. Chamber System #1- (8) MC-4500 WQf = 0.11 CFS Treated flow rate per chamber = 0.17 CFS Total treatment flow rate = (No. chambers) X (treated flow rate per chamber) Total Treatment flow rate = 8 X 0.17 = 1.36 CFS The Total treatment flow rate is 1.36 CFS, which exceeds the required 0.11 CFS. Chamber System #2- (10) MC-4500 WQf = 0.27 CFS Treated flow rate per chamber = 0.17 CFS Total treatment flow rate = (No. chambers) X (treated flow rate per chamber) Total Treatment flow rate = 10 X 0.17 = 1.70 CFS The Total treatment flow rate is 1.70 CFS, which exceeds the required 0.27 CFS. Standard 5: The proposed site is a multi-use retail and motor fuel facility. The operator of the motor fuel facility is trained to respond to small spills and there are response materials stored on site. Standard 6: The site is located in the Aquifer Protection Overlay District, and the stormwater system utilizes BMPs appropriate for the district. Standard 7: The proposed work is not considered redevelopment due to the existing impervious area size. Standard 8: The project duration is expected to be less than four months. An Erosion Control Plan is part of the storm water package and a SWPPP will be prepared and maintained on site by the General Contractor throughout the duration of the construction. Typical measures to be employed during construction include sedimentation control by compost filter sock/silt fencing and truck exit controls. Standard 9: An Operation and Maintenance Plan is submitted as part of this storm water plan. Standard 10: Illicit Discharge Compliance Statement: This statement reflects the commitment of both the owner and operator of the subject facility to fully comply with the Massachusetts Stormwater Handbook Minimum Standard 10 - that there presently does not exist and that there will be NO ILLICIT DISCHARGES at this facility. An illicit discharge is defined as any discharge not entirely comprised of stormwater that are not specifically authorized by a National Pollutant Discharge Elimination System (NPDES) or permit. The property owner is ultimately responsible for the maintenance of all on-site drainage structures as defined in the Stormwater Operation and Maintenance Plan and as further detailed in the approved site plan and related stormwater drainage study. The future property owner Colbea Enterprises, LLC intends to manage maintenance and operations. The site is serviced by an OWTS that is not connected in any way with the stormwater system which will be verified during construction and documented on the as-built construction plan. Stormwater structures to be installed at the site include: piping between the roof areas and the associated underground infiltration system, oil/grit separators after a deep sump catch basin with hooded outlet to Bioretention Areas. There are no other discharges at the site. POLLUTANT REMOVAL REPORT 8 State MASSACHUSETTS Municipality YARMOUTH Permit Type Individual Permit Number Major Watershed CAPE COD TP Load Reduction Target 0.6 TN Load Reduction Target 0.3 TSS Load Reduction Target 0.9 Table 1. Project Summary Credit for YARMOUTH, MASSACHUSETTS Project Type Removed Phosphorus Load (lb/yr) Removed Nitrogen Load (lb/yr) Removed Sediment Load (lb/yr) Structural 1.15 9.7 249.08 Non-Structural 0.1 1.35 0 Land Use Conversion -1.96 -17.16 -410.58 Total -0.7 -6.11 -161.5 Table 2. Structural Project Summary for YARMOUTH, MASSACHUSETTS Project ID BMP Type BMP Storage Capacity (ft3)/ Filter Depth (in.) Phosphorus BMP Efficiency (%) Nitrogen BMP Efficiency (%) Sediment BMP Efficiency (%) Removed Phosphorus Load (lb/yr) Removed Nitrogen Load (lb/yr) Removed Sediment Load (lb/yr) Impervious Area Treated (ac) Runoff Depth (in.) Bio1 ENHANCED BIOFILTRATION 3806 89 86 100 0.13 1.04 30.19 0.08 13.11 Bio2 ENHANCED BIOFILTRATION 1301 89 86 100 0.06 0.52 15.1 0.04 8.96 Infil1 INFILTRATION TRENCH 3015 100 100 100 0.43 3.62 90.57 0.24 3.46 Infil2 INFILTRATION TRENCH 2874 100 100 100 0.53 4.52 113.22 0.3 2.64 Table 3. Non-Structural Project Summary for YARMOUTH, MASSACHUSETTS Project ID BMP Type BMP Storag e Capaci ty Phosphor us BMP Efficiency (%) Nitroge n BMP Efficien cy (%) Sedime nt BMP Efficien cy (%) Removed Phosphor us Load (lb/yr) Remov ed Nitroge n Load (lb/yr) Remov ed Sedime nt Load (lb/yr) Impervio us Area Treated (ac) Runo ff Dept h (in.) Sweep ENHANCED SWEEPING PROGRAM N/A 2 2 0 0 0.04 0 0.79 N/A CBclea n CATCH BASIN CLEANING N/A 2 6 0 0.03 0.71 0 0.79 N/A Waste ORGANIC WASTE/LEAF LITTER COLLECTION PROGRAM N/A 5 5 0 0.07 0.6 0 0.79 N/A Table 4. Land Use Conversion Project Summary for YARMOUTH, MASSACHUSETTS Project ID Removed Phosphorus Load (lb/yr) Removed Nitrogen Load (lb/yr) Removed Sediment Load (lb/yr) Impervious Area Treated (ac) 42-21-20002 -1.96 -17.16 -410.58 1.18 EXISTING WATERSHED PLAN 8 PROPOSED WATERSHED PLAN 10 STORMTECH ISOLATOR ROW SIZING 12 STORMTECH ISOLATOR ROW SIZING CHART SC-310 SC-740 DC-780 MC-3500 MC-4500 Chamber Area (Sq.Ft.) 20 27.8 27.8 43.2 30.1 Treated Flow Rate per chamber (CFS) 0.11 0.15 0.15 0.24 0.17 NOTE: Testing of the Isolator Row completed by Tennesse Tech has been verified by NJCAT and it has shown to have a TSS removal efficiency of 84% for SIL-CO-SIL 250 NJCAT verified Treated Flow Rate (GPM / Sq.Ft.) 2.5 13 SOIL EVALUATION REPORT 14 United States Department of Agriculture A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Barnstable County, MassachusettsNatural Resources Conservation Service November 9, 2018 15 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/ portal/nrcs/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil Scientist (http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/contactus/? cid=nrcs142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 16 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 17 Contents Preface....................................................................................................................2 How Soil Surveys Are Made..................................................................................5 Soil Map..................................................................................................................8 Soil Map (487 Station Ave)...................................................................................9 Legend................................................................................................................10 Map Unit Legend (487 Station Ave)....................................................................11 Map Unit Descriptions (487 Station Ave)............................................................11 Barnstable County, Massachusetts.................................................................13 252A—Carver coarse sand, 0 to 3 percent slopes......................................13 252B—Carver coarse sand, 3 to 8 percent slopes......................................14 252C—Carver coarse sand, 8 to 15 percent slopes...................................15 484D—Plymouth-Barnstable complex, hilly, extremely bouldery................16 602—Urban land.........................................................................................18 References............................................................................................................20 4 18 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil-vegetation-landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 5 19 scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil-landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil-landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field-observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and Custom Soil Resource Report 6 20 identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. Custom Soil Resource Report 7 21 Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 8 22 9 Custom Soil Resource Report Soil Map (487 Station Ave)461540046155004615600461570046158004615900461540046155004615600461570046158004615900398800 398900 399000 399100 399200 399300 399400 399500 399600 399700 398800 398900 399000 399100 399200 399300 399400 399500 399600 399700 41° 41' 20'' N 70° 12' 57'' W41° 41' 20'' N70° 12' 15'' W41° 41' 0'' N 70° 12' 57'' W41° 41' 0'' N 70° 12' 15'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 19N WGS84 0 200 400 800 1200 Feet 0 50 100 200 300 Meters Map Scale: 1:4,430 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. 23 MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:25,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Barnstable County, Massachusetts Survey Area Data: Version 15, Sep 5, 2018 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Dec 31, 2009—Mar 22, 2017 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Custom Soil Resource Report 10 24 Map Unit Legend (487 Station Ave) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 252A Carver coarse sand, 0 to 3 percent slopes 38.3 39.9% 252B Carver coarse sand, 3 to 8 percent slopes 35.4 36.9% 252C Carver coarse sand, 8 to 15 percent slopes 3.9 4.0% 484D Plymouth-Barnstable complex, hilly, extremely bouldery 0.6 0.6% 602 Urban land 17.8 18.5% Totals for Area of Interest 95.9 100.0% Map Unit Descriptions (487 Station Ave) The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. Custom Soil Resource Report 11 25 The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. Custom Soil Resource Report 12 26 Barnstable County, Massachusetts 252A—Carver coarse sand, 0 to 3 percent slopes Map Unit Setting National map unit symbol: 98qc Elevation: 0 to 1,000 feet Mean annual precipitation: 37 to 50 inches Mean annual air temperature: 45 to 55 degrees F Frost-free period: 120 to 240 days Farmland classification: Not prime farmland Map Unit Composition Carver and similar soils: 80 percent Minor components: 20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Carver Setting Landform: Outwash plains Landform position (two-dimensional): Summit Landform position (three-dimensional): Tread Down-slope shape: Convex Across-slope shape: Convex Parent material: Loose sandy glaciofluvial deposits Typical profile H1 - 0 to 7 inches: coarse sand H2 - 7 to 17 inches: coarse sand H3 - 17 to 64 inches: coarse sand Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Excessively drained Runoff class: Negligible Capacity of the most limiting layer to transmit water (Ksat): Very high (20.00 to 99.90 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low (about 3.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: A Hydric soil rating: No Minor Components Merrimac Percent of map unit: 6 percent Hydric soil rating: No Custom Soil Resource Report 13 27 Hinckley Percent of map unit: 6 percent Hydric soil rating: No Eastchop Percent of map unit: 4 percent Hydric soil rating: No Enfield Percent of map unit: 4 percent Hydric soil rating: No 252B—Carver coarse sand, 3 to 8 percent slopes Map Unit Setting National map unit symbol: 98qd Elevation: 0 to 1,000 feet Mean annual precipitation: 37 to 50 inches Mean annual air temperature: 45 to 55 degrees F Frost-free period: 120 to 240 days Farmland classification: Not prime farmland Map Unit Composition Carver and similar soils: 80 percent Minor components: 20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Carver Setting Landform: Outwash plains Landform position (two-dimensional): Shoulder Landform position (three-dimensional): Riser Down-slope shape: Convex Across-slope shape: Convex Parent material: Sandy glaciofluvial deposits; loose sandy glaciofluvial deposits Typical profile H1 - 0 to 7 inches: coarse sand H2 - 7 to 17 inches: coarse sand H3 - 17 to 64 inches: coarse sand Properties and qualities Slope: 3 to 8 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Excessively drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Very high (20.00 to 99.90 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Custom Soil Resource Report 14 28 Frequency of ponding: None Available water storage in profile: Low (about 3.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: A Hydric soil rating: No Minor Components Hinckley Percent of map unit: 6 percent Hydric soil rating: No Merrimac Percent of map unit: 6 percent Hydric soil rating: No Enfield Percent of map unit: 4 percent Hydric soil rating: No Eastchop Percent of map unit: 4 percent Hydric soil rating: No 252C—Carver coarse sand, 8 to 15 percent slopes Map Unit Setting National map unit symbol: 98qf Elevation: 0 to 1,000 feet Mean annual precipitation: 37 to 50 inches Mean annual air temperature: 45 to 55 degrees F Frost-free period: 120 to 240 days Farmland classification: Not prime farmland Map Unit Composition Carver and similar soils: 75 percent Minor components: 25 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Carver Setting Landform: Ice-contact slopes Landform position (two-dimensional): Backslope Landform position (three-dimensional): Riser Down-slope shape: Linear Across-slope shape: Convex Parent material: Sandy glaciofluvial deposits; loose sandy glaciofluvial deposits Custom Soil Resource Report 15 29 Typical profile H1 - 0 to 7 inches: coarse sand H2 - 7 to 17 inches: coarse sand H3 - 17 to 64 inches: coarse sand Properties and qualities Slope: 8 to 15 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Excessively drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Very high (20.00 to 99.90 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low (about 3.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: A Hydric soil rating: No Minor Components Merrimac Percent of map unit: 9 percent Hydric soil rating: No Hinckley Percent of map unit: 8 percent Hydric soil rating: No Eastchop Percent of map unit: 4 percent Hydric soil rating: No Plymouth Percent of map unit: 4 percent Hydric soil rating: No 484D—Plymouth-Barnstable complex, hilly, extremely bouldery Map Unit Setting National map unit symbol: 98s2 Elevation: 0 to 1,000 feet Mean annual precipitation: 40 to 50 inches Mean annual air temperature: 45 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: Not prime farmland Custom Soil Resource Report 16 30 Map Unit Composition Plymouth and similar soils: 55 percent Barnstable and similar soils: 20 percent Minor components: 25 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Plymouth Setting Landform: Moraines Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down-slope shape: Linear Across-slope shape: Convex Parent material: Loose sandy glaciofluvial deposits and/or loose sandy ablation till; loose sandy glaciofluvial deposits and/or loose sandy ablation till Typical profile H1 - 0 to 3 inches: loamy coarse sand H2 - 3 to 29 inches: gravelly loamy coarse sand H3 - 29 to 64 inches: gravelly coarse sand Properties and qualities Slope: 15 to 25 percent Percent of area covered with surface fragments: 9.0 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Excessively drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat): High to very high (6.00 to 20.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low (about 3.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: A Hydric soil rating: No Description of Barnstable Setting Landform: Moraines Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down-slope shape: Linear Across-slope shape: Convex Parent material: Friable loamy ablation till over reworked sandy glaciofluvial deposits; loamy ablation till over reworked sandy outwash Typical profile H1 - 0 to 1 inches: sandy loam H2 - 1 to 23 inches: sandy loam H3 - 23 to 64 inches: coarse sand Custom Soil Resource Report 17 31 Properties and qualities Slope: 15 to 25 percent Percent of area covered with surface fragments: 9.0 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat): High (2.00 to 6.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low (about 4.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: A Hydric soil rating: No Minor Components Nantucket Percent of map unit: 10 percent Hydric soil rating: No Carver Percent of map unit: 5 percent Hydric soil rating: No Hinckley Percent of map unit: 5 percent Hydric soil rating: No Merrimac Percent of map unit: 5 percent Hydric soil rating: No 602—Urban land Map Unit Setting National map unit symbol: 98s7 Frost-free period: 120 to 220 days Farmland classification: Not prime farmland Map Unit Composition Urban land: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Custom Soil Resource Report 18 32 Description of Urban Land Setting Parent material: Excavated and filled land Minor Components Udipsamments Percent of map unit: 15 percent Hydric soil rating: Unranked Custom Soil Resource Report 19 33 References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. http://www.nrcs.usda.gov/wps/portal/ nrcs/detail/national/soils/?cid=nrcs142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ home/?cid=nrcs142p2_053374 United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.nrcs.usda.gov/wps/portal/nrcs/ detail/national/landuse/rangepasture/?cid=stelprdb1043084 20 34 United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. http://www.nrcs.usda.gov/wps/portal/ nrcs/detail/soils/scientists/?cid=nrcs142p2_054242 United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/? cid=nrcs142p2_053624 United States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf Custom Soil Resource Report 21 35 Natural Resource Services, Inc. P.O. Box 311 Harrisville, RI 02830 401-568-7390 FAX 401-568-7490 December 3, 2018 Amy L. Vonhone Town of Yarmouth Health Office 1146 Route 28 South Yarmouth, MA 02664 Dear Ms. Vonhone: Enclosed please find information regarding soil evaluation test holes performed at a site on Station Avenue (Plat 97, Lots 1, 2 and Portion of 3). The information provided includes Percolation Test Form 12 as well as Form 11 for Test Holes 1 through 6. A site sketch depicting the location of the test holes and approximate distances to bench marks has been included. Please do not hesitate to contact me regarding the work performed. Very truly yours, Edward J. Avizinis, PWS, CPSS Soil Evaluator Enclosures Cc: Paul Sylvia, Ayoub Engineering 36 St a t i o n A v e fence corner property corner SW1 TH4TH3 TH1 TH2 TH5 TH6 SW2 up up 24/79 up 24/79 1/2 monitoring well property corner Ø Ø Ø % @A @A @A @A @A %% @A @A @A% USGS, MassGIS ¯ Soil Evaluation Site SketchStation Ave Yarmouth, MA MassGIS 2013 ImagePerformed byEdward J. Avizinis, PWS, CPSS - 11/29/18Located using hand-held Trimble GeoXT (c) MassGIS Natural Resource Services, Inc.PO Box 311 p: (401) 568-7390180 Tinkham Lane f: (401) 568-7490Harrisville, RI 02830 FOR ILLUSTRATIVE PURPOSES ONLYNOT A SURVEY PLAN 0 100 20050Feet Legend @A Approximate Test Hole Locations Approximate Site Location (Town GIS) Approximate SW Locations@A 37 St a t i o n A v e +/- 116'+/- 116'+/- 153'+/- 142'+/- 186'+/- 83'+/- 52'+/- 110'+/- 113'+/- 152' +/- 35'+/- 43'fence corner property corner SW1 TH4TH3 TH1 TH2 TH5 TH6 SW2 up up 24/79 up 24/79 1/2 monitoring well property corner Ø Ø Ø % @A @A @A @A @A %% @A @A @A% USGS, MassGIS ¯ Soil Evaluation Site SketchStation Ave Yarmouth, MA MassGIS 2013 ImagePerformed byEdward J. Avizinis, PWS, CPSS - 11/29/18Located using hand-held Trimble GeoXT (c) MassGIS Natural Resource Services, Inc.PO Box 311 p: (401) 568-7390180 Tinkham Lane f: (401) 568-7490Harrisville, RI 02830 FOR ILLUSTRATIVE PURPOSES ONLYNOT A SURVEY PLAN 0 100 20050Feet Legend @A Approximate Test Hole Locations Approximate Site Location (Town GIS) Approximate SW Locations@A 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 EXISTING HYDROCAD CALCULATIONS 60 1S Existing retained north 2S Existing retained south EX Abutter Existing runoff to abutter 3P EX depression north 4P EX depression south Routing Diagram for 42-21-20002HydrocadEX2 Prepared by {enter your company name here}, Printed 7/10/2023 HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Subcat Reach Pond Link HydrocadEX Printed 1/30/2019Prepared by {enter your company name here} Page 2HydroCAD® 10.00-19 s/n 01750 © 2016 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (sq-ft) CN Description (subcatchment-numbers) 601 98 Paved parking, HSG A (Ex Abutter) 18,340 45 Woods, Poor, HSG A (Ex Abutter) 62 Type III 24-hr 2-Year Rainfall=3.26"HydrocadEX Printed 1/30/2019Prepared by {enter your company name here} Page 3HydroCAD® 10.00-19 s/n 01750 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=18,941 sf 3.17% Impervious Runoff Depth>0.08"Subcatchment Ex Abutter: Existing runoff Tc=5.0 min CN=47 Runoff=0.00 cfs 129 cf 63 Type III 24-hr 2-Year Rainfall=3.26"HydrocadEX Printed 1/30/2019Prepared by {enter your company name here} Page 4HydroCAD® 10.00-19 s/n 01750 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment Ex Abutter: Existing runoff to abutter [49] Hint: Tc<2dt may require smaller dt Runoff = 0.00 cfs @ 14.66 hrs, Volume= 129 cf, Depth> 0.08" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=3.26" Area (sf) CN Description 18,340 45 Woods, Poor, HSG A 601 98 Paved parking, HSG A 18,941 47 Weighted Average 18,340 96.83% Pervious Area 601 3.17% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, 64 Type III 24-hr 10-Year Rainfall=4.74"HydrocadEX Printed 1/30/2019Prepared by {enter your company name here} Page 5HydroCAD® 10.00-19 s/n 01750 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=18,941 sf 3.17% Impervious Runoff Depth>0.45"Subcatchment Ex Abutter: Existing runoff Tc=5.0 min CN=47 Runoff=0.09 cfs 707 cf 65 Type III 24-hr 10-Year Rainfall=4.74"HydrocadEX Printed 1/30/2019Prepared by {enter your company name here} Page 6HydroCAD® 10.00-19 s/n 01750 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment Ex Abutter: Existing runoff to abutter [49] Hint: Tc<2dt may require smaller dt Runoff = 0.09 cfs @ 12.27 hrs, Volume= 707 cf, Depth> 0.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.74" Area (sf) CN Description 18,340 45 Woods, Poor, HSG A 601 98 Paved parking, HSG A 18,941 47 Weighted Average 18,340 96.83% Pervious Area 601 3.17% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, 66 Type III 24-hr 25-Year Rainfall=5.88"HydrocadEX Printed 1/30/2019Prepared by {enter your company name here} Page 7HydroCAD® 10.00-19 s/n 01750 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=18,941 sf 3.17% Impervious Runoff Depth>0.88"Subcatchment Ex Abutter: Existing runoff Tc=5.0 min CN=47 Runoff=0.31 cfs 1,390 cf 67 Type III 24-hr 25-Year Rainfall=5.88"HydrocadEX Printed 1/30/2019Prepared by {enter your company name here} Page 8HydroCAD® 10.00-19 s/n 01750 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment Ex Abutter: Existing runoff to abutter [49] Hint: Tc<2dt may require smaller dt Runoff = 0.31 cfs @ 12.11 hrs, Volume= 1,390 cf, Depth> 0.88" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 25-Year Rainfall=5.88" Area (sf) CN Description 18,340 45 Woods, Poor, HSG A 601 98 Paved parking, HSG A 18,941 47 Weighted Average 18,340 96.83% Pervious Area 601 3.17% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, 68 Type III 24-hr 100-Year Rainfall=8.15"HydrocadEX Printed 1/30/2019Prepared by {enter your company name here} Page 9HydroCAD® 10.00-19 s/n 01750 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=18,941 sf 3.17% Impervious Runoff Depth>2.02"Subcatchment Ex Abutter: Existing runoff Tc=5.0 min CN=47 Runoff=0.92 cfs 3,191 cf 69 Type III 24-hr 100-Year Rainfall=8.15"HydrocadEX Printed 1/30/2019Prepared by {enter your company name here} Page 10HydroCAD® 10.00-19 s/n 01750 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment Ex Abutter: Existing runoff to abutter [49] Hint: Tc<2dt may require smaller dt Runoff = 0.92 cfs @ 12.09 hrs, Volume= 3,191 cf, Depth> 2.02" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=8.15" Area (sf) CN Description 18,340 45 Woods, Poor, HSG A 601 98 Paved parking, HSG A 18,941 47 Weighted Average 18,340 96.83% Pervious Area 601 3.17% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, 70 PROPOSED HYDROCAD CALCULATIONS 71 5S Proposed retained north Bio#1 Area to Bio#1 Bldg Building Roof Canopy Canopy Roof Pro Abutter Proposed runoff to abutter To CB1 Area to CB#1 To CB2 Area to CB#2 To CB3 Area to CB#3 To DI#1 Area to DI#1 6P PRO depression north 16 (16) MC-4500 CHAMBERS#1 20 (20) MC-4500 CHAMBERS#2 Bio1 Bioretention Area #1 Bio2 Bioretention Area #2 Routing Diagram for 42-21-20002HydrocadPRO2 Prepared by {enter your company name here}, Printed 7/10/2023 HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Subcat Reach Pond Link 42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 2HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Project Notes Rainfall events imported from "Atlas-14-Rain.txt" for 436 MA Barnstable East 42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 3HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (sq-ft) CN Description (subcatchment-numbers) 16,833 39 >75% Grass cover, Good, HSG A (5S, Bio#1, Pro Abutter, To CB1, To CB2, To CB3) 27,293 98 Paved parking, HSG A (To CB1, To CB2, To CB3, To DI#1) 7,248 98 Unconnected roofs, HSG A (Bldg, Canopy) 51,374 79 TOTAL AREA 42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 4HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (sq-ft) Soil Group Subcatchment Numbers 51,374 HSG A 5S, Bio#1, Bldg, Canopy, Pro Abutter, To CB1, To CB2, To CB3, To DI#1 0 HSG B 0 HSG C 0 HSG D 0 Other 51,374 TOTAL AREA 42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 5HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (sq-ft) HSG-B (sq-ft) HSG-C (sq-ft) HSG-D (sq-ft) Other (sq-ft) Total (sq-ft) Ground Cover Sub Num 16,833 000016,833 >75% Grass cover, Good 27,293 000027,293 Paved parking 7,248 00007,248 Unconnected roofs 51,374 000051,374 TOTAL AREA Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 6HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1,151 sf 0.00% Impervious Runoff Depth>0.00"Subcatchment 5S: Proposed retained north Tc=5.0 min CN=39 Runoff=0.00 cfs 0 cf Runoff Area=4,670 sf 0.00% Impervious Runoff Depth>0.00"Subcatchment Bio#1: Area to Bio#1 Tc=5.0 min CN=39 Runoff=0.00 cfs 0 cf Runoff Area=3,600 sf 100.00% Impervious Runoff Depth>3.03"Subcatchment Bldg: Building Roof Tc=5.0 min CN=98 Runoff=0.26 cfs 908 cf Runoff Area=3,648 sf 100.00% Impervious Runoff Depth>3.03"Subcatchment Canopy: Canopy Roof Tc=5.0 min CN=98 Runoff=0.27 cfs 920 cf Runoff Area=3,472 sf 0.00% Impervious Runoff Depth>0.00"Subcatchment Pro Abutter: Proposed runoff Tc=5.0 min CN=39 Runoff=0.00 cfs 0 cf Runoff Area=14,087 sf 73.17% Impervious Runoff Depth>1.59"Subcatchment To CB1: Area to CB#1 Tc=5.0 min CN=82 Runoff=0.60 cfs 1,861 cf Runoff Area=3,353 sf 53.36% Impervious Runoff Depth>0.86"Subcatchment To CB2: Area to CB#2 Tc=5.0 min CN=70 Runoff=0.07 cfs 241 cf Runoff Area=11,524 sf 80.94% Impervious Runoff Depth>1.97"Subcatchment To CB3: Area to CB#3 Tc=5.0 min CN=87 Runoff=0.61 cfs 1,889 cf Runoff Area=5,869 sf 100.00% Impervious Runoff Depth>3.03"Subcatchment To DI#1: Area to DI#1 Tc=5.0 min CN=98 Runoff=0.43 cfs 1,480 cf Peak Elev=55.00' Storage=0 cf Inflow=0.00 cfs 0 cfPond 6P: PRO depression north Outflow=0.00 cfs 0 cf Peak Elev=48.97' Storage=414 cf Inflow=0.60 cfs 1,861 cfPond 16: (16) MC-4500 CHAMBERS#1 Outflow=0.15 cfs 1,860 cf Peak Elev=49.23' Storage=698 cf Inflow=0.88 cfs 2,809 cfPond 20: (20) MC-4500 CHAMBERS#2 Outflow=0.18 cfs 2,807 cf Peak Elev=55.24' Storage=306 cf Inflow=0.69 cfs 2,388 cfPond Bio1: Bioretention Area #1 Outflow=0.26 cfs 2,387 cf Peak Elev=54.09' Storage=18 cf Inflow=0.07 cfs 241 cfPond Bio2: Bioretention Area #2 Outflow=0.04 cfs 241 cf Total Runoff Area = 51,374 sf Runoff Volume = 7,299 cf Average Runoff Depth = 1.70" 32.77% Pervious = 16,833 sf 67.23% Impervious = 34,541 sf Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 7HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Proposed retained north [49] Hint: Tc<2dt may require smaller dt [73] Warning: Peak may fall outside time span Runoff = 0.00 cfs @ 24.00 hrs, Volume= 0 cf, Depth> 0.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=3.26" Area (sf) CN Description 1,151 39 >75% Grass cover, Good, HSG A 1,151 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 8HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Bio#1: Area to Bio#1 [49] Hint: Tc<2dt may require smaller dt [73] Warning: Peak may fall outside time span Runoff = 0.00 cfs @ 24.00 hrs, Volume= 0 cf, Depth> 0.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=3.26" Area (sf) CN Description 4,670 39 >75% Grass cover, Good, HSG A 4,670 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 9HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Bldg: Building Roof [49] Hint: Tc<2dt may require smaller dt Runoff = 0.26 cfs @ 12.07 hrs, Volume= 908 cf, Depth> 3.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=3.26" Area (sf) CN Description 3,600 98 Unconnected roofs, HSG A 3,600 100.00% Impervious Area 3,600 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 10HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Canopy: Canopy Roof [49] Hint: Tc<2dt may require smaller dt Runoff = 0.27 cfs @ 12.07 hrs, Volume= 920 cf, Depth> 3.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=3.26" Area (sf) CN Description 3,648 98 Unconnected roofs, HSG A 3,648 100.00% Impervious Area 3,648 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 11HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Pro Abutter: Proposed runoff to abutter [49] Hint: Tc<2dt may require smaller dt [73] Warning: Peak may fall outside time span Runoff = 0.00 cfs @ 24.00 hrs, Volume= 0 cf, Depth> 0.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=3.26" Area (sf) CN Description 3,472 39 >75% Grass cover, Good, HSG A 3,472 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 12HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB1: Area to CB#1 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.60 cfs @ 12.08 hrs, Volume= 1,861 cf, Depth> 1.59" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=3.26" Area (sf) CN Description 10,308 98 Paved parking, HSG A 3,779 39 >75% Grass cover, Good, HSG A 14,087 82 Weighted Average 3,779 26.83% Pervious Area 10,308 73.17% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 13HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB2: Area to CB#2 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.07 cfs @ 12.09 hrs, Volume= 241 cf, Depth> 0.86" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=3.26" Area (sf) CN Description 1,789 98 Paved parking, HSG A 1,564 39 >75% Grass cover, Good, HSG A 3,353 70 Weighted Average 1,564 46.64% Pervious Area 1,789 53.36% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 14HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB3: Area to CB#3 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.61 cfs @ 12.08 hrs, Volume= 1,889 cf, Depth> 1.97" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=3.26" Area (sf) CN Description 9,327 98 Paved parking, HSG A 2,197 39 >75% Grass cover, Good, HSG A 11,524 87 Weighted Average 2,197 19.06% Pervious Area 9,327 80.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 15HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To DI#1: Area to DI#1 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.43 cfs @ 12.07 hrs, Volume= 1,480 cf, Depth> 3.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=3.26" Area (sf) CN Description 5,869 98 Paved parking, HSG A 5,869 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 16HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 6P: PRO depression north Inflow Area = 1,151 sf, 0.00% Impervious, Inflow Depth > 0.00" for 2-Year event Inflow = 0.00 cfs @ 24.00 hrs, Volume= 0 cf Outflow = 0.00 cfs @ 24.00 hrs, Volume= 0 cf, Atten= 0%, Lag= 0.0 min Discarded = 0.00 cfs @ 24.00 hrs, Volume= 0 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 55.00' @ 24.00 hrs Surf.Area= 91 sf Storage= 0 cf Plug-Flow detention time= 0.9 min calculated for 0 cf (99% of inflow) Center-of-Mass det. time= 0.4 min ( 1,359.0 - 1,358.7 ) Volume Invert Avail.Storage Storage Description #1 55.00' 193 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 55.00 91 0 0 56.00 294 193 193 Device Routing Invert Outlet Devices #1 Discarded 55.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.02 cfs @ 24.00 hrs HW=55.00' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.02 cfs) Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 17HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 16: (16) MC-4500 CHAMBERS#1 Inflow Area = 14,087 sf, 73.17% Impervious, Inflow Depth > 1.59" for 2-Year event Inflow = 0.60 cfs @ 12.08 hrs, Volume= 1,861 cf Outflow = 0.15 cfs @ 11.85 hrs, Volume= 1,860 cf, Atten= 76%, Lag= 0.0 min Discarded = 0.15 cfs @ 11.85 hrs, Volume= 1,860 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 48.97' @ 12.49 hrs Surf.Area= 763 sf Storage= 414 cf Plug-Flow detention time= 16.5 min calculated for 1,860 cf (100% of inflow) Center-of-Mass det. time= 16.2 min ( 850.1 - 834.0 ) Volume Invert Avail.Storage Storage Description #1A 47.92' 1,323 cf 19.42'W x 39.32'L x 6.75'H Field A 5,153 cf Overall - 1,847 cf Embedded = 3,306 cf x 40.0% Voids #2A 48.67' 1,847 cf ADS_StormTech MC-4500 +Cap x 16 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 16 Chambers in 2 Rows Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 3,169 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 47.92'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.15 cfs @ 11.85 hrs HW=47.99' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.15 cfs) Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 18HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Pond 16: (16) MC-4500 CHAMBERS#1 - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-4500 +Cap (ADS StormTech® MC-4500 with cap volume) Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 100.0" Wide + 9.0" Spacing = 109.0" C-C Row Spacing 8 Chambers/Row x 4.02' Long +2.56' Cap Length x 2 = 37.32' Row Length +12.0" End Stone x 2 = 39.32' Base Length 2 Rows x 100.0" Wide + 9.0" Spacing x 1 + 12.0" Side Stone x 2 = 19.42' Base Width 9.0" Base + 60.0" Chamber Height + 12.0" Cover = 6.75' Field Height 16 Chambers x 106.5 cf + 35.7 cf Cap Volume x 2 x 2 Rows = 1,846.6 cf Chamber Storage 5,152.9 cf Field - 1,846.6 cf Chambers = 3,306.3 cf Stone x 40.0% Voids = 1,322.5 cf Stone Storage Chamber Storage + Stone Storage = 3,169.2 cf = 0.073 af Overall Storage Efficiency = 61.5% Overall System Size = 39.32' x 19.42' x 6.75' 16 Chambers 190.8 cy Field 122.5 cy Stone Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 19HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 20: (20) MC-4500 CHAMBERS#2 Inflow Area = 15,172 sf, 85.52% Impervious, Inflow Depth > 2.22" for 2-Year event Inflow = 0.88 cfs @ 12.07 hrs, Volume= 2,809 cf Outflow = 0.18 cfs @ 11.75 hrs, Volume= 2,807 cf, Atten= 80%, Lag= 0.0 min Discarded = 0.18 cfs @ 11.75 hrs, Volume= 2,807 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 49.23' @ 12.51 hrs Surf.Area= 920 sf Storage= 698 cf Plug-Flow detention time= 22.8 min calculated for 2,807 cf (100% of inflow) Center-of-Mass det. time= 22.5 min ( 819.0 - 796.4 ) Volume Invert Avail.Storage Storage Description #1A 47.92' 1,574 cf 19.42'W x 47.37'L x 6.75'H Field A 6,208 cf Overall - 2,273 cf Embedded = 3,935 cf x 40.0% Voids #2A 48.67' 2,273 cf ADS_StormTech MC-4500 +Cap x 20 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.02'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 20 Chambers in 2 Rows Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 3,847 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 47.92'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.18 cfs @ 11.75 hrs HW=47.99' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.18 cfs) Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 20HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Pond 20: (20) MC-4500 CHAMBERS#2 - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-4500 +Cap (ADS StormTech® MC-4500 with cap volume) Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.02'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 100.0" Wide + 9.0" Spacing = 109.0" C-C Row Spacing 10 Chambers/Row x 4.02' Long +2.56' Cap Length x 2 = 45.37' Row Length +12.0" End Stone x 2 = 47.37' Base Length 2 Rows x 100.0" Wide + 9.0" Spacing x 1 + 12.0" Side Stone x 2 = 19.42' Base Width 9.0" Base + 60.0" Chamber Height + 12.0" Cover = 6.75' Field Height 20 Chambers x 106.5 cf + 35.7 cf Cap Volume x 2 x 2 Rows = 2,272.6 cf Chamber Storage 6,208.0 cf Field - 2,272.6 cf Chambers = 3,935.4 cf Stone x 40.0% Voids = 1,574.2 cf Stone Storage Chamber Storage + Stone Storage = 3,846.8 cf = 0.088 af Overall Storage Efficiency = 62.0% Overall System Size = 47.37' x 19.42' x 6.75' 20 Chambers 229.9 cy Field 145.8 cy Stone Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 21HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond Bio1: Bioretention Area #1 Inflow Area = 14,139 sf, 66.97% Impervious, Inflow Depth > 2.03" for 2-Year event Inflow = 0.69 cfs @ 12.07 hrs, Volume= 2,388 cf Outflow = 0.26 cfs @ 12.30 hrs, Volume= 2,387 cf, Atten= 62%, Lag= 13.5 min Discarded = 0.26 cfs @ 12.30 hrs, Volume= 2,387 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 55.24' @ 12.30 hrs Surf.Area= 1,372 sf Storage= 306 cf Plug-Flow detention time= 5.8 min calculated for 2,382 cf (100% of inflow) Center-of-Mass det. time= 5.7 min ( 760.5 - 754.9 ) Volume Invert Avail.Storage Storage Description #1 55.00' 3,806 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 55.00 1,216 0 0 56.00 1,877 1,547 1,547 57.00 2,642 2,260 3,806 Device Routing Invert Outlet Devices #1 Discarded 55.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.26 cfs @ 12.30 hrs HW=55.24' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.26 cfs) Type III 24-hr 2-Year Rainfall=3.26"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 22HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond Bio2: Bioretention Area #2 Inflow Area = 3,353 sf, 53.36% Impervious, Inflow Depth > 0.86" for 2-Year event Inflow = 0.07 cfs @ 12.09 hrs, Volume= 241 cf Outflow = 0.04 cfs @ 12.24 hrs, Volume= 241 cf, Atten= 43%, Lag= 9.1 min Discarded = 0.04 cfs @ 12.24 hrs, Volume= 241 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 54.09' @ 12.24 hrs Surf.Area= 212 sf Storage= 18 cf Plug-Flow detention time= 3.3 min calculated for 240 cf (100% of inflow) Center-of-Mass det. time= 2.9 min ( 875.8 - 872.9 ) Volume Invert Avail.Storage Storage Description #1 54.00' 1,301 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 54.00 191 0 0 55.00 424 308 308 56.00 737 581 888 56.50 916 413 1,301 Device Routing Invert Outlet Devices #1 Discarded 54.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.04 cfs @ 12.24 hrs HW=54.09' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 23HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1,151 sf 0.00% Impervious Runoff Depth>0.15"Subcatchment 5S: Proposed retained north Tc=5.0 min CN=39 Runoff=0.00 cfs 14 cf Runoff Area=4,670 sf 0.00% Impervious Runoff Depth>0.15"Subcatchment Bio#1: Area to Bio#1 Tc=5.0 min CN=39 Runoff=0.00 cfs 58 cf Runoff Area=3,600 sf 100.00% Impervious Runoff Depth>4.50"Subcatchment Bldg: Building Roof Tc=5.0 min CN=98 Runoff=0.39 cfs 1,350 cf Runoff Area=3,648 sf 100.00% Impervious Runoff Depth>4.50"Subcatchment Canopy: Canopy Roof Tc=5.0 min CN=98 Runoff=0.39 cfs 1,368 cf Runoff Area=3,472 sf 0.00% Impervious Runoff Depth>0.15"Subcatchment Pro Abutter: Proposed runoff Tc=5.0 min CN=39 Runoff=0.00 cfs 43 cf Runoff Area=14,087 sf 73.17% Impervious Runoff Depth>2.85"Subcatchment To CB1: Area to CB#1 Tc=5.0 min CN=82 Runoff=1.08 cfs 3,341 cf Runoff Area=3,353 sf 53.36% Impervious Runoff Depth>1.84"Subcatchment To CB2: Area to CB#2 Tc=5.0 min CN=70 Runoff=0.16 cfs 515 cf Runoff Area=11,524 sf 80.94% Impervious Runoff Depth>3.32"Subcatchment To CB3: Area to CB#3 Tc=5.0 min CN=87 Runoff=1.02 cfs 3,189 cf Runoff Area=5,869 sf 100.00% Impervious Runoff Depth>4.50"Subcatchment To DI#1: Area to DI#1 Tc=5.0 min CN=98 Runoff=0.63 cfs 2,202 cf Peak Elev=55.00' Storage=0 cf Inflow=0.00 cfs 14 cfPond 6P: PRO depression north Outflow=0.00 cfs 14 cf Peak Elev=50.05' Storage=1,072 cf Inflow=1.08 cfs 3,341 cfPond 16: (16) MC-4500 CHAMBERS#1 Outflow=0.15 cfs 3,339 cf Peak Elev=50.27' Storage=1,456 cf Inflow=1.41 cfs 4,558 cfPond 20: (20) MC-4500 CHAMBERS#2 Outflow=0.18 cfs 4,556 cf Peak Elev=55.47' Storage=645 cf Inflow=1.01 cfs 3,610 cfPond Bio1: Bioretention Area #1 Outflow=0.29 cfs 3,609 cf Peak Elev=54.40' Storage=95 cf Inflow=0.16 cfs 515 cfPond Bio2: Bioretention Area #2 Outflow=0.05 cfs 515 cf Total Runoff Area = 51,374 sf Runoff Volume = 12,082 cf Average Runoff Depth = 2.82" 32.77% Pervious = 16,833 sf 67.23% Impervious = 34,541 sf Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 24HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Proposed retained north [49] Hint: Tc<2dt may require smaller dt Runoff = 0.00 cfs @ 13.71 hrs, Volume= 14 cf, Depth> 0.15" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.74" Area (sf) CN Description 1,151 39 >75% Grass cover, Good, HSG A 1,151 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 25HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Bio#1: Area to Bio#1 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.00 cfs @ 13.71 hrs, Volume= 58 cf, Depth> 0.15" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.74" Area (sf) CN Description 4,670 39 >75% Grass cover, Good, HSG A 4,670 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 26HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Bldg: Building Roof [49] Hint: Tc<2dt may require smaller dt Runoff = 0.39 cfs @ 12.07 hrs, Volume= 1,350 cf, Depth> 4.50" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.74" Area (sf) CN Description 3,600 98 Unconnected roofs, HSG A 3,600 100.00% Impervious Area 3,600 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 27HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Canopy: Canopy Roof [49] Hint: Tc<2dt may require smaller dt Runoff = 0.39 cfs @ 12.07 hrs, Volume= 1,368 cf, Depth> 4.50" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.74" Area (sf) CN Description 3,648 98 Unconnected roofs, HSG A 3,648 100.00% Impervious Area 3,648 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 28HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Pro Abutter: Proposed runoff to abutter [49] Hint: Tc<2dt may require smaller dt Runoff = 0.00 cfs @ 13.71 hrs, Volume= 43 cf, Depth> 0.15" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.74" Area (sf) CN Description 3,472 39 >75% Grass cover, Good, HSG A 3,472 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 29HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB1: Area to CB#1 [49] Hint: Tc<2dt may require smaller dt Runoff = 1.08 cfs @ 12.08 hrs, Volume= 3,341 cf, Depth> 2.85" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.74" Area (sf) CN Description 10,308 98 Paved parking, HSG A 3,779 39 >75% Grass cover, Good, HSG A 14,087 82 Weighted Average 3,779 26.83% Pervious Area 10,308 73.17% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 30HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB2: Area to CB#2 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.16 cfs @ 12.08 hrs, Volume= 515 cf, Depth> 1.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.74" Area (sf) CN Description 1,789 98 Paved parking, HSG A 1,564 39 >75% Grass cover, Good, HSG A 3,353 70 Weighted Average 1,564 46.64% Pervious Area 1,789 53.36% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 31HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB3: Area to CB#3 [49] Hint: Tc<2dt may require smaller dt Runoff = 1.02 cfs @ 12.07 hrs, Volume= 3,189 cf, Depth> 3.32" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.74" Area (sf) CN Description 9,327 98 Paved parking, HSG A 2,197 39 >75% Grass cover, Good, HSG A 11,524 87 Weighted Average 2,197 19.06% Pervious Area 9,327 80.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 32HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To DI#1: Area to DI#1 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.63 cfs @ 12.07 hrs, Volume= 2,202 cf, Depth> 4.50" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.74" Area (sf) CN Description 5,869 98 Paved parking, HSG A 5,869 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 33HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 6P: PRO depression north Inflow Area = 1,151 sf, 0.00% Impervious, Inflow Depth > 0.15" for 10-Year event Inflow = 0.00 cfs @ 13.71 hrs, Volume= 14 cf Outflow = 0.00 cfs @ 13.72 hrs, Volume= 14 cf, Atten= 0%, Lag= 0.8 min Discarded = 0.00 cfs @ 13.72 hrs, Volume= 14 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 55.00' @ 13.72 hrs Surf.Area= 91 sf Storage= 0 cf Plug-Flow detention time= 0.9 min calculated for 14 cf (100% of inflow) Center-of-Mass det. time= 0.6 min ( 1,029.3 - 1,028.7 ) Volume Invert Avail.Storage Storage Description #1 55.00' 193 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 55.00 91 0 0 56.00 294 193 193 Device Routing Invert Outlet Devices #1 Discarded 55.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.02 cfs @ 13.72 hrs HW=55.00' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.02 cfs) Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 34HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 16: (16) MC-4500 CHAMBERS#1 Inflow Area = 14,087 sf, 73.17% Impervious, Inflow Depth > 2.85" for 10-Year event Inflow = 1.08 cfs @ 12.08 hrs, Volume= 3,341 cf Outflow = 0.15 cfs @ 11.70 hrs, Volume= 3,339 cf, Atten= 86%, Lag= 0.0 min Discarded = 0.15 cfs @ 11.70 hrs, Volume= 3,339 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 50.05' @ 12.64 hrs Surf.Area= 763 sf Storage= 1,072 cf Plug-Flow detention time= 52.3 min calculated for 3,339 cf (100% of inflow) Center-of-Mass det. time= 52.0 min ( 869.2 - 817.2 ) Volume Invert Avail.Storage Storage Description #1A 47.92' 1,323 cf 19.42'W x 39.32'L x 6.75'H Field A 5,153 cf Overall - 1,847 cf Embedded = 3,306 cf x 40.0% Voids #2A 48.67' 1,847 cf ADS_StormTech MC-4500 +Cap x 16 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 16 Chambers in 2 Rows Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 3,169 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 47.92'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.15 cfs @ 11.70 hrs HW=48.00' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.15 cfs) Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 35HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Pond 16: (16) MC-4500 CHAMBERS#1 - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-4500 +Cap (ADS StormTech® MC-4500 with cap volume) Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 100.0" Wide + 9.0" Spacing = 109.0" C-C Row Spacing 8 Chambers/Row x 4.02' Long +2.56' Cap Length x 2 = 37.32' Row Length +12.0" End Stone x 2 = 39.32' Base Length 2 Rows x 100.0" Wide + 9.0" Spacing x 1 + 12.0" Side Stone x 2 = 19.42' Base Width 9.0" Base + 60.0" Chamber Height + 12.0" Cover = 6.75' Field Height 16 Chambers x 106.5 cf + 35.7 cf Cap Volume x 2 x 2 Rows = 1,846.6 cf Chamber Storage 5,152.9 cf Field - 1,846.6 cf Chambers = 3,306.3 cf Stone x 40.0% Voids = 1,322.5 cf Stone Storage Chamber Storage + Stone Storage = 3,169.2 cf = 0.073 af Overall Storage Efficiency = 61.5% Overall System Size = 39.32' x 19.42' x 6.75' 16 Chambers 190.8 cy Field 122.5 cy Stone Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 36HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 20: (20) MC-4500 CHAMBERS#2 Inflow Area = 15,172 sf, 85.52% Impervious, Inflow Depth > 3.60" for 10-Year event Inflow = 1.41 cfs @ 12.07 hrs, Volume= 4,558 cf Outflow = 0.18 cfs @ 11.65 hrs, Volume= 4,556 cf, Atten= 88%, Lag= 0.0 min Discarded = 0.18 cfs @ 11.65 hrs, Volume= 4,556 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 50.27' @ 12.65 hrs Surf.Area= 920 sf Storage= 1,456 cf Plug-Flow detention time= 55.9 min calculated for 4,556 cf (100% of inflow) Center-of-Mass det. time= 55.6 min ( 841.3 - 785.6 ) Volume Invert Avail.Storage Storage Description #1A 47.92' 1,574 cf 19.42'W x 47.37'L x 6.75'H Field A 6,208 cf Overall - 2,273 cf Embedded = 3,935 cf x 40.0% Voids #2A 48.67' 2,273 cf ADS_StormTech MC-4500 +Cap x 20 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.02'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 20 Chambers in 2 Rows Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 3,847 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 47.92'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.18 cfs @ 11.65 hrs HW=48.00' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.18 cfs) Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 37HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Pond 20: (20) MC-4500 CHAMBERS#2 - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-4500 +Cap (ADS StormTech® MC-4500 with cap volume) Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.02'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 100.0" Wide + 9.0" Spacing = 109.0" C-C Row Spacing 10 Chambers/Row x 4.02' Long +2.56' Cap Length x 2 = 45.37' Row Length +12.0" End Stone x 2 = 47.37' Base Length 2 Rows x 100.0" Wide + 9.0" Spacing x 1 + 12.0" Side Stone x 2 = 19.42' Base Width 9.0" Base + 60.0" Chamber Height + 12.0" Cover = 6.75' Field Height 20 Chambers x 106.5 cf + 35.7 cf Cap Volume x 2 x 2 Rows = 2,272.6 cf Chamber Storage 6,208.0 cf Field - 2,272.6 cf Chambers = 3,935.4 cf Stone x 40.0% Voids = 1,574.2 cf Stone Storage Chamber Storage + Stone Storage = 3,846.8 cf = 0.088 af Overall Storage Efficiency = 62.0% Overall System Size = 47.37' x 19.42' x 6.75' 20 Chambers 229.9 cy Field 145.8 cy Stone Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 38HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond Bio1: Bioretention Area #1 Inflow Area = 14,139 sf, 66.97% Impervious, Inflow Depth > 3.06" for 10-Year event Inflow = 1.01 cfs @ 12.07 hrs, Volume= 3,610 cf Outflow = 0.29 cfs @ 12.39 hrs, Volume= 3,609 cf, Atten= 71%, Lag= 19.3 min Discarded = 0.29 cfs @ 12.39 hrs, Volume= 3,609 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 55.47' @ 12.39 hrs Surf.Area= 1,527 sf Storage= 645 cf Plug-Flow detention time= 11.2 min calculated for 3,609 cf (100% of inflow) Center-of-Mass det. time= 11.0 min ( 763.2 - 752.2 ) Volume Invert Avail.Storage Storage Description #1 55.00' 3,806 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 55.00 1,216 0 0 56.00 1,877 1,547 1,547 57.00 2,642 2,260 3,806 Device Routing Invert Outlet Devices #1 Discarded 55.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.29 cfs @ 12.39 hrs HW=55.47' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.29 cfs) Type III 24-hr 10-Year Rainfall=4.74"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 39HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond Bio2: Bioretention Area #2 Inflow Area = 3,353 sf, 53.36% Impervious, Inflow Depth > 1.84" for 10-Year event Inflow = 0.16 cfs @ 12.08 hrs, Volume= 515 cf Outflow = 0.05 cfs @ 12.42 hrs, Volume= 515 cf, Atten= 67%, Lag= 20.3 min Discarded = 0.05 cfs @ 12.42 hrs, Volume= 515 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 54.40' @ 12.42 hrs Surf.Area= 285 sf Storage= 95 cf Plug-Flow detention time= 11.0 min calculated for 515 cf (100% of inflow) Center-of-Mass det. time= 10.7 min ( 859.8 - 849.2 ) Volume Invert Avail.Storage Storage Description #1 54.00' 1,301 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 54.00 191 0 0 55.00 424 308 308 56.00 737 581 888 56.50 916 413 1,301 Device Routing Invert Outlet Devices #1 Discarded 54.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.05 cfs @ 12.42 hrs HW=54.40' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.05 cfs) Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 40HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1,151 sf 0.00% Impervious Runoff Depth>0.41"Subcatchment 5S: Proposed retained north Tc=5.0 min CN=39 Runoff=0.00 cfs 39 cf Runoff Area=4,670 sf 0.00% Impervious Runoff Depth>0.41"Subcatchment Bio#1: Area to Bio#1 Tc=5.0 min CN=39 Runoff=0.02 cfs 160 cf Runoff Area=3,600 sf 100.00% Impervious Runoff Depth>5.64"Subcatchment Bldg: Building Roof Tc=5.0 min CN=98 Runoff=0.48 cfs 1,692 cf Runoff Area=3,648 sf 100.00% Impervious Runoff Depth>5.64"Subcatchment Canopy: Canopy Roof Tc=5.0 min CN=98 Runoff=0.49 cfs 1,714 cf Runoff Area=3,472 sf 0.00% Impervious Runoff Depth>0.41"Subcatchment Pro Abutter: Proposed runoff Tc=5.0 min CN=39 Runoff=0.01 cfs 119 cf Runoff Area=14,087 sf 73.17% Impervious Runoff Depth>3.87"Subcatchment To CB1: Area to CB#1 Tc=5.0 min CN=82 Runoff=1.47 cfs 4,548 cf Runoff Area=3,353 sf 53.36% Impervious Runoff Depth>2.71"Subcatchment To CB2: Area to CB#2 Tc=5.0 min CN=70 Runoff=0.24 cfs 757 cf Runoff Area=11,524 sf 80.94% Impervious Runoff Depth>4.40"Subcatchment To CB3: Area to CB#3 Tc=5.0 min CN=87 Runoff=1.34 cfs 4,225 cf Runoff Area=5,869 sf 100.00% Impervious Runoff Depth>5.64"Subcatchment To DI#1: Area to DI#1 Tc=5.0 min CN=98 Runoff=0.78 cfs 2,758 cf Peak Elev=55.00' Storage=0 cf Inflow=0.00 cfs 39 cfPond 6P: PRO depression north Outflow=0.00 cfs 39 cf Peak Elev=51.07' Storage=1,660 cf Inflow=1.47 cfs 4,548 cfPond 16: (16) MC-4500 CHAMBERS#1 Outflow=0.15 cfs 4,546 cf Peak Elev=51.19' Storage=2,100 cf Inflow=1.82 cfs 5,940 cfPond 20: (20) MC-4500 CHAMBERS#2 Outflow=0.18 cfs 5,937 cf Peak Elev=55.66' Storage=950 cf Inflow=1.26 cfs 4,610 cfPond Bio1: Bioretention Area #1 Outflow=0.32 cfs 4,609 cf Peak Elev=54.67' Storage=179 cf Inflow=0.24 cfs 757 cfPond Bio2: Bioretention Area #2 Outflow=0.07 cfs 756 cf Total Runoff Area = 51,374 sf Runoff Volume = 16,013 cf Average Runoff Depth = 3.74" 32.77% Pervious = 16,833 sf 67.23% Impervious = 34,541 sf Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 41HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Proposed retained north [49] Hint: Tc<2dt may require smaller dt Runoff = 0.00 cfs @ 12.34 hrs, Volume= 39 cf, Depth> 0.41" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 25-Year Rainfall=5.88" Area (sf) CN Description 1,151 39 >75% Grass cover, Good, HSG A 1,151 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 42HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Bio#1: Area to Bio#1 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.02 cfs @ 12.34 hrs, Volume= 160 cf, Depth> 0.41" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 25-Year Rainfall=5.88" Area (sf) CN Description 4,670 39 >75% Grass cover, Good, HSG A 4,670 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 43HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Bldg: Building Roof [49] Hint: Tc<2dt may require smaller dt Runoff = 0.48 cfs @ 12.07 hrs, Volume= 1,692 cf, Depth> 5.64" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 25-Year Rainfall=5.88" Area (sf) CN Description 3,600 98 Unconnected roofs, HSG A 3,600 100.00% Impervious Area 3,600 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 44HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Canopy: Canopy Roof [49] Hint: Tc<2dt may require smaller dt Runoff = 0.49 cfs @ 12.07 hrs, Volume= 1,714 cf, Depth> 5.64" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 25-Year Rainfall=5.88" Area (sf) CN Description 3,648 98 Unconnected roofs, HSG A 3,648 100.00% Impervious Area 3,648 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 45HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Pro Abutter: Proposed runoff to abutter [49] Hint: Tc<2dt may require smaller dt Runoff = 0.01 cfs @ 12.34 hrs, Volume= 119 cf, Depth> 0.41" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 25-Year Rainfall=5.88" Area (sf) CN Description 3,472 39 >75% Grass cover, Good, HSG A 3,472 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 46HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB1: Area to CB#1 [49] Hint: Tc<2dt may require smaller dt Runoff = 1.47 cfs @ 12.07 hrs, Volume= 4,548 cf, Depth> 3.87" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 25-Year Rainfall=5.88" Area (sf) CN Description 10,308 98 Paved parking, HSG A 3,779 39 >75% Grass cover, Good, HSG A 14,087 82 Weighted Average 3,779 26.83% Pervious Area 10,308 73.17% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 47HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB2: Area to CB#2 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.24 cfs @ 12.08 hrs, Volume= 757 cf, Depth> 2.71" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 25-Year Rainfall=5.88" Area (sf) CN Description 1,789 98 Paved parking, HSG A 1,564 39 >75% Grass cover, Good, HSG A 3,353 70 Weighted Average 1,564 46.64% Pervious Area 1,789 53.36% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 48HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB3: Area to CB#3 [49] Hint: Tc<2dt may require smaller dt Runoff = 1.34 cfs @ 12.07 hrs, Volume= 4,225 cf, Depth> 4.40" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 25-Year Rainfall=5.88" Area (sf) CN Description 9,327 98 Paved parking, HSG A 2,197 39 >75% Grass cover, Good, HSG A 11,524 87 Weighted Average 2,197 19.06% Pervious Area 9,327 80.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 49HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To DI#1: Area to DI#1 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.78 cfs @ 12.07 hrs, Volume= 2,758 cf, Depth> 5.64" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 25-Year Rainfall=5.88" Area (sf) CN Description 5,869 98 Paved parking, HSG A 5,869 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 50HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 6P: PRO depression north Inflow Area = 1,151 sf, 0.00% Impervious, Inflow Depth > 0.41" for 25-Year event Inflow = 0.00 cfs @ 12.34 hrs, Volume= 39 cf Outflow = 0.00 cfs @ 12.36 hrs, Volume= 39 cf, Atten= 0%, Lag= 0.9 min Discarded = 0.00 cfs @ 12.36 hrs, Volume= 39 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 55.00' @ 12.36 hrs Surf.Area= 91 sf Storage= 0 cf Plug-Flow detention time= 0.9 min calculated for 39 cf (100% of inflow) Center-of-Mass det. time= 0.6 min ( 962.9 - 962.3 ) Volume Invert Avail.Storage Storage Description #1 55.00' 193 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 55.00 91 0 0 56.00 294 193 193 Device Routing Invert Outlet Devices #1 Discarded 55.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.02 cfs @ 12.36 hrs HW=55.00' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.02 cfs) Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 51HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 16: (16) MC-4500 CHAMBERS#1 Inflow Area = 14,087 sf, 73.17% Impervious, Inflow Depth > 3.87" for 25-Year event Inflow = 1.47 cfs @ 12.07 hrs, Volume= 4,548 cf Outflow = 0.15 cfs @ 11.60 hrs, Volume= 4,546 cf, Atten= 90%, Lag= 0.0 min Discarded = 0.15 cfs @ 11.60 hrs, Volume= 4,546 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 51.07' @ 12.92 hrs Surf.Area= 763 sf Storage= 1,660 cf Plug-Flow detention time= 89.1 min calculated for 4,546 cf (100% of inflow) Center-of-Mass det. time= 88.8 min ( 897.2 - 808.4 ) Volume Invert Avail.Storage Storage Description #1A 47.92' 1,323 cf 19.42'W x 39.32'L x 6.75'H Field A 5,153 cf Overall - 1,847 cf Embedded = 3,306 cf x 40.0% Voids #2A 48.67' 1,847 cf ADS_StormTech MC-4500 +Cap x 16 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 16 Chambers in 2 Rows Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 3,169 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 47.92'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.15 cfs @ 11.60 hrs HW=47.99' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.15 cfs) Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 52HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Pond 16: (16) MC-4500 CHAMBERS#1 - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-4500 +Cap (ADS StormTech® MC-4500 with cap volume) Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 100.0" Wide + 9.0" Spacing = 109.0" C-C Row Spacing 8 Chambers/Row x 4.02' Long +2.56' Cap Length x 2 = 37.32' Row Length +12.0" End Stone x 2 = 39.32' Base Length 2 Rows x 100.0" Wide + 9.0" Spacing x 1 + 12.0" Side Stone x 2 = 19.42' Base Width 9.0" Base + 60.0" Chamber Height + 12.0" Cover = 6.75' Field Height 16 Chambers x 106.5 cf + 35.7 cf Cap Volume x 2 x 2 Rows = 1,846.6 cf Chamber Storage 5,152.9 cf Field - 1,846.6 cf Chambers = 3,306.3 cf Stone x 40.0% Voids = 1,322.5 cf Stone Storage Chamber Storage + Stone Storage = 3,169.2 cf = 0.073 af Overall Storage Efficiency = 61.5% Overall System Size = 39.32' x 19.42' x 6.75' 16 Chambers 190.8 cy Field 122.5 cy Stone Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 53HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 20: (20) MC-4500 CHAMBERS#2 Inflow Area = 15,172 sf, 85.52% Impervious, Inflow Depth > 4.70" for 25-Year event Inflow = 1.82 cfs @ 12.07 hrs, Volume= 5,940 cf Outflow = 0.18 cfs @ 11.50 hrs, Volume= 5,937 cf, Atten= 90%, Lag= 0.0 min Discarded = 0.18 cfs @ 11.50 hrs, Volume= 5,937 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 51.19' @ 12.89 hrs Surf.Area= 920 sf Storage= 2,100 cf Plug-Flow detention time= 87.1 min calculated for 5,937 cf (100% of inflow) Center-of-Mass det. time= 86.8 min ( 866.5 - 779.7 ) Volume Invert Avail.Storage Storage Description #1A 47.92' 1,574 cf 19.42'W x 47.37'L x 6.75'H Field A 6,208 cf Overall - 2,273 cf Embedded = 3,935 cf x 40.0% Voids #2A 48.67' 2,273 cf ADS_StormTech MC-4500 +Cap x 20 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.02'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 20 Chambers in 2 Rows Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 3,847 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 47.92'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.18 cfs @ 11.50 hrs HW=47.99' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.18 cfs) Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 54HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Pond 20: (20) MC-4500 CHAMBERS#2 - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-4500 +Cap (ADS StormTech® MC-4500 with cap volume) Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.02'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 100.0" Wide + 9.0" Spacing = 109.0" C-C Row Spacing 10 Chambers/Row x 4.02' Long +2.56' Cap Length x 2 = 45.37' Row Length +12.0" End Stone x 2 = 47.37' Base Length 2 Rows x 100.0" Wide + 9.0" Spacing x 1 + 12.0" Side Stone x 2 = 19.42' Base Width 9.0" Base + 60.0" Chamber Height + 12.0" Cover = 6.75' Field Height 20 Chambers x 106.5 cf + 35.7 cf Cap Volume x 2 x 2 Rows = 2,272.6 cf Chamber Storage 6,208.0 cf Field - 2,272.6 cf Chambers = 3,935.4 cf Stone x 40.0% Voids = 1,574.2 cf Stone Storage Chamber Storage + Stone Storage = 3,846.8 cf = 0.088 af Overall Storage Efficiency = 62.0% Overall System Size = 47.37' x 19.42' x 6.75' 20 Chambers 229.9 cy Field 145.8 cy Stone Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 55HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond Bio1: Bioretention Area #1 Inflow Area = 14,139 sf, 66.97% Impervious, Inflow Depth > 3.91" for 25-Year event Inflow = 1.26 cfs @ 12.07 hrs, Volume= 4,610 cf Outflow = 0.32 cfs @ 12.45 hrs, Volume= 4,609 cf, Atten= 75%, Lag= 22.5 min Discarded = 0.32 cfs @ 12.45 hrs, Volume= 4,609 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 55.66' @ 12.45 hrs Surf.Area= 1,654 sf Storage= 950 cf Plug-Flow detention time= 16.1 min calculated for 4,609 cf (100% of inflow) Center-of-Mass det. time= 15.9 min ( 767.7 - 751.8 ) Volume Invert Avail.Storage Storage Description #1 55.00' 3,806 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 55.00 1,216 0 0 56.00 1,877 1,547 1,547 57.00 2,642 2,260 3,806 Device Routing Invert Outlet Devices #1 Discarded 55.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.32 cfs @ 12.45 hrs HW=55.66' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.32 cfs) Type III 24-hr 25-Year Rainfall=5.88"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 56HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond Bio2: Bioretention Area #2 Inflow Area = 3,353 sf, 53.36% Impervious, Inflow Depth > 2.71" for 25-Year event Inflow = 0.24 cfs @ 12.08 hrs, Volume= 757 cf Outflow = 0.07 cfs @ 12.47 hrs, Volume= 756 cf, Atten= 73%, Lag= 23.1 min Discarded = 0.07 cfs @ 12.47 hrs, Volume= 756 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 54.67' @ 12.47 hrs Surf.Area= 346 sf Storage= 179 cf Plug-Flow detention time= 18.6 min calculated for 755 cf (100% of inflow) Center-of-Mass det. time= 18.3 min ( 856.1 - 837.9 ) Volume Invert Avail.Storage Storage Description #1 54.00' 1,301 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 54.00 191 0 0 55.00 424 308 308 56.00 737 581 888 56.50 916 413 1,301 Device Routing Invert Outlet Devices #1 Discarded 54.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.07 cfs @ 12.47 hrs HW=54.67' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.07 cfs) Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 57HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1,151 sf 0.00% Impervious Runoff Depth>0.76"Subcatchment 5S: Proposed retained north Tc=5.0 min CN=39 Runoff=0.01 cfs 73 cf Runoff Area=4,670 sf 0.00% Impervious Runoff Depth>0.76"Subcatchment Bio#1: Area to Bio#1 Tc=5.0 min CN=39 Runoff=0.04 cfs 294 cf Runoff Area=3,600 sf 100.00% Impervious Runoff Depth>6.73"Subcatchment Bldg: Building Roof Tc=5.0 min CN=98 Runoff=0.57 cfs 2,018 cf Runoff Area=3,648 sf 100.00% Impervious Runoff Depth>6.73"Subcatchment Canopy: Canopy Roof Tc=5.0 min CN=98 Runoff=0.58 cfs 2,045 cf Runoff Area=3,472 sf 0.00% Impervious Runoff Depth>0.76"Subcatchment Pro Abutter: Proposed runoff Tc=5.0 min CN=39 Runoff=0.03 cfs 219 cf Runoff Area=14,087 sf 73.17% Impervious Runoff Depth>4.89"Subcatchment To CB1: Area to CB#1 Tc=5.0 min CN=82 Runoff=1.83 cfs 5,735 cf Runoff Area=3,353 sf 53.36% Impervious Runoff Depth>3.59"Subcatchment To CB2: Area to CB#2 Tc=5.0 min CN=70 Runoff=0.32 cfs 1,003 cf Runoff Area=11,524 sf 80.94% Impervious Runoff Depth>5.45"Subcatchment To CB3: Area to CB#3 Tc=5.0 min CN=87 Runoff=1.64 cfs 5,231 cf Runoff Area=5,869 sf 100.00% Impervious Runoff Depth>6.73"Subcatchment To DI#1: Area to DI#1 Tc=5.0 min CN=98 Runoff=0.93 cfs 3,290 cf Peak Elev=55.01' Storage=1 cf Inflow=0.01 cfs 73 cfPond 6P: PRO depression north Outflow=0.01 cfs 73 cf Peak Elev=52.23' Storage=2,277 cf Inflow=1.83 cfs 5,735 cfPond 16: (16) MC-4500 CHAMBERS#1 Outflow=0.15 cfs 5,732 cf Peak Elev=52.23' Storage=2,772 cf Inflow=2.21 cfs 7,277 cfPond 20: (20) MC-4500 CHAMBERS#2 Outflow=0.18 cfs 7,274 cf Peak Elev=55.85' Storage=1,278 cf Inflow=1.53 cfs 5,603 cfPond Bio1: Bioretention Area #1 Outflow=0.34 cfs 5,602 cf Peak Elev=54.91' Storage=270 cf Inflow=0.32 cfs 1,003 cfPond Bio2: Bioretention Area #2 Outflow=0.08 cfs 1,003 cf Total Runoff Area = 51,374 sf Runoff Volume = 19,909 cf Average Runoff Depth = 4.65" 32.77% Pervious = 16,833 sf 67.23% Impervious = 34,541 sf Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 58HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Proposed retained north [49] Hint: Tc<2dt may require smaller dt Runoff = 0.01 cfs @ 12.14 hrs, Volume= 73 cf, Depth> 0.76" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 50-Year Rainfall=6.97" Area (sf) CN Description 1,151 39 >75% Grass cover, Good, HSG A 1,151 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 59HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Bio#1: Area to Bio#1 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.04 cfs @ 12.14 hrs, Volume= 294 cf, Depth> 0.76" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 50-Year Rainfall=6.97" Area (sf) CN Description 4,670 39 >75% Grass cover, Good, HSG A 4,670 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 60HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Bldg: Building Roof [49] Hint: Tc<2dt may require smaller dt Runoff = 0.57 cfs @ 12.07 hrs, Volume= 2,018 cf, Depth> 6.73" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 50-Year Rainfall=6.97" Area (sf) CN Description 3,600 98 Unconnected roofs, HSG A 3,600 100.00% Impervious Area 3,600 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 61HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Canopy: Canopy Roof [49] Hint: Tc<2dt may require smaller dt Runoff = 0.58 cfs @ 12.07 hrs, Volume= 2,045 cf, Depth> 6.73" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 50-Year Rainfall=6.97" Area (sf) CN Description 3,648 98 Unconnected roofs, HSG A 3,648 100.00% Impervious Area 3,648 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 62HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Pro Abutter: Proposed runoff to abutter [49] Hint: Tc<2dt may require smaller dt Runoff = 0.03 cfs @ 12.14 hrs, Volume= 219 cf, Depth> 0.76" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 50-Year Rainfall=6.97" Area (sf) CN Description 3,472 39 >75% Grass cover, Good, HSG A 3,472 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 63HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB1: Area to CB#1 [49] Hint: Tc<2dt may require smaller dt Runoff = 1.83 cfs @ 12.07 hrs, Volume= 5,735 cf, Depth> 4.89" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 50-Year Rainfall=6.97" Area (sf) CN Description 10,308 98 Paved parking, HSG A 3,779 39 >75% Grass cover, Good, HSG A 14,087 82 Weighted Average 3,779 26.83% Pervious Area 10,308 73.17% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 64HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB2: Area to CB#2 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.32 cfs @ 12.08 hrs, Volume= 1,003 cf, Depth> 3.59" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 50-Year Rainfall=6.97" Area (sf) CN Description 1,789 98 Paved parking, HSG A 1,564 39 >75% Grass cover, Good, HSG A 3,353 70 Weighted Average 1,564 46.64% Pervious Area 1,789 53.36% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 65HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB3: Area to CB#3 [49] Hint: Tc<2dt may require smaller dt Runoff = 1.64 cfs @ 12.07 hrs, Volume= 5,231 cf, Depth> 5.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 50-Year Rainfall=6.97" Area (sf) CN Description 9,327 98 Paved parking, HSG A 2,197 39 >75% Grass cover, Good, HSG A 11,524 87 Weighted Average 2,197 19.06% Pervious Area 9,327 80.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 66HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To DI#1: Area to DI#1 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.93 cfs @ 12.07 hrs, Volume= 3,290 cf, Depth> 6.73" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 50-Year Rainfall=6.97" Area (sf) CN Description 5,869 98 Paved parking, HSG A 5,869 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 67HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 6P: PRO depression north Inflow Area = 1,151 sf, 0.00% Impervious, Inflow Depth > 0.76" for 50-Year event Inflow = 0.01 cfs @ 12.14 hrs, Volume= 73 cf Outflow = 0.01 cfs @ 12.16 hrs, Volume= 73 cf, Atten= 0%, Lag= 1.1 min Discarded = 0.01 cfs @ 12.16 hrs, Volume= 73 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 55.01' @ 12.16 hrs Surf.Area= 92 sf Storage= 1 cf Plug-Flow detention time= 0.9 min calculated for 72 cf (100% of inflow) Center-of-Mass det. time= 0.7 min ( 930.4 - 929.8 ) Volume Invert Avail.Storage Storage Description #1 55.00' 193 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 55.00 91 0 0 56.00 294 193 193 Device Routing Invert Outlet Devices #1 Discarded 55.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.02 cfs @ 12.16 hrs HW=55.01' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.02 cfs) Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 68HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 16: (16) MC-4500 CHAMBERS#1 Inflow Area = 14,087 sf, 73.17% Impervious, Inflow Depth > 4.89" for 50-Year event Inflow = 1.83 cfs @ 12.07 hrs, Volume= 5,735 cf Outflow = 0.15 cfs @ 11.45 hrs, Volume= 5,732 cf, Atten= 92%, Lag= 0.0 min Discarded = 0.15 cfs @ 11.45 hrs, Volume= 5,732 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 52.23' @ 13.16 hrs Surf.Area= 763 sf Storage= 2,277 cf Plug-Flow detention time= 129.4 min calculated for 5,720 cf (100% of inflow) Center-of-Mass det. time= 128.9 min ( 930.8 - 801.9 ) Volume Invert Avail.Storage Storage Description #1A 47.92' 1,323 cf 19.42'W x 39.32'L x 6.75'H Field A 5,153 cf Overall - 1,847 cf Embedded = 3,306 cf x 40.0% Voids #2A 48.67' 1,847 cf ADS_StormTech MC-4500 +Cap x 16 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 16 Chambers in 2 Rows Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 3,169 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 47.92'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.15 cfs @ 11.45 hrs HW=47.99' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.15 cfs) Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 69HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Pond 16: (16) MC-4500 CHAMBERS#1 - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-4500 +Cap (ADS StormTech® MC-4500 with cap volume) Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 100.0" Wide + 9.0" Spacing = 109.0" C-C Row Spacing 8 Chambers/Row x 4.02' Long +2.56' Cap Length x 2 = 37.32' Row Length +12.0" End Stone x 2 = 39.32' Base Length 2 Rows x 100.0" Wide + 9.0" Spacing x 1 + 12.0" Side Stone x 2 = 19.42' Base Width 9.0" Base + 60.0" Chamber Height + 12.0" Cover = 6.75' Field Height 16 Chambers x 106.5 cf + 35.7 cf Cap Volume x 2 x 2 Rows = 1,846.6 cf Chamber Storage 5,152.9 cf Field - 1,846.6 cf Chambers = 3,306.3 cf Stone x 40.0% Voids = 1,322.5 cf Stone Storage Chamber Storage + Stone Storage = 3,169.2 cf = 0.073 af Overall Storage Efficiency = 61.5% Overall System Size = 39.32' x 19.42' x 6.75' 16 Chambers 190.8 cy Field 122.5 cy Stone Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 70HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 20: (20) MC-4500 CHAMBERS#2 Inflow Area = 15,172 sf, 85.52% Impervious, Inflow Depth > 5.76" for 50-Year event Inflow = 2.21 cfs @ 12.07 hrs, Volume= 7,277 cf Outflow = 0.18 cfs @ 11.30 hrs, Volume= 7,274 cf, Atten= 92%, Lag= 0.0 min Discarded = 0.18 cfs @ 11.30 hrs, Volume= 7,274 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 52.23' @ 13.07 hrs Surf.Area= 920 sf Storage= 2,772 cf Plug-Flow detention time= 121.3 min calculated for 7,258 cf (100% of inflow) Center-of-Mass det. time= 120.8 min ( 896.0 - 775.2 ) Volume Invert Avail.Storage Storage Description #1A 47.92' 1,574 cf 19.42'W x 47.37'L x 6.75'H Field A 6,208 cf Overall - 2,273 cf Embedded = 3,935 cf x 40.0% Voids #2A 48.67' 2,273 cf ADS_StormTech MC-4500 +Cap x 20 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.02'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 20 Chambers in 2 Rows Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 3,847 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 47.92'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.18 cfs @ 11.30 hrs HW=47.99' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.18 cfs) Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 71HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Pond 20: (20) MC-4500 CHAMBERS#2 - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-4500 +Cap (ADS StormTech® MC-4500 with cap volume) Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.02'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 100.0" Wide + 9.0" Spacing = 109.0" C-C Row Spacing 10 Chambers/Row x 4.02' Long +2.56' Cap Length x 2 = 45.37' Row Length +12.0" End Stone x 2 = 47.37' Base Length 2 Rows x 100.0" Wide + 9.0" Spacing x 1 + 12.0" Side Stone x 2 = 19.42' Base Width 9.0" Base + 60.0" Chamber Height + 12.0" Cover = 6.75' Field Height 20 Chambers x 106.5 cf + 35.7 cf Cap Volume x 2 x 2 Rows = 2,272.6 cf Chamber Storage 6,208.0 cf Field - 2,272.6 cf Chambers = 3,935.4 cf Stone x 40.0% Voids = 1,574.2 cf Stone Storage Chamber Storage + Stone Storage = 3,846.8 cf = 0.088 af Overall Storage Efficiency = 62.0% Overall System Size = 47.37' x 19.42' x 6.75' 20 Chambers 229.9 cy Field 145.8 cy Stone Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 72HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond Bio1: Bioretention Area #1 Inflow Area = 14,139 sf, 66.97% Impervious, Inflow Depth > 4.76" for 50-Year event Inflow = 1.53 cfs @ 12.07 hrs, Volume= 5,603 cf Outflow = 0.34 cfs @ 12.48 hrs, Volume= 5,602 cf, Atten= 78%, Lag= 24.4 min Discarded = 0.34 cfs @ 12.48 hrs, Volume= 5,602 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 55.85' @ 12.48 hrs Surf.Area= 1,780 sf Storage= 1,278 cf Plug-Flow detention time= 21.3 min calculated for 5,590 cf (100% of inflow) Center-of-Mass det. time= 21.1 min ( 772.7 - 751.6 ) Volume Invert Avail.Storage Storage Description #1 55.00' 3,806 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 55.00 1,216 0 0 56.00 1,877 1,547 1,547 57.00 2,642 2,260 3,806 Device Routing Invert Outlet Devices #1 Discarded 55.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.34 cfs @ 12.48 hrs HW=55.85' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.34 cfs) Type III 24-hr 50-Year Rainfall=6.97"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 73HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond Bio2: Bioretention Area #2 Inflow Area = 3,353 sf, 53.36% Impervious, Inflow Depth > 3.59" for 50-Year event Inflow = 0.32 cfs @ 12.08 hrs, Volume= 1,003 cf Outflow = 0.08 cfs @ 12.49 hrs, Volume= 1,003 cf, Atten= 76%, Lag= 24.7 min Discarded = 0.08 cfs @ 12.49 hrs, Volume= 1,003 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 54.91' @ 12.49 hrs Surf.Area= 403 sf Storage= 270 cf Plug-Flow detention time= 26.0 min calculated for 1,003 cf (100% of inflow) Center-of-Mass det. time= 25.7 min ( 855.4 - 829.7 ) Volume Invert Avail.Storage Storage Description #1 54.00' 1,301 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 54.00 191 0 0 55.00 424 308 308 56.00 737 581 888 56.50 916 413 1,301 Device Routing Invert Outlet Devices #1 Discarded 54.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.08 cfs @ 12.49 hrs HW=54.91' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.08 cfs) Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 74HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1,151 sf 0.00% Impervious Runoff Depth>1.22"Subcatchment 5S: Proposed retained north Tc=5.0 min CN=39 Runoff=0.03 cfs 117 cf Runoff Area=4,670 sf 0.00% Impervious Runoff Depth>1.22"Subcatchment Bio#1: Area to Bio#1 Tc=5.0 min CN=39 Runoff=0.11 cfs 474 cf Runoff Area=3,600 sf 100.00% Impervious Runoff Depth>7.91"Subcatchment Bldg: Building Roof Tc=5.0 min CN=98 Runoff=0.67 cfs 2,372 cf Runoff Area=3,648 sf 100.00% Impervious Runoff Depth>7.91"Subcatchment Canopy: Canopy Roof Tc=5.0 min CN=98 Runoff=0.67 cfs 2,404 cf Runoff Area=3,472 sf 0.00% Impervious Runoff Depth>1.22"Subcatchment Pro Abutter: Proposed runoff Tc=5.0 min CN=39 Runoff=0.08 cfs 353 cf Runoff Area=14,087 sf 73.17% Impervious Runoff Depth>6.00"Subcatchment To CB1: Area to CB#1 Tc=5.0 min CN=82 Runoff=2.23 cfs 7,042 cf Runoff Area=3,353 sf 53.36% Impervious Runoff Depth>4.59"Subcatchment To CB2: Area to CB#2 Tc=5.0 min CN=70 Runoff=0.41 cfs 1,283 cf Runoff Area=11,524 sf 80.94% Impervious Runoff Depth>6.59"Subcatchment To CB3: Area to CB#3 Tc=5.0 min CN=87 Runoff=1.96 cfs 6,331 cf Runoff Area=5,869 sf 100.00% Impervious Runoff Depth>7.91"Subcatchment To DI#1: Area to DI#1 Tc=5.0 min CN=98 Runoff=1.09 cfs 3,867 cf Peak Elev=55.04' Storage=3 cf Inflow=0.03 cfs 117 cfPond 6P: PRO depression north Outflow=0.02 cfs 117 cf Peak Elev=54.17' Storage=3,015 cf Inflow=2.23 cfs 7,042 cfPond 16: (16) MC-4500 CHAMBERS#1 Outflow=0.15 cfs 7,039 cf Peak Elev=53.87' Storage=3,554 cf Inflow=2.63 cfs 8,734 cfPond 20: (20) MC-4500 CHAMBERS#2 Outflow=0.18 cfs 8,731 cf Peak Elev=56.06' Storage=1,665 cf Inflow=1.84 cfs 6,713 cfPond Bio1: Bioretention Area #1 Outflow=0.37 cfs 6,711 cf Peak Elev=55.15' Storage=375 cf Inflow=0.41 cfs 1,283 cfPond Bio2: Bioretention Area #2 Outflow=0.09 cfs 1,282 cf Total Runoff Area = 51,374 sf Runoff Volume = 24,242 cf Average Runoff Depth = 5.66" 32.77% Pervious = 16,833 sf 67.23% Impervious = 34,541 sf Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 75HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Proposed retained north [49] Hint: Tc<2dt may require smaller dt Runoff = 0.03 cfs @ 12.11 hrs, Volume= 117 cf, Depth> 1.22" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=8.15" Area (sf) CN Description 1,151 39 >75% Grass cover, Good, HSG A 1,151 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 76HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Bio#1: Area to Bio#1 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.11 cfs @ 12.11 hrs, Volume= 474 cf, Depth> 1.22" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=8.15" Area (sf) CN Description 4,670 39 >75% Grass cover, Good, HSG A 4,670 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 77HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Bldg: Building Roof [49] Hint: Tc<2dt may require smaller dt Runoff = 0.67 cfs @ 12.07 hrs, Volume= 2,372 cf, Depth> 7.91" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=8.15" Area (sf) CN Description 3,600 98 Unconnected roofs, HSG A 3,600 100.00% Impervious Area 3,600 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 78HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Canopy: Canopy Roof [49] Hint: Tc<2dt may require smaller dt Runoff = 0.67 cfs @ 12.07 hrs, Volume= 2,404 cf, Depth> 7.91" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=8.15" Area (sf) CN Description 3,648 98 Unconnected roofs, HSG A 3,648 100.00% Impervious Area 3,648 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 79HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment Pro Abutter: Proposed runoff to abutter [49] Hint: Tc<2dt may require smaller dt Runoff = 0.08 cfs @ 12.11 hrs, Volume= 353 cf, Depth> 1.22" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=8.15" Area (sf) CN Description 3,472 39 >75% Grass cover, Good, HSG A 3,472 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 80HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB1: Area to CB#1 [49] Hint: Tc<2dt may require smaller dt Runoff = 2.23 cfs @ 12.07 hrs, Volume= 7,042 cf, Depth> 6.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=8.15" Area (sf) CN Description 10,308 98 Paved parking, HSG A 3,779 39 >75% Grass cover, Good, HSG A 14,087 82 Weighted Average 3,779 26.83% Pervious Area 10,308 73.17% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 81HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB2: Area to CB#2 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.41 cfs @ 12.08 hrs, Volume= 1,283 cf, Depth> 4.59" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=8.15" Area (sf) CN Description 1,789 98 Paved parking, HSG A 1,564 39 >75% Grass cover, Good, HSG A 3,353 70 Weighted Average 1,564 46.64% Pervious Area 1,789 53.36% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 82HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To CB3: Area to CB#3 [49] Hint: Tc<2dt may require smaller dt Runoff = 1.96 cfs @ 12.07 hrs, Volume= 6,331 cf, Depth> 6.59" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=8.15" Area (sf) CN Description 9,327 98 Paved parking, HSG A 2,197 39 >75% Grass cover, Good, HSG A 11,524 87 Weighted Average 2,197 19.06% Pervious Area 9,327 80.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 83HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment To DI#1: Area to DI#1 [49] Hint: Tc<2dt may require smaller dt Runoff = 1.09 cfs @ 12.07 hrs, Volume= 3,867 cf, Depth> 7.91" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=8.15" Area (sf) CN Description 5,869 98 Paved parking, HSG A 5,869 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 84HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 6P: PRO depression north Inflow Area = 1,151 sf, 0.00% Impervious, Inflow Depth > 1.22" for 100-Year event Inflow = 0.03 cfs @ 12.11 hrs, Volume= 117 cf Outflow = 0.02 cfs @ 12.23 hrs, Volume= 117 cf, Atten= 28%, Lag= 7.1 min Discarded = 0.02 cfs @ 12.23 hrs, Volume= 117 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 55.04' @ 12.23 hrs Surf.Area= 98 sf Storage= 3 cf Plug-Flow detention time= 1.2 min calculated for 117 cf (100% of inflow) Center-of-Mass det. time= 1.0 min ( 909.1 - 908.1 ) Volume Invert Avail.Storage Storage Description #1 55.00' 193 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 55.00 91 0 0 56.00 294 193 193 Device Routing Invert Outlet Devices #1 Discarded 55.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.02 cfs @ 12.23 hrs HW=55.04' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.02 cfs) Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 85HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 16: (16) MC-4500 CHAMBERS#1 Inflow Area = 14,087 sf, 73.17% Impervious, Inflow Depth > 6.00" for 100-Year event Inflow = 2.23 cfs @ 12.07 hrs, Volume= 7,042 cf Outflow = 0.15 cfs @ 11.25 hrs, Volume= 7,039 cf, Atten= 93%, Lag= 0.0 min Discarded = 0.15 cfs @ 11.25 hrs, Volume= 7,039 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 54.17' @ 13.65 hrs Surf.Area= 763 sf Storage= 3,015 cf Plug-Flow detention time= 178.4 min calculated for 7,024 cf (100% of inflow) Center-of-Mass det. time= 177.8 min ( 973.9 - 796.1 ) Volume Invert Avail.Storage Storage Description #1A 47.92' 1,323 cf 19.42'W x 39.32'L x 6.75'H Field A 5,153 cf Overall - 1,847 cf Embedded = 3,306 cf x 40.0% Voids #2A 48.67' 1,847 cf ADS_StormTech MC-4500 +Cap x 16 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 16 Chambers in 2 Rows Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 3,169 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 47.92'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.15 cfs @ 11.25 hrs HW=47.99' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.15 cfs) Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 86HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Pond 16: (16) MC-4500 CHAMBERS#1 - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-4500 +Cap (ADS StormTech® MC-4500 with cap volume) Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 100.0" Wide + 9.0" Spacing = 109.0" C-C Row Spacing 8 Chambers/Row x 4.02' Long +2.56' Cap Length x 2 = 37.32' Row Length +12.0" End Stone x 2 = 39.32' Base Length 2 Rows x 100.0" Wide + 9.0" Spacing x 1 + 12.0" Side Stone x 2 = 19.42' Base Width 9.0" Base + 60.0" Chamber Height + 12.0" Cover = 6.75' Field Height 16 Chambers x 106.5 cf + 35.7 cf Cap Volume x 2 x 2 Rows = 1,846.6 cf Chamber Storage 5,152.9 cf Field - 1,846.6 cf Chambers = 3,306.3 cf Stone x 40.0% Voids = 1,322.5 cf Stone Storage Chamber Storage + Stone Storage = 3,169.2 cf = 0.073 af Overall Storage Efficiency = 61.5% Overall System Size = 39.32' x 19.42' x 6.75' 16 Chambers 190.8 cy Field 122.5 cy Stone Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 87HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond 20: (20) MC-4500 CHAMBERS#2 Inflow Area = 15,172 sf, 85.52% Impervious, Inflow Depth > 6.91" for 100-Year event Inflow = 2.63 cfs @ 12.07 hrs, Volume= 8,734 cf Outflow = 0.18 cfs @ 11.15 hrs, Volume= 8,731 cf, Atten= 93%, Lag= 0.0 min Discarded = 0.18 cfs @ 11.15 hrs, Volume= 8,731 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 53.87' @ 13.48 hrs Surf.Area= 920 sf Storage= 3,554 cf Plug-Flow detention time= 162.2 min calculated for 8,713 cf (100% of inflow) Center-of-Mass det. time= 161.6 min ( 932.8 - 771.2 ) Volume Invert Avail.Storage Storage Description #1A 47.92' 1,574 cf 19.42'W x 47.37'L x 6.75'H Field A 6,208 cf Overall - 2,273 cf Embedded = 3,935 cf x 40.0% Voids #2A 48.67' 2,273 cf ADS_StormTech MC-4500 +Cap x 20 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.02'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 20 Chambers in 2 Rows Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 3,847 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 47.92'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.18 cfs @ 11.15 hrs HW=47.99' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.18 cfs) Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 88HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Pond 20: (20) MC-4500 CHAMBERS#2 - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-4500 +Cap (ADS StormTech® MC-4500 with cap volume) Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.02'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 100.0" Wide + 9.0" Spacing = 109.0" C-C Row Spacing 10 Chambers/Row x 4.02' Long +2.56' Cap Length x 2 = 45.37' Row Length +12.0" End Stone x 2 = 47.37' Base Length 2 Rows x 100.0" Wide + 9.0" Spacing x 1 + 12.0" Side Stone x 2 = 19.42' Base Width 9.0" Base + 60.0" Chamber Height + 12.0" Cover = 6.75' Field Height 20 Chambers x 106.5 cf + 35.7 cf Cap Volume x 2 x 2 Rows = 2,272.6 cf Chamber Storage 6,208.0 cf Field - 2,272.6 cf Chambers = 3,935.4 cf Stone x 40.0% Voids = 1,574.2 cf Stone Storage Chamber Storage + Stone Storage = 3,846.8 cf = 0.088 af Overall Storage Efficiency = 62.0% Overall System Size = 47.37' x 19.42' x 6.75' 20 Chambers 229.9 cy Field 145.8 cy Stone Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 89HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond Bio1: Bioretention Area #1 Inflow Area = 14,139 sf, 66.97% Impervious, Inflow Depth > 5.70" for 100-Year event Inflow = 1.84 cfs @ 12.07 hrs, Volume= 6,713 cf Outflow = 0.37 cfs @ 12.51 hrs, Volume= 6,711 cf, Atten= 80%, Lag= 26.0 min Discarded = 0.37 cfs @ 12.51 hrs, Volume= 6,711 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 56.06' @ 12.51 hrs Surf.Area= 1,925 sf Storage= 1,665 cf Plug-Flow detention time= 27.3 min calculated for 6,697 cf (100% of inflow) Center-of-Mass det. time= 27.1 min ( 778.7 - 751.6 ) Volume Invert Avail.Storage Storage Description #1 55.00' 3,806 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 55.00 1,216 0 0 56.00 1,877 1,547 1,547 57.00 2,642 2,260 3,806 Device Routing Invert Outlet Devices #1 Discarded 55.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.37 cfs @ 12.51 hrs HW=56.06' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.37 cfs) Type III 24-hr 100-Year Rainfall=8.15"42-21-20002HydrocadPRO2 Printed 7/10/2023Prepared by {enter your company name here} Page 90HydroCAD® 10.00-26 s/n 01750 © 2020 HydroCAD Software Solutions LLC Summary for Pond Bio2: Bioretention Area #2 Inflow Area = 3,353 sf, 53.36% Impervious, Inflow Depth > 4.59" for 100-Year event Inflow = 0.41 cfs @ 12.08 hrs, Volume= 1,283 cf Outflow = 0.09 cfs @ 12.50 hrs, Volume= 1,282 cf, Atten= 78%, Lag= 25.6 min Discarded = 0.09 cfs @ 12.50 hrs, Volume= 1,282 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 55.15' @ 12.50 hrs Surf.Area= 471 sf Storage= 375 cf Plug-Flow detention time= 33.3 min calculated for 1,279 cf (100% of inflow) Center-of-Mass det. time= 33.0 min ( 855.6 - 822.6 ) Volume Invert Avail.Storage Storage Description #1 54.00' 1,301 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 54.00 191 0 0 55.00 424 308 308 56.00 737 581 888 56.50 916 413 1,301 Device Routing Invert Outlet Devices #1 Discarded 54.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.09 cfs @ 12.50 hrs HW=55.15' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.09 cfs)