HomeMy WebLinkAboutHydrology and Hydraulic Report 12.2025
Hydrology and Hydraulic Report
Bayview Bogs Ecological Restoration
Prepared for:
Cape Cod Conservation District
West Yarmouth, Massachusetts
December 2025
Preparer:
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Table of Contents
Hydrologic and Hydraulic Report
Bayview Bogs Ecological Restoration
1 Project Background .......................................................................................................................................... 3
1.1 Site Description ........................................................................................................................................ 3
1.2 Previous Assessment .............................................................................................................................. 3
2 Data Collection .................................................................................................................................................. 3
3 Engineering Methods ........................................................................................................................................ 4
3.1 Hydrologic Analysis ................................................................................................................................. 4
3.1.1 Watershed Model ................................................................................................................................. 4
3.1.2 Design Storm ....................................................................................................................................... 4
3.1.3 Soil Loss Methodology ......................................................................................................................... 5
3.1.4 Lag Time .............................................................................................................................................. 6
3.1.5 Predicted Peak Flow Discharge Summary .......................................................................................... 6
3.2 Hydraulic Analysis ................................................................................................................................... 7
3.2.1 Existing & Proposed Conditions Terrain Development and Hydraulic Structures ............................... 7
3.2.2 Roughness Factors .............................................................................................................................. 8
3.2.3 Boundary & Initial Conditions ............................................................................................................... 8
3.2.4 Existing and Proposed Conditions Model Results ............................................................................... 9
4 Conclusions and Recommendations ............................................................................................................ 11
4.1 Conclusions ............................................................................................................................................ 11
5 References ....................................................................................................................................................... 11
5.1 Data Sources .......................................................................................................................................... 11
Appendices End of Report
A Hydrologic Analysis Supporting Documentation
B Hydraulic Analysis Supporting Documentation
C Hydraulic Analysis Results
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1 Project Background
On behalf of the Cape Cod Conservation District, Fuss & O’Neill, Inc. has prepared this Hydrology and Hydraulic
Analysis (H&H) Report for an Ecological Restoration (ER) Project for the restoration of Bayview Bogs, a former
cranberry bog located at 0 Rosetta Street, West Yarmouth, Massachusetts. The proposed project is a
collaborative partnership between Cape Cod Hospital (as landowner), the Cape Cod Conservation District, and
the Massachusetts Division of Ecological Restoration (DER) to restore the former cranberry bogs into a healthy
wetland ecosystem. Proposed activities include the reversal of hydrologic modifications put in place when the
bogs were under active cranberry production: the removal of water control structures, ditches, berms, and other
physical barriers to tidal flow or hydrologic connectivity, restoration of hydrologic connectivity between currently
isolated portions of the former cranberry bog, excavation to establish a range of seasonally flooded wetland
habitats, and facilitation of future marsh migration via grading of a low-slope marsh transition zone. and
improved wetland habitats, and
1.1 Site Description
The Project Site covers approximately 90-acres located primarily on Yarmouth Assessor Parcel No. 58.1.1 with
portions of the work extending onto several adjacent hospital-owned parcels that contain portions of the former
cranberry bog system The site was previously agricultural land utilized for commercial cranberry farming, however
in recent years the cranberry bog has remained dormant and has transitioned to upland woodlands across much
of the former bog. Land cover in the site consists primarily of woodland and wetland environments that are
located within the local floodplain. The project site is bounded primarily by residential properties, with developed
impervious parking parking lots for the adjacent hospital to the northwest.
The location of the project is depicted on the USGS Topographic Map included as Figure 1, and the Site Plans
provided as Appendix C.
1.2 Previous Assessment
Bayview Bogs was previously assessed and evaluated by Horsley Witten Group, Inc. (HW) in 2024 under contract
with the Cape Cod Conservation District (CCCD). The purpose of this evaluation was to assess the existing soil,
habitat, and hydrologic conditions at the site to support future ecological restoration activities. HW produced a
report titled “Bayview Bogs Restoration – Existing Conditions Assessment” dated November 2024, which is
referenced in this H&H report.
2 Data Collection
An array of field data was collected during the current and previous phases of the ecological restoration project.
Previously, Down Cape Engineering, Inc. produced a land survey of the site including information regarding
former cranberry bogs, water control structure locations, drainage ditches, and perimeter and lateral ditches,
dated December 17, 2023. Additional spot elevations were captured within the project site by Fuss & O'Neill field
personnel on March 11, 2024. Prior hydrologic evaluation data developed by Horsley Witten Group, Inc. including
continuous water elevation graphs captured from 22 water level loggers on the project site during multiple
monitoring windows in 2023 and 2024 were utilized in the development of the hydrologic and hydraulic models.
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3 Engineering Methods
3.1 Hydrologic Analysis
A hydrologic model for Bayview Bogs was developed using the U.S Army Corps of Engineers HEC-HMS (Version
4.5) software. This model was created to develop stormwater runoff hydrographs accounting for soil-water
infiltration, runoff transform (the method of transforming excess precipitation into surface runoff), the amount of
impervious area within the watershed, the amount of time that it takes for water to flow from the most remote point
in a watershed to its outlet, and the distribution of rainfall intensity over time.
3.1.1 Watershed Model
The drainage area that contributes runoff to Bayview Bogs is approximately 198 acres in area and consists mostly
of retired cranberry bogs, upland forest, and scattered wetlands, with a fairly large percentage of developed
residential, and a smaller percentage of impervious area draining to the wetlands. Stormwater infrastructure plans
for the Cape Cod Hospital, stormwater GIS data from the Town of Yarmouth, and 2021 USGS Central Eastern
Massachusetts Lidar were analyzed to understand stormwater infrastructure and topographic drainage patterns
and their contribution of stormwater to the project site. The total contributing drainage area was delineated in the
HEC-HMS program and was split into six (6) sub-basins representing contributing areas to each individual bog
cell. The site drainage map is depicted on Figure 2 and Subbasin watershed areas are tabulated in Table 1.
Table 1: Subbasin Watershed Area
Subbasin Area (acres)
Bog 01 32.39
Bog 02 50.71
Bog 03 30.02
Bog 04 36.93
Overland 01 20.17
Overland 02 28.17
3.1.2 Design Storm
The meteorological model in HEC-HMS was set up for a hypothetical storm using an SCS Type III distribution. Eight
(8) design storms were selected for the analysis: the existing and projected (future year 2070) 100% (1-year), 10%
(10-year), 2% (50-year), and 1% (100-year) design storms. Existing precipitation depth values were obtained from
NOAA Atlas-14 (for the 24-hour storm events durations); future precipitation depth values were obtained from RMAT
Climate Change Projection Dashboard for Yarmouth and are shown in Table 2.
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Table 2: 24-Hour Design Storm Normal Depths (NOAA Atlas 14 and RMAT Guidelines)
Design Storm Exist. Precipitation Depth
from NOAA Atlas 14 (in.)
Projected (2070) Precipitation
Depth from RMAT (in.)
1-year 2.87 3.801
10-year 4.93 6.501
50-year 6.63 8.701
100-year 7.39 9.701
Notes:
1 Projected precipitation value obtained from RMAT Climate Change Projection Dashboard for Yarmouth (IDF
Site 7904, 50th percentile) .
3.1.3 Soil Loss Methodology
The NRCS Curve Number (CN) method was used to calculate infiltration losses for the Bayview Bogs Watershed.
This method calculates infiltration using curve numbers, which are dimensionless parameters that represent the
combined effects of United States Geological Surveys (USGS) defined soil types, land covers, hydrologic conditions,
and antecedent runoff conditions within the watershed. Curve numbers are estimated based on land cover and soil
type.
To determine the composite Curve Number for the watershed, soil and land use data were obtained from the USDA
Natural Resources Conservation Service (NRCS) Web Soil Survey (WSS) Database (SSURGO 2.2), and the Land
Use data (2021) was obtained from the USGS National Land Cover Database (NLCD). NRCS classifies soils into
four hydrologic groups: Type A, B, C, and D soils. ‘Type A’ soils have high infiltration capacity and typically consist
of coarse sands, while ‘Type D’ soils have very low infiltration capacity, typically due to a restrictive layer or clay
content. For the total watershed, vast majority of the soils are classified as Type A, while a small minority of the
soils are classified as Type B/D.
Based on NLCD database, the primary land uses in the watershed are non-forested wetlands and low/medium
residential development density. Curve numbers were assigned to each of the land uses using guidance from Table
2-2a in the USDA Urban Hydrology for Small Watersheds TR-55 document. Composite curve numbers were
calculated for each of the six subbasin and are presented in Table 3 below.
Table 3: Subbasin Curve Numbers
Subbasin Curve Number
Bog 01 59.89
Bog 02 67.05
Bog 03 61.10
Bog 04 60.36
Overland 01 76.70
Overland 02 58.43
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3.1.4 Lag Time
Surface runoff routing calculations for the six subbasins were evaluated using the NRCS unit hydrograph method.
The NRCS unit hydrograph is an approximate best-fit hydrograph derived by approximating data obtained from
agricultural watersheds and then scaling the resultant hydrographs by a delayed time lag. The standard lag for a
basin is conceptually defined as the length of time between the centroid of precipitation and peak flow of the
resulting hydrograph at the basin’s outlet (Natural Resource Conservation Service, 2010). Time of concentration
for a basin is the time taken for runoff to travel from the hydraulically most distant point of the basin to a point of
interest within the basin. In general, the lag time can be approximated as 0.6 times the time of concentration
according to Chapter 15 of Part 630 of the National Engineering Handbook (Natural Resource Conservation
Service, 2010). Time of concentration is computed by summing the travel times for consecutive components of
the hydraulically longest flow path, which can generally be characterized into three types: sheet flow, shallow
concentrated flow, and open channel flow. The calculated lag times for the six subbasins are tabulated in Table 4.
Table 4: Subbasin Watershed Area
Subbasin Lag Time (min)
Bog 01 6.92
Bog 02 7.11
Bog 03 4.85
Bog 04 7.48
Overland 01 9.78
Overland 02 16.75
3.1.5 Predicted Peak Flow Discharge Summary
With the soil loss parameter (curve number), lag time, impervious percentage, and rainfall distribution curves
computed, runoff hydrographs for the watershed were then generated using HEC-HMS. Table 5 summarizes peak
inflow runoff rates generated by the six sub-basins for the 1-, 10-, 50-, and 100-year, 24-hour return frequency flood
events under both existing and projected (2070) conditions.
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Table 5: Peak Flow Discharge Summary
Subbains Condition
Drainage
Area
(ac)
100% AEP
[1-yr]
(CFS)
10% AEP
[10-yr]
(CFS)
2% AEP
[50-yr]
(CFS)
1% AEP
[100-yr]
(CFS)
Bog 01 Existing 32.39
15.24 50.70 87.63 105.44
Future 29.43 84.65 137.44 162.68
Bog 02 Existing 50.71
28.46 93.12 156.87 186.94
Future 55.26 151.81 240.17 281.62
Bog 03 Existing 30.02
21.63 59.95 97.93 116.01
Future 37.48 94.90 148.24 173.51
Bog 04 Existing 36.93
41.01 88.36 132.93 153.79
Future 61.07 129.41 190.69 219.45
Overland 01 Existing 20.17
41.52 75.73 104.54 117.48
Future 56.81 102.33 139.83 156.90
Overland 02 Existing 28.17
22.62 48.35 73.44 85.26
Future 33.23 71.45 106.26 122.69
Refer to Appendix A for hydrologic analysis supporting documentation.
3.2 Hydraulic Analysis
With present-day and projected (2070) flow hydrographs for Bayview Bogs watershed generated for the 1-, 10-,
50-, and 100-year return frequency flood events, the HEC-RAS River Analysis System (Version 6.5) was utilized
to develop the existing and proposed hydraulic models for this project. The analysis was run as a two-dimensional
(2D) hydrodynamic model. The data and assumptions applied to the model are discussed below.
3.2.1 Existing & Proposed Conditions Terrain Development
and Hydraulic Structures
The existing conditions 2D terrain or surface model was developed by combining 2021 USGS Central Eastern
Massachusetts LiDAR with 2023 site surveys at Bayview Bogs performed by Down Cape Engineering, Inc. and
supplemental spot shots captured by Fuss & O’Neill in 2024. The water control structures, culvert inverts, and
spot elevations featured in these topographic plans were implemented into the existing conditions surface model.
The topographic plans for Bayview Bogs and all related 2D terrain data are referenced to the NAVD88 vertical
datum. All elevations listed in this report are referenced to NAVD 1988 unless otherwise noted.
Proposed activities include the reversal of hydrologic modifications put in place when the bogs were under active
cranberry production: the removal of water control structures, ditches, berms, and other physical barriers to tidal
flow or hydrologic connectivity, restoration of hydrologic connectivity between currently isolated portions of the
former cranberry bog, excavation to establish a range of seasonally flooded wetland habitats, and facilitation of
future marsh migration via grading of a low-slope marsh transition zone. Three existing water control structures
at the outlet (berms and culverts) were replaced with open channel grading to form earth grade controls while
the remaining existing water control structures were removed and blended into existing grades upstream and
downstream. Excavation is proposed in select areas to lower the ground surface elevation and promote the
formation of semi-permanently and seasonally flooded wetlands. Excavated material from these areas will be
used to fill interior/perimeter ditches or exported to upland depositional areas.
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The proposed conditions 2D terrain model was created by modifying the existing 2D terrain surface with the
proposed conditions grading depicted in the site grading plan in Appendix B.
3.2.2 Roughness Factors
HEC-RAS used the Manning’s n value as a representation of the roughness of the ground surface. The
Manning’s n values are classified based on USGS National Land Cover Database (NLCD) 2021. The Manning’s
n values associated with each land cover type are presented in the table below. These Manning’s n values were
assigned based on Table 2.1 in the 2-D HEC-RAS User’s Manual (2023).
Table 4: Manning’s n and Land Cover Association Table
Landcover Manning’s n
No Data 0.04
Pasture-Hay 0.035
Shrub-Scrub 0.05
Open Water 0.035
Grassland 0.05
Developed, Open 0.03
Developed, Low 0.06
Developed, Medium 0.08
Developed, High 0.12
Deciduous Forest 0.1
Evergreen Forest 0.08
Mixed Forest 0.08
Woody Wetlands 0.045
Emergent Herbaceous Wetlands 0.05
3.2.3 Boundary & Initial Conditions
The 2-D model for Bayview Bogs included seven boundary conditions: six internal flow boundary conditions and
one downstream boundary condition. The internal flow boundary condition was placed at the upstream extent of
each bog and at the downstream extent of each upland area contributing overland runoff. The boundary condition
flow hydrographs for the 1-,10-, 50-, and 100-year return frequency flood events for present-day and projected
(2070) conditions were based on the HEC-HMS modeling as described herein.
The model was evaluated under a variety of downstream boundary conditions. Under the current climate
conditions, the model’s downstream boundary was a 2-day observed tidal water surface elevation (WSE) cycle.
This data was captured by Horsley Witten Group, Inc. utilizing a water monitoring location within Hyannis Inner
Harbor during a six-month monitoring window from March - August 2024. First, the maximum tidal elevation
during this six-month monitoring window was identified and then a two-day observed tidal water surface elevation
cycle created utilizing the water surface elevations from the day prior and the day following the observed
maximum tidal elevation. The maximum and minimum water surface elevations observed during this 2-day tidal
cycle were 2.96 ft and -1.9 ft NAVD88, corresponding with the highest tidal elevation observed during the
monitoring period from March to August 2024.
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Under future condition (2070 Horizon), a static water surface elevation of 4.3ft NAVD was utilized as the
downstream boundary representing the Mean Sea Level in the southern Region of Massachusetts in the year
2070 following the predicted sea level rise documented in Appendix B of Massachusetts Climate Change
Assessment (December 2022). One final evaluation was completed utilizing a future horizon year 2070 100-year
coastal storm surge elevation of 16 ft NAVD as predicted by Massachusetts Coast Flood Risk Model (MC-FRM1).
In summary the following 2D model simulations were completed for the existing and proposed conditions:
No Inland Precipitation and Observed Tidal Curve
Current Climate Inland Precipitation and Observed Tidal Curve
Future Climate Inland Precipitation and Future Mean Sea Level
No Inland Precipitation and 2070 Coastal Surge for 100-Year Storm
3.2.4 Existing and Proposed Conditions Model Results
The existing and projected (2070) 1-, 10, 50-, and 100-year flow hydrographs were applied to the HEC-RAS 2D
hydraulic model to assess the changes in water surface elevations at critical reference locations, such as
surrounding private residential properties and Park Avenue culvert crossing downstream of Bayview Bogs, to
evaluate the proposed activities and system water surface elevations. Refer to Appendix C for existing and
proposed conditions result hydraulic analysis result maps.
No Inland Precipitation and Observed Tidal Curve
The removal of the water control structure/tidal restriction at the outlet of Bayview Bogs provides the area with a
more natural channel configuration and greater hydraulic opening to improve the hydraulic connectivity allowing
for tidal flows to extend further into the wetland system. The observed tidal curve cycles from approximately 2.96
ft to -1.9 ft NAVD88. Within model simulations of proposed conditions with no inland precipitation, the proposed
changes allow tidal flow to extend further into the restored bog system. Because the maximum elevation of the
tidal range is 2.96 ft, water surface elevations do not increase between existing and proposed conditions in any
identified critical reference locations (such as surrounding private property or roadway surfaces) as the tidal water
surface elevations remain within the bog.
Current Climate Inland Precipitation and Observed Tidal Curve
The existing and proposed conditions were evaluated under 1-, 10, 50-, and 100-year flow hydrographs, and an
observed downstream tidal curve. For both existing and proposed conditions, under all modeled storm events, the
flood extent remains within the bog/project site and does not worsen water surface elevations or extend into any
new areas on surrounding private properties or critical roadway surfaces (Park Ave). Under more frequent storm
events (1- and 10-year storms) the existing bog system behaves as individual hydrologic reservoirs with limited
interconnectivity. By removing the water control structures between bog cells within the proposed conditions
model, the bog behaves as one interconnected hydrologic system. Under less frequent storm events (50- and
100-year storms) more of the restored wetland surface across the bog system is utilized for flood storage than
within existing bog conditions, resulting in decreased water surface elevations in upland areas.
1 Woods Hole Group Future Climate WSE Model - Region 6
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Future Climate Inland Precipitation and Future Mean Sea Level
The existing and proposed conditions were evaluated under future horizon (year 2070) 1-, 10, 50-, and 100-year
flow hydrographs, and a static water surface elevation of 4.3ft NAVD representing predicted 2070 Mean Sea
Level. Due to the heightened tailwater condition from future sea level rise, the model results revealed that the
southeastern Park Ave culvert crossing (low point of 3.25 ft NAVD) is overtopped for both existing and proposed
conditions. However, the water surface elevation at this culvert crossing is at an equal or lower elevation for
proposed conditions compared to existing conditions. Outside of this one overtopped roadway due to heightened
tailwater, the remainder of the flood extent remains within the bog/project site and does not worsen or extend into
any new areas on surrounding private properties.
No Inland Precipitation and 2070 Coastal Surge for 100-Year Storm
The future horizon year 2070 100-year coastal storm surge elevation is 16 ft NAVD. The bog surface elevation
where most proposed grading is occurring is between elevations 3 ft and 8 ft NAVD88. As a result, during this
coastal surge event the proposed conditions are under approximately 8 to 13 feet of water. Therefore, the
proposed activities have no significant influence on water surface elevations or any other site conditions during
this extreme event. Refer to Appendix C for existing and proposed conditions result hydraulic analysis result
maps.
Illustration 1 - Proposed Conditions Bog Cell Drainage Pattern
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4 Conclusions and Recommendations
4.1 Conclusions
The existing conditions at the project site are poor due to the overgrown invasive species and its inability to
function as a natural wetland due to the physical barriers disrupting hydrologic and tidal connectivity. The
proposed activities will restore the site to a healthy, functioning, and self-sustaining wetland condition by undoing
historic agricultural modifications to hydrology. These proposed conditions were evaluated utilizing a HEC-RAS
2D model to evaluate and determine that the proposed restoration conditions within the bog did not detrimentally
increase water surface elevations at any reference locations outside of the project site footprint.
5 References
5.1 Data Sources
1. Horsley Witten Group, Inc, “Bayview Bogs Restoration – Existing Conditions Assessment”, November 2024.
2. Down Cape Engineering, Inc., Topographic Survey, December 17, 2023
3. MassGIS Data, 2021 USGS Central Eastern Massachusetts Lidar Data.
4. Massachusetts Climate Change Assessment (December 2022)
Figures 1
Site Location Map
Figures 2
Watershed Map
Appendix A
Hydrologic Analysis Supporting Documentation
Bayview Bogs Hydrologic Documentation
Contents
Existing 1-Year ............................................................................................................................................... 2
Watershed Summary ................................................................................................................................ 2
Subbasins .................................................................................................................................................. 3
Watershed Summary .............................................................................................................................. 13
Subbasins ................................................................................................................................................ 14
Existing 50-Year ........................................................................................................................................... 25
Watershed Summary .............................................................................................................................. 25
Subbasins ................................................................................................................................................ 26
Existing 100-Year ......................................................................................................................................... 37
Watershed Summary .............................................................................................................................. 37
Subbasins ................................................................................................................................................ 38
Page 1
Page 2
Existing 1-Year
Watershed Summary
Subbasin
ID
Drainage
Area
(acres)
Initial
Abstraction
(in)
Curve
Number
Impervious
Surface
(%)
Lag
Time
(minutes)
Peak
Discharge
(cfs)
Bog01 32.388 1.34 59.89 17.06 6.92 15.24
Bog02 50.708 0.98 67.05 9.16 7.11 28.46
Bog03 30.023 1.27 61.1 24.81 4.85 21.63
Bog04 36.926 1.31 60.36 46.50 7.48 41.01
Overland01 20.170 0.61 76.7 77.23 5.87 41.52
Overland02 28.165 1.42 58.43 44.87 16.75 22.62
Page 3
Subbasins
Subbasin ID: Bog01
Scenario: Existing 1-Year Depth Volume
Peak discharge: 15.24 cfs Time of peak: 01 Jan 2025, 12:10
Drainage area: 32.388 acres Total rainfall: 2.87 in 7.746 ac-ft
Initial abstraction: 1.34 in Losses: 2.14 in 5.788 ac-ft
Curve Number: 59.89 Precip excess: 0.73 in 1.958 ac-ft
Impervious surface: 17.06% Direct runoff: 0.73 in 1.958 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 6.92 minutes Total runoff: 0.73 in 1.958 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
B/D Developed, Open Space 0.271 0.84 84
B/D Developed, Low Density 1.516 4.68 85
C Developed, Low Density 0.605 1.87 80
A Undeveloped, Mixed Forest 1.121 3.46 36
B/D Wetlands, Forested 3.028 9.35 78
A Developed, Medium Density 4.699 14.51 61
A Developed, High Density 0.332 1.03 81
A Undeveloped, Grassland 3.753 11.59 50
B/D Developed, Medium Density 0.164 0.51 85
B/D Undeveloped, Grassland 0.479 1.48 84
A Developed, Low Density 2.678 8.27 57
A Wetlands, Non-Forested 3.07 9.48 30
A Developed, Open Space 0.164 0.51 49
A Wetlands, Forested 3.468 10.71 30
C Developed, High Density 0.079 0.24 80
B/D Wetlands, Non-Forested 5.957 18.39 78
B/D Undeveloped, Mixed Forest 0.37 1.14 79
C Developed, Medium Density 0.633 1.95 80
Weighted
Average
32.388 100 59.89
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
2.86 14 0.05672 0.0817 Sheet Flow
0.12 54.41 0.22968 7.7303 Shallow Concentrated Flow
8.55 350.08 0.0014 0.6821 Channel Flow
11.53 418.49 Total Lag Time = 6.92 minutes
Page 4
Page 5
Subbasin ID: Bog02
Scenario: Existing 1-Year Depth Volume
Peak discharge: 28.46 cfs Time of peak: 01 Jan 2025, 12:10
Drainage area: 50.708 acres Total rainfall: 2.87 in 12.128 ac-ft
Initial abstraction: 0.98 in Losses: 2.13 in 9.002 ac-ft
Curve Number: 67.05 Precip excess: 0.74 in 3.126 ac-ft
Impervious surface: 9.16% Direct runoff: 0.74 in 3.126 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 7.11 minutes Total runoff: 0.74 in 3.126 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
A Developed, Medium Density 2.754 5.43 61
B/D Undeveloped, Mixed Forest 0.086 0.17 79
B/D Wetlands, Non-Forested 13.346 26.32 78
B/D Developed, Medium Density 0.131 0.26 85
B/D Wetlands, Forested 14.844 29.27 78
A Undeveloped, Mixed Forest 1.432 2.82 36
A Developed, Open Space 1.721 3.39 49
A Wetlands, Forested 2.194 4.33 30
A Developed, Low Density 7.111 14.02 57
A Undeveloped, Grassland 2.481 4.89 50
B/D Developed, Low Density 1.491 2.94 85
A Wetlands, Non-Forested 1.938 3.82 30
B/D Developed, Open Space 0.883 1.74 84
B/D Undeveloped, Grassland 0.296 0.58 84
Weighted
Average 50.708 100 67.05
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
9.44 22.17 0.00717 0.0392 Sheet Flow
2.41 419.38 0.02038 2.9023 Shallow Concentrated Flow
0 1 0.03884 3.5925 Channel Flow
11.85 442.55 Total Lag Time = 7.11 minutes
Page 6
Page 7
Subbasin ID: Bog03
Scenario: Existing 1-Year Depth Volume
Peak discharge: 21.63 cfs Time of peak: 01 Jan 2025, 12:07
Drainage area: 30.023 acres Total rainfall: 2.87 in 7.181 ac-ft
Initial abstraction: 1.27 in Losses: 1.92 in 4.795 ac-ft
Curve Number: 61.10 Precip excess: 0.95 in 2.386 ac-ft
Impervious surface: 24.81% Direct runoff: 0.95 in 2.386 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 4.85 minutes Total runoff: 0.95 in 2.386 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
B/D Developed, Open Space 0.673 2.24 84
B/D Developed, Low Density 0.234 0.78 85
A Undeveloped, Barren Land 1.119 3.73 78
C Undeveloped, Barren Land 0.764 2.54 91
A Undeveloped, Mixed Forest 3.576 11.91 36
B/D Wetlands, Forested 0.263 0.88 78
A Developed, Medium Density 6.722 22.39 61
A Developed, High Density 0.948 3.16 81
A Undeveloped, Grassland 1.794 5.97 50
B/D Developed, Medium Density 0.006 0.02 85
B/D Undeveloped, Grassland 0.226 0.75 84
A Developed, Low Density 5.664 18.86 57
A Wetlands, Non-Forested 1.035 3.45 30
A Developed, Open Space 1.409 4.69 49
A Wetlands, Forested 0.242 0.81 30
C Developed, High Density 0.015 0.05 80
A Open Water 0.218 0.72 98
B/D Wetlands, Non-Forested 4.421 14.72 78
B/D Undeveloped, Mixed Forest 0.526 1.75 79
C Open Water 0.171 0.57 98
Weighted
Average
30.023 100 61.1
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
7.27 28.71 0.02306 0.0658 Sheet Flow
0.78 183.6 0.05947 3.9335 Shallow Concentrated Flow
0.03 6.07 0.03705 3.5087 Channel Flow
8.08 218.38 Total Lag Time = 4.85 minutes
Page 8
Page 9
Subbasin ID: Bog04
Scenario: Existing 1-Year Depth Volume
Peak discharge: 41.01 cfs Time of peak: 01 Jan 2025, 12:09
Drainage area: 36.926 acres Total rainfall: 2.87 in 8.831 ac-ft
Initial abstraction: 1.31 in Losses: 1.38 in 4.232 ac-ft
Curve Number: 60.36 Precip excess: 1.49 in 4.6 ac-ft
Impervious surface: 46.50% Direct runoff: 1.49 in 4.6 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 7.48 minutes Total runoff: 1.49 in 4.6 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
C Developed, Low Density 0.428 1.16 80
A/D Developed, Low Density 0.46 1.24 85
A Undeveloped, Barren Land 0.337 0.91 78
C Undeveloped, Barren Land 0.093 0.25 91
A/D Developed, Medium Density 0.674 1.83 85
B/D Wetlands, Forested 0 0 78
A Developed, Medium Density 17.573 47.59 61
A Developed, High Density 1.54 4.17 81
A/D Developed, High Density 0.067 0.18 85
A/D Developed, Open Space 0.255 0.69 84
A Developed, Low Density 7.312 19.8 57
A Wetlands, Non-Forested 0.159 0.43 30
A Developed, Open Space 6.145 16.64 49
A Wetlands, Forested 0.767 2.08 30
C Developed, High Density 0.099 0.27 80
C Developed, Medium Density 0.768 2.08 80
A Open Water 0.248 0.67 98
Weighted
Average
36.926 100 60.36
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
11.38 76.25 0.05316 0.1117 Sheet Flow
0.91 202.74 0.03317 3.7026 Shallow Concentrated Flow
0.17 29.1 0.02473 2.8666 Channel Flow
12.46 308.09 Total Lag Time = 7.48 minutes
Page 10
Page 11
Subbasin ID: Overland01
Scenario: Existing 1-Year Depth Volume
Peak discharge: 41.52 cfs Time of peak: 01 Jan 2025, 12:07
Drainage area: 20.17 acres Total rainfall: 2.87 in 4.824 ac-ft
Initial abstraction: 0.61 in Losses: 0.43 in 0.729 ac-ft
Curve Number: 76.70 Precip excess: 2.44 in 4.095 ac-ft
Impervious surface: 77.23% Direct runoff: 2.44 in 4.095 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 5.87 minutes Total runoff: 2.44 in 4.095 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
A Developed, Medium Density 1.579 7.83 61
A Developed, High Density 4.211 20.88 81
C Developed, High Density 6.514 32.3 80
B/D Wetlands, Forested 0.001 0 78
A Undeveloped, Mixed Forest 0.151 0.75 36
A Developed, Open Space 0.208 1.03 49
A Wetlands, Forested 0.077 0.38 30
A Developed, Low Density 1.04 5.16 57
C Developed, Low Density 0.354 1.75 80
C Developed, Medium Density 6.034 29.92 80
Weighted
Average
20.17 100 76.7
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length
(ft)
Slope (ft/ft) Velocity (ft/s) Description
2.17 163.33 0.02158 1.2543 Sheet Flow
7.35 921.92 0.01058 2.0911 Shallow Concentrated Flow
0.26 166.51 0.03936 10.8493 Channel Flow
9.78 1251.76 Total Lag Time = 5.87 minutes
Page 12
Subbasin ID: Overland02
Scenario: Existing 1-Year Depth Volume
Peak discharge: 22.62 cfs Time of peak: 01 Jan 2025, 12:19
Drainage area: 28.165 acres Total rainfall: 2.87 in 6.736 ac-ft
Initial abstraction: 1.42 in Losses: 1.45 in 3.396 ac-ft
Curve Number: 58.43 Precip excess: 1.42 in 3.34 ac-ft
Impervious surface: 44.87% Direct runoff: 1.42 in 3.34 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 16.75 minutes Total runoff: 1.42 in 3.34 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
A Developed, High Density 1.066 3.78 81
A Developed, Medium Density 12.337 43.8 61
B/D Developed, Medium Density 0.052 0.18 85
A Undeveloped, Mixed Forest 0.822 2.92 36
A Developed, Open Space 0.613 2.18 49
A Wetlands, Forested 0.237 0.84 30
A Developed, Low Density 11.273 40.02 57
A Undeveloped, Grassland 1.627 5.78 50
A Wetlands, Non-Forested 0.002 0.01 30
B/D Developed, Low Density 0.136 0.48 85
Weighted
Average 28.165 100 58.43
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
16.8 90 0.02793 0.0893 Sheet Flow
11.03 1203.28 0.01271 1.8185 Shallow Concentrated Flow
0.09 23.15 0.05811 4.2184 Channel Flow
27.92 1316.43 Total Lag Time = 16.75 minutes
Page 13
Existing 10-Year
Watershed Summary
Subbasin
ID
Drainage
Area
(acres)
Initial
Abstraction
(in)
Curve
Number
Impervious
Surface
(%)
Lag
Time
(minutes)
Peak
Discharge
(cfs)
Bog01 32.388 1.34 59.89 17.06 6.92 50.7
Bog02 50.708 0.98 67.05 9.16 7.11 93.12
Bog03 30.023 1.27 61.1 24.81 4.85 59.95
Bog04 36.926 1.31 60.36 46.50 7.48 88.36
Overland01 20.170 0.61 76.7 77.23 5.87 75.73
Overland02 28.165 1.42 58.43 44.87 16.75 48.35
Page 14
Subbasins
Subbasin ID: Bog01
Scenario: Existing 10-Year Depth Volume
Peak discharge: 50.7 cfs Time of peak: 01 Jan 2025, 12:09
Drainage area: 32.388 acres Total rainfall: 4.93 in 13.306 ac-ft
Initial abstraction: 1.34 in Losses: 3.05 in 8.232 ac-ft
Curve Number: 59.89 Precip excess: 1.88 in 5.074 ac-ft
Impervious surface: 17.06% Direct runoff: 1.88 in 5.074 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 6.92 minutes Total runoff: 1.88 in 5.074 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
B/D Developed, Open Space 0.271 0.84 84
B/D Developed, Low Density 1.516 4.68 85
C Developed, Low Density 0.605 1.87 80
A Undeveloped, Mixed Forest 1.121 3.46 36
B/D Wetlands, Forested 3.028 9.35 78
A Developed, Medium Density 4.699 14.51 61
A Developed, High Density 0.332 1.03 81
A Undeveloped, Grassland 3.753 11.59 50
B/D Developed, Medium Density 0.164 0.51 85
B/D Undeveloped, Grassland 0.479 1.48 84
A Developed, Low Density 2.678 8.27 57
A Wetlands, Non-Forested 3.07 9.48 30
A Developed, Open Space 0.164 0.51 49
A Wetlands, Forested 3.468 10.71 30
C Developed, High Density 0.079 0.24 80
B/D Wetlands, Non-Forested 5.957 18.39 78
B/D Undeveloped, Mixed Forest 0.37 1.14 79
C Developed, Medium Density 0.633 1.95 80
Weighted
Average
32.388 100 59.89
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
2.86 14 0.05672 0.0817 Sheet Flow
0.12 54.41 0.22968 7.7303 Shallow Concentrated Flow
8.55 350.08 0.0014 0.6821 Channel Flow
11.53 418.49 Total Lag Time = 6.92 minutes
Page 15
Page 16
Subbasin ID: Bog02
Scenario: Existing 10-Year Depth Volume
Peak discharge: 93.12 cfs Time of peak: 01 Jan 2025, 12:09
Drainage area: 50.708 acres Total rainfall: 4.93 in 20.832 ac-ft
Initial abstraction: 0.98 in Losses: 2.88 in 12.168 ac-ft
Curve Number: 67.05 Precip excess: 2.05 in 8.665 ac-ft
Impervious surface: 9.16% Direct runoff: 2.05 in 8.665 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 7.11 minutes Total runoff: 2.05 in 8.665 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
A Developed, Medium Density 2.754 5.43 61
B/D Undeveloped, Mixed Forest 0.086 0.17 79
B/D Wetlands, Non-Forested 13.346 26.32 78
B/D Developed, Medium Density 0.131 0.26 85
B/D Wetlands, Forested 14.844 29.27 78
A Undeveloped, Mixed Forest 1.432 2.82 36
A Developed, Open Space 1.721 3.39 49
A Wetlands, Forested 2.194 4.33 30
A Developed, Low Density 7.111 14.02 57
A Undeveloped, Grassland 2.481 4.89 50
B/D Developed, Low Density 1.491 2.94 85
A Wetlands, Non-Forested 1.938 3.82 30
B/D Developed, Open Space 0.883 1.74 84
B/D Undeveloped, Grassland 0.296 0.58 84
Weighted
Average 50.708 100 67.05
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
9.44 22.17 0.00717 0.0392 Sheet Flow
2.41 419.38 0.02038 2.9023 Shallow Concentrated Flow
0 1 0.03884 3.5925 Channel Flow
11.85 442.55 Total Lag Time = 7.11 minutes
Page 17
Page 18
Subbasin ID: Bog03
Scenario: Existing 10-Year Depth Volume
Peak discharge: 59.95 cfs Time of peak: 01 Jan 2025, 12:07
Drainage area: 30.023 acres Total rainfall: 4.93 in 12.335 ac-ft
Initial abstraction: 1.27 in Losses: 2.7 in 6.761 ac-ft
Curve Number: 61.10 Precip excess: 2.23 in 5.574 ac-ft
Impervious surface: 24.81% Direct runoff: 2.23 in 5.574 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 4.85 minutes Total runoff: 2.23 in 5.574 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
B/D Developed, Open Space 0.673 2.24 84
B/D Developed, Low Density 0.234 0.78 85
A Undeveloped, Barren Land 1.119 3.73 78
C Undeveloped, Barren Land 0.764 2.54 91
A Undeveloped, Mixed Forest 3.576 11.91 36
B/D Wetlands, Forested 0.263 0.88 78
A Developed, Medium Density 6.722 22.39 61
A Developed, High Density 0.948 3.16 81
A Undeveloped, Grassland 1.794 5.97 50
B/D Developed, Medium Density 0.006 0.02 85
B/D Undeveloped, Grassland 0.226 0.75 84
A Developed, Low Density 5.664 18.86 57
A Wetlands, Non-Forested 1.035 3.45 30
A Developed, Open Space 1.409 4.69 49
A Wetlands, Forested 0.242 0.81 30
C Developed, High Density 0.015 0.05 80
A Open Water 0.218 0.72 98
B/D Wetlands, Non-Forested 4.421 14.72 78
B/D Undeveloped, Mixed Forest 0.526 1.75 79
C Open Water 0.171 0.57 98
Weighted
Average
30.023 100 61.1
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
7.27 28.71 0.02306 0.0658 Sheet Flow
0.78 183.6 0.05947 3.9335 Shallow Concentrated Flow
0.03 6.07 0.03705 3.5087 Channel Flow
8.08 218.38 Total Lag Time = 4.85 minutes
Page 19
Page 20
Subbasin ID: Bog04
Scenario: Existing 10-Year Depth Volume
Peak discharge: 88.36 cfs Time of peak: 01 Jan 2025, 12:09
Drainage area: 36.926 acres Total rainfall: 4.93 in 15.17 ac-ft
Initial abstraction: 1.31 in Losses: 1.95 in 5.998 ac-ft
Curve Number: 60.36 Precip excess: 2.98 in 9.172 ac-ft
Impervious surface: 46.50% Direct runoff: 2.98 in 9.172 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 7.48 minutes Total runoff: 2.98 in 9.172 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
C Developed, Low Density 0.428 1.16 80
A/D Developed, Low Density 0.46 1.24 85
A Undeveloped, Barren Land 0.337 0.91 78
C Undeveloped, Barren Land 0.093 0.25 91
A/D Developed, Medium Density 0.674 1.83 85
B/D Wetlands, Forested 0 0 78
A Developed, Medium Density 17.573 47.59 61
A Developed, High Density 1.54 4.17 81
A/D Developed, High Density 0.067 0.18 85
A/D Developed, Open Space 0.255 0.69 84
A Developed, Low Density 7.312 19.8 57
A Wetlands, Non-Forested 0.159 0.43 30
A Developed, Open Space 6.145 16.64 49
A Wetlands, Forested 0.767 2.08 30
C Developed, High Density 0.099 0.27 80
C Developed, Medium Density 0.768 2.08 80
A Open Water 0.248 0.67 98
Weighted
Average
36.926 100 60.36
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
11.38 76.25 0.05316 0.1117 Sheet Flow
0.91 202.74 0.03317 3.7026 Shallow Concentrated Flow
0.17 29.1 0.02473 2.8666 Channel Flow
12.46 308.09 Total Lag Time = 7.48 minutes
Page 21
Page 22
Subbasin ID: Overland01
Scenario: Existing 10-Year Depth Volume
Peak discharge: 75.73 cfs Time of peak: 01 Jan 2025, 12:07
Drainage area: 20.17 acres Total rainfall: 4.93 in 8.287 ac-ft
Initial abstraction: 0.61 in Losses: 0.55 in 0.916 ac-ft
Curve Number: 76.70 Precip excess: 4.38 in 7.371 ac-ft
Impervious surface: 77.23% Direct runoff: 4.38 in 7.371 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 5.87 minutes Total runoff: 4.38 in 7.371 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
A Developed, Medium Density 1.579 7.83 61
A Developed, High Density 4.211 20.88 81
C Developed, High Density 6.514 32.3 80
B/D Wetlands, Forested 0.001 0 78
A Undeveloped, Mixed Forest 0.151 0.75 36
A Developed, Open Space 0.208 1.03 49
A Wetlands, Forested 0.077 0.38 30
A Developed, Low Density 1.04 5.16 57
C Developed, Low Density 0.354 1.75 80
C Developed, Medium Density 6.034 29.92 80
Weighted
Average 20.17 100 76.7
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
2.17 163.33 0.02158 1.2543 Sheet Flow
7.35 921.92 0.01058 2.0911 Shallow Concentrated Flow
0.26 166.51 0.03936 10.8493 Channel Flow
9.78 1251.76 Total Lag Time = 5.87 minutes
Page 23
Subbasin ID: Overland02
Scenario: Existing 10-Year Depth Volume
Peak discharge: 48.35 cfs Time of peak: 01 Jan 2025, 12:19
Drainage area: 28.165 acres Total rainfall: 4.93 in 11.571 ac-ft
Initial abstraction: 1.42 in Losses: 2.08 in 4.879 ac-ft
Curve Number: 58.43 Precip excess: 2.85 in 6.692 ac-ft
Impervious surface: 44.87% Direct runoff: 2.85 in 6.692 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 16.75 minutes Total runoff: 2.85 in 6.692 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
A Developed, High Density 1.066 3.78 81
A Developed, Medium Density 12.337 43.8 61
B/D Developed, Medium Density 0.052 0.18 85
A Undeveloped, Mixed Forest 0.822 2.92 36
A Developed, Open Space 0.613 2.18 49
A Wetlands, Forested 0.237 0.84 30
A Developed, Low Density 11.273 40.02 57
A Undeveloped, Grassland 1.627 5.78 50
A Wetlands, Non-Forested 0.002 0.01 30
B/D Developed, Low Density 0.136 0.48 85
Weighted
Average 28.165 100 58.43
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
16.8 90 0.02793 0.0893 Sheet Flow
11.03 1203.28 0.01271 1.8185 Shallow Concentrated Flow
0.09 23.15 0.05811 4.2184 Channel Flow
27.92 1316.43 Total Lag Time = 16.75 minutes
Page 24
Page 25
Existing 50-Year
Watershed Summary
Subbasin
ID
Drainage
Area
(acres)
Initial
Abstraction
(in)
Curve
Number
Impervious
Surface
(%)
Lag
Time
(minutes)
Peak
Discharge
(cfs)
Bog01 32.388 1.34 59.89 17.06 6.92 87.63
Bog02 50.708 0.98 67.05 9.16 7.11 156.87
Bog03 30.023 1.27 61.1 24.81 4.85 97.93
Bog04 36.926 1.31 60.36 46.50 7.48 132.93
Overland01 20.170 0.61 76.7 77.23 5.87 104.54
Overland02 28.165 1.42 58.43 44.87 16.75 73.44
Page 26
Subbasins
Subbasin ID: Bog01
Scenario: Existing 50-Year Depth Volume
Peak discharge: 87.63 cfs Time of peak: 01 Jan 2025, 12:09
Drainage area: 32.388 acres Total rainfall: 6.63 in 17.894 ac-ft
Initial abstraction: 1.34 in Losses: 3.56 in 9.616 ac-ft
Curve Number: 59.89 Precip excess: 3.07 in 8.279 ac-ft
Impervious surface: 17.06% Direct runoff: 3.07 in 8.279 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 6.92 minutes Total runoff: 3.07 in 8.279 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
B/D Developed, Open Space 0.271 0.84 84
B/D Developed, Low Density 1.516 4.68 85
C Developed, Low Density 0.605 1.87 80
A Undeveloped, Mixed Forest 1.121 3.46 36
B/D Wetlands, Forested 3.028 9.35 78
A Developed, Medium Density 4.699 14.51 61
A Developed, High Density 0.332 1.03 81
A Undeveloped, Grassland 3.753 11.59 50
B/D Developed, Medium Density 0.164 0.51 85
B/D Undeveloped, Grassland 0.479 1.48 84
A Developed, Low Density 2.678 8.27 57
A Wetlands, Non-Forested 3.07 9.48 30
A Developed, Open Space 0.164 0.51 49
A Wetlands, Forested 3.468 10.71 30
C Developed, High Density 0.079 0.24 80
B/D Wetlands, Non-Forested 5.957 18.39 78
B/D Undeveloped, Mixed Forest 0.37 1.14 79
C Developed, Medium Density 0.633 1.95 80
Weighted
Average
32.388 100 59.89
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
2.86 14 0.05672 0.0817 Sheet Flow
0.12 54.41 0.22968 7.7303 Shallow Concentrated Flow
8.55 350.08 0.0014 0.6821 Channel Flow
11.53 418.49 Total Lag Time = 6.92 minutes
Page 27
Page 28
Subbasin ID: Bog02
Scenario: Existing 50-Year Depth Volume
Peak discharge: 156.87 cfs Time of peak: 01 Jan 2025, 12:09
Drainage area: 50.708 acres Total rainfall: 6.63 in 28.016 ac-ft
Initial abstraction: 0.98 in Losses: 3.28 in 13.851 ac-ft
Curve Number: 67.05 Precip excess: 3.35 in 14.166 ac-ft
Impervious surface: 9.16% Direct runoff: 3.35 in 14.166 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 7.11 minutes Total runoff: 3.35 in 14.166 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
A Developed, Medium Density 2.754 5.43 61
B/D Undeveloped, Mixed Forest 0.086 0.17 79
B/D Wetlands, Non-Forested 13.346 26.32 78
B/D Developed, Medium Density 0.131 0.26 85
B/D Wetlands, Forested 14.844 29.27 78
A Undeveloped, Mixed Forest 1.432 2.82 36
A Developed, Open Space 1.721 3.39 49
A Wetlands, Forested 2.194 4.33 30
A Developed, Low Density 7.111 14.02 57
A Undeveloped, Grassland 2.481 4.89 50
B/D Developed, Low Density 1.491 2.94 85
A Wetlands, Non-Forested 1.938 3.82 30
B/D Developed, Open Space 0.883 1.74 84
B/D Undeveloped, Grassland 0.296 0.58 84
Weighted
Average 50.708 100 67.05
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
9.44 22.17 0.00717 0.0392 Sheet Flow
2.41 419.38 0.02038 2.9023 Shallow Concentrated Flow
0 1 0.03884 3.5925 Channel Flow
11.85 442.55 Total Lag Time = 7.11 minutes
Page 29
Page 30
Subbasin ID: Bog03
Scenario: Existing 50-Year Depth Volume
Peak discharge: 97.93 cfs Time of peak: 01 Jan 2025, 12:07
Drainage area: 30.023 acres Total rainfall: 6.63 in 16.588 ac-ft
Initial abstraction: 1.27 in Losses: 3.14 in 7.864 ac-ft
Curve Number: 61.10 Precip excess: 3.49 in 8.724 ac-ft
Impervious surface: 24.81% Direct runoff: 3.49 in 8.724 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 4.85 minutes Total runoff: 3.49 in 8.724 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
B/D Developed, Open Space 0.673 2.24 84
B/D Developed, Low Density 0.234 0.78 85
A Undeveloped, Barren Land 1.119 3.73 78
C Undeveloped, Barren Land 0.764 2.54 91
A Undeveloped, Mixed Forest 3.576 11.91 36
B/D Wetlands, Forested 0.263 0.88 78
A Developed, Medium Density 6.722 22.39 61
A Developed, High Density 0.948 3.16 81
A Undeveloped, Grassland 1.794 5.97 50
B/D Developed, Medium Density 0.006 0.02 85
B/D Undeveloped, Grassland 0.226 0.75 84
A Developed, Low Density 5.664 18.86 57
A Wetlands, Non-Forested 1.035 3.45 30
A Developed, Open Space 1.409 4.69 49
A Wetlands, Forested 0.242 0.81 30
C Developed, High Density 0.015 0.05 80
A Open Water 0.218 0.72 98
B/D Wetlands, Non-Forested 4.421 14.72 78
B/D Undeveloped, Mixed Forest 0.526 1.75 79
C Open Water 0.171 0.57 98
Weighted
Average
30.023 100 61.1
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
7.27 28.71 0.02306 0.0658 Sheet Flow
0.78 183.6 0.05947 3.9335 Shallow Concentrated Flow
0.03 6.07 0.03705 3.5087 Channel Flow
8.08 218.38 Total Lag Time = 4.85 minutes
Page 31
Page 32
Subbasin ID: Bog04
Scenario: Existing 50-Year Depth Volume
Peak discharge: 132.93 cfs Time of peak: 01 Jan 2025, 12:09
Drainage area: 36.926 acres Total rainfall: 6.63 in 20.402 ac-ft
Initial abstraction: 1.31 in Losses: 2.27 in 6.995 ac-ft
Curve Number: 60.36 Precip excess: 4.36 in 13.406 ac-ft
Impervious surface: 46.50% Direct runoff: 4.36 in 13.406 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 7.48 minutes Total runoff: 4.36 in 13.406 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
C Developed, Low Density 0.428 1.16 80
A/D Developed, Low Density 0.46 1.24 85
A Undeveloped, Barren Land 0.337 0.91 78
C Undeveloped, Barren Land 0.093 0.25 91
A/D Developed, Medium Density 0.674 1.83 85
B/D Wetlands, Forested 0 0 78
A Developed, Medium Density 17.573 47.59 61
A Developed, High Density 1.54 4.17 81
A/D Developed, High Density 0.067 0.18 85
A/D Developed, Open Space 0.255 0.69 84
A Developed, Low Density 7.312 19.8 57
A Wetlands, Non-Forested 0.159 0.43 30
A Developed, Open Space 6.145 16.64 49
A Wetlands, Forested 0.767 2.08 30
C Developed, High Density 0.099 0.27 80
C Developed, Medium Density 0.768 2.08 80
A Open Water 0.248 0.67 98
Weighted
Average
36.926 100 60.36
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
11.38 76.25 0.05316 0.1117 Sheet Flow
0.91 202.74 0.03317 3.7026 Shallow Concentrated Flow
0.17 29.1 0.02473 2.8666 Channel Flow
12.46 308.09 Total Lag Time = 7.48 minutes
Page 33
Page 34
Subbasin ID: Overland01
Scenario: Existing 50-Year Depth Volume
Peak discharge: 104.54 cfs Time of peak: 01 Jan 2025, 12:07
Drainage area: 20.17 acres Total rainfall: 6.63 in 11.144 ac-ft
Initial abstraction: 0.61 in Losses: 0.6 in 1.006 ac-ft
Curve Number: 76.70 Precip excess: 6.03 in 10.138 ac-ft
Impervious surface: 77.23% Direct runoff: 6.03 in 10.138 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 5.87 minutes Total runoff: 6.03 in 10.138 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
A Developed, Medium Density 1.579 7.83 61
A Developed, High Density 4.211 20.88 81
C Developed, High Density 6.514 32.3 80
B/D Wetlands, Forested 0.001 0 78
A Undeveloped, Mixed Forest 0.151 0.75 36
A Developed, Open Space 0.208 1.03 49
A Wetlands, Forested 0.077 0.38 30
A Developed, Low Density 1.04 5.16 57
C Developed, Low Density 0.354 1.75 80
C Developed, Medium Density 6.034 29.92 80
Weighted
Average 20.17 100 76.7
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
2.17 163.33 0.02158 1.2543 Sheet Flow
7.35 921.92 0.01058 2.0911 Shallow Concentrated Flow
0.26 166.51 0.03936 10.8493 Channel Flow
9.78 1251.76 Total Lag Time = 5.87 minutes
Page 35
Page 36
Subbasin ID: Overland02
Scenario: Existing 50-Year Depth Volume
Peak discharge: 73.44 cfs Time of peak: 01 Jan 2025, 12:19
Drainage area: 28.165 acres Total rainfall: 6.63 in 15.561 ac-ft
Initial abstraction: 1.42 in Losses: 2.44 in 5.729 ac-ft
Curve Number: 58.43 Precip excess: 4.19 in 9.832 ac-ft
Impervious surface: 44.87% Direct runoff: 4.19 in 9.832 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 16.75 minutes Total runoff: 4.19 in 9.832 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
A Developed, High Density 1.066 3.78 81
A Developed, Medium Density 12.337 43.8 61
B/D Developed, Medium Density 0.052 0.18 85
A Undeveloped, Mixed Forest 0.822 2.92 36
A Developed, Open Space 0.613 2.18 49
A Wetlands, Forested 0.237 0.84 30
A Developed, Low Density 11.273 40.02 57
A Undeveloped, Grassland 1.627 5.78 50
A Wetlands, Non-Forested 0.002 0.01 30
B/D Developed, Low Density 0.136 0.48 85
Weighted
Average 28.165 100 58.43
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
16.8 90 0.02793 0.0893 Sheet Flow
11.03 1203.28 0.01271 1.8185 Shallow Concentrated Flow
0.09 23.15 0.05811 4.2184 Channel Flow
27.92 1316.43 Total Lag Time = 16.75 minutes
Page 37
Existing 100-Year
Watershed Summary
Subbasin
ID
Drainage
Area
(acres)
Initial
Abstraction
(in)
Curve
Number
Impervious
Surface
(%)
Lag
Time
(minutes)
Peak
Discharge
(cfs)
Bog01 32.388 1.34 59.89 17.06 6.92 105.44
Bog02 50.708 0.98 67.05 9.16 7.11 186.94
Bog03 30.023 1.27 61.1 24.81 4.85 116.01
Bog04 36.926 1.31 60.36 46.50 7.48 153.79
Overland01 20.170 0.61 76.7 77.23 5.87 117.48
Overland02 28.165 1.42 58.43 44.87 16.75 85.26
Page 38
Subbasins
Subbasin ID: Bog01
Scenario: Existing 100-Year Depth Volume
Peak discharge: 105.44 cfs Time of peak: 01 Jan 2025, 12:09
Drainage area: 32.388 acres Total rainfall: 7.39 in 19.946 ac-ft
Initial abstraction: 1.34 in Losses: 3.75 in 10.115 ac-ft
Curve Number: 59.89 Precip excess: 3.64 in 9.83 ac-ft
Impervious surface: 17.06% Direct runoff: 3.64 in 9.83 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 6.92 minutes Total runoff: 3.64 in 9.83 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
B/D Developed, Open Space 0.271 0.84 84
B/D Developed, Low Density 1.516 4.68 85
C Developed, Low Density 0.605 1.87 80
A Undeveloped, Mixed Forest 1.121 3.46 36
B/D Wetlands, Forested 3.028 9.35 78
A Developed, Medium Density 4.699 14.51 61
A Developed, High Density 0.332 1.03 81
A Undeveloped, Grassland 3.753 11.59 50
B/D Developed, Medium Density 0.164 0.51 85
B/D Undeveloped, Grassland 0.479 1.48 84
A Developed, Low Density 2.678 8.27 57
A Wetlands, Non-Forested 3.07 9.48 30
A Developed, Open Space 0.164 0.51 49
A Wetlands, Forested 3.468 10.71 30
C Developed, High Density 0.079 0.24 80
B/D Wetlands, Non-Forested 5.957 18.39 78
B/D Undeveloped, Mixed Forest 0.37 1.14 79
C Developed, Medium Density 0.633 1.95 80
Weighted
Average
32.388 100 59.89
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
2.86 14 0.05672 0.0817 Sheet Flow
0.12 54.41 0.22968 7.7303 Shallow Concentrated Flow
8.55 350.08 0.0014 0.6821 Channel Flow
11.53 418.49 Total Lag Time = 6.92 minutes
Page 39
Page 40
Subbasin ID: Bog02
Scenario: Existing 100-Year Depth Volume
Peak discharge: 186.94 cfs Time of peak: 01 Jan 2025, 12:09
Drainage area: 50.708 acres Total rainfall: 7.39 in 31.228 ac-ft
Initial abstraction: 0.98 in Losses: 3.42 in 14.439 ac-ft
Curve Number: 67.05 Precip excess: 3.97 in 16.788 ac-ft
Impervious surface: 9.16% Direct runoff: 3.97 in 16.788 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 7.11 minutes Total runoff: 3.97 in 16.788 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
A Developed, Medium Density 2.754 5.43 61
B/D Undeveloped, Mixed Forest 0.086 0.17 79
B/D Wetlands, Non-Forested 13.346 26.32 78
B/D Developed, Medium Density 0.131 0.26 85
B/D Wetlands, Forested 14.844 29.27 78
A Undeveloped, Mixed Forest 1.432 2.82 36
A Developed, Open Space 1.721 3.39 49
A Wetlands, Forested 2.194 4.33 30
A Developed, Low Density 7.111 14.02 57
A Undeveloped, Grassland 2.481 4.89 50
B/D Developed, Low Density 1.491 2.94 85
A Wetlands, Non-Forested 1.938 3.82 30
B/D Developed, Open Space 0.883 1.74 84
B/D Undeveloped, Grassland 0.296 0.58 84
Weighted
Average 50.708 100 67.05
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
9.44 22.17 0.00717 0.0392 Sheet Flow
2.41 419.38 0.02038 2.9023 Shallow Concentrated Flow
0 1 0.03884 3.5925 Channel Flow
11.85 442.55 Total Lag Time = 7.11 minutes
Page 41
Page 42
Subbasin ID: Bog03
Scenario: Existing 100-Year Depth Volume
Peak discharge: 116.01 cfs Time of peak: 01 Jan 2025, 12:07
Drainage area: 30.023 acres Total rainfall: 7.39 in 18.49 ac-ft
Initial abstraction: 1.27 in Losses: 3.3 in 8.259 ac-ft
Curve Number: 61.10 Precip excess: 4.09 in 10.23 ac-ft
Impervious surface: 24.81% Direct runoff: 4.09 in 10.23 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 4.85 minutes Total runoff: 4.09 in 10.23 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
B/D Developed, Open Space 0.673 2.24 84
B/D Developed, Low Density 0.234 0.78 85
A Undeveloped, Barren Land 1.119 3.73 78
C Undeveloped, Barren Land 0.764 2.54 91
A Undeveloped, Mixed Forest 3.576 11.91 36
B/D Wetlands, Forested 0.263 0.88 78
A Developed, Medium Density 6.722 22.39 61
A Developed, High Density 0.948 3.16 81
A Undeveloped, Grassland 1.794 5.97 50
B/D Developed, Medium Density 0.006 0.02 85
B/D Undeveloped, Grassland 0.226 0.75 84
A Developed, Low Density 5.664 18.86 57
A Wetlands, Non-Forested 1.035 3.45 30
A Developed, Open Space 1.409 4.69 49
A Wetlands, Forested 0.242 0.81 30
C Developed, High Density 0.015 0.05 80
A Open Water 0.218 0.72 98
B/D Wetlands, Non-Forested 4.421 14.72 78
B/D Undeveloped, Mixed Forest 0.526 1.75 79
C Open Water 0.171 0.57 98
Weighted
Average
30.023 100 61.1
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
7.27 28.71 0.02306 0.0658 Sheet Flow
0.78 183.6 0.05947 3.9335 Shallow Concentrated Flow
0.03 6.07 0.03705 3.5087 Channel Flow
8.08 218.38 Total Lag Time = 4.85 minutes
Page 43
Page 44
Subbasin ID: Bog04
Scenario: Existing 100-Year Depth Volume
Peak discharge: 153.79 cfs Time of peak: 01 Jan 2025, 12:09
Drainage area: 36.926 acres Total rainfall: 7.39 in 22.74 ac-ft
Initial abstraction: 1.31 in Losses: 2.39 in 7.354 ac-ft
Curve Number: 60.36 Precip excess: 5 in 15.386 ac-ft
Impervious surface: 46.50% Direct runoff: 5 in 15.386 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 7.48 minutes Total runoff: 5 in 15.386 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
C Developed, Low Density 0.428 1.16 80
A/D Developed, Low Density 0.46 1.24 85
A Undeveloped, Barren Land 0.337 0.91 78
C Undeveloped, Barren Land 0.093 0.25 91
A/D Developed, Medium Density 0.674 1.83 85
B/D Wetlands, Forested 0 0 78
A Developed, Medium Density 17.573 47.59 61
A Developed, High Density 1.54 4.17 81
A/D Developed, High Density 0.067 0.18 85
A/D Developed, Open Space 0.255 0.69 84
A Developed, Low Density 7.312 19.8 57
A Wetlands, Non-Forested 0.159 0.43 30
A Developed, Open Space 6.145 16.64 49
A Wetlands, Forested 0.767 2.08 30
C Developed, High Density 0.099 0.27 80
C Developed, Medium Density 0.768 2.08 80
A Open Water 0.248 0.67 98
Weighted
Average
36.926 100 60.36
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
11.38 76.25 0.05316 0.1117 Sheet Flow
0.91 202.74 0.03317 3.7026 Shallow Concentrated Flow
0.17 29.1 0.02473 2.8666 Channel Flow
12.46 308.09 Total Lag Time = 7.48 minutes
Page 45
Page 46
Subbasin ID: Overland01
Scenario: Existing 100-Year Depth Volume
Peak discharge: 117.48 cfs Time of peak: 01 Jan 2025, 12:07
Drainage area: 20.17 acres Total rainfall: 7.39 in 12.422 ac-ft
Initial abstraction: 0.61 in Losses: 0.62 in 1.036 ac-ft
Curve Number: 76.70 Precip excess: 6.77 in 11.385 ac-ft
Impervious surface: 77.23% Direct runoff: 6.77 in 11.385 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 5.87 minutes Total runoff: 6.77 in 11.385 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
A Developed, Medium Density 1.579 7.83 61
A Developed, High Density 4.211 20.88 81
C Developed, High Density 6.514 32.3 80
B/D Wetlands, Forested 0.001 0 78
A Undeveloped, Mixed Forest 0.151 0.75 36
A Developed, Open Space 0.208 1.03 49
A Wetlands, Forested 0.077 0.38 30
A Developed, Low Density 1.04 5.16 57
C Developed, Low Density 0.354 1.75 80
C Developed, Medium Density 6.034 29.92 80
Weighted
Average 20.17 100 76.7
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
2.17 163.33 0.02158 1.2543 Sheet Flow
7.35 921.92 0.01058 2.0911 Shallow Concentrated Flow
0.26 166.51 0.03936 10.8493 Channel Flow
9.78 1251.76 Total Lag Time = 5.87 minutes
Page 47
Subbasin ID: Overland02
Scenario: Existing 100-Year Depth Volume
Peak discharge: 85.26 cfs Time of peak: 01 Jan 2025, 12:19
Drainage area: 28.165 acres Total rainfall: 7.39 in 17.345 ac-ft
Initial abstraction: 1.42 in Losses: 2.57 in 6.038 ac-ft
Curve Number: 58.43 Precip excess: 4.82 in 11.307 ac-ft
Impervious surface: 44.87% Direct runoff: 4.82 in 11.307 ac-ft
Peaking factor: 484 Baseflow: 0 in 0 ac-ft
Lag time: 16.75 minutes Total runoff: 4.82 in 11.307 ac-ft
Weighted Curve Number Calculations
Soil Group Land Use Description Area (acres) Area (%) Composite CN
A Developed, High Density 1.066 3.78 81
A Developed, Medium Density 12.337 43.8 61
B/D Developed, Medium Density 0.052 0.18 85
A Undeveloped, Mixed Forest 0.822 2.92 36
A Developed, Open Space 0.613 2.18 49
A Wetlands, Forested 0.237 0.84 30
A Developed, Low Density 11.273 40.02 57
A Undeveloped, Grassland 1.627 5.78 50
A Wetlands, Non-Forested 0.002 0.01 30
B/D Developed, Low Density 0.136 0.48 85
Weighted
Average 28.165 100 58.43
Time of Concentration (TOC) / Lag time Calculations
TOC (min) Length (ft) Slope (ft/ft) Velocity (ft/s) Description
16.8 90 0.02793 0.0893 Sheet Flow
11.03 1203.28 0.01271 1.8185 Shallow Concentrated Flow
0.09 23.15 0.05811 4.2184 Channel Flow
27.92 1316.43 Total Lag Time = 16.75 minutes
Page 48
Appendix B
Hydraulic Analysis Supporting Documentation
PROJ. No.:DATE:File: \\private\DFS\CadProj\DWG\P2024\0208\A10\Civil\Plan\20240208A10_COV01.dwg Layout: GI-001 Plotted: 2025-11-11 5:32 PM Saved: 2025-11-11 4:24 PM User: Allyson.Fairweather
GI-00120240208.A10NOVEMBER 11, 2025DRAFT - NOT FOR CONSTRUCTIONBAYVIEW BOGS WETLAND RESTORATIONBAYVIEW BOGS · YARMOUTH · MADRAFT PERMIT SETNOVEMBER 11, 2025REVISED: N/APREPARED BY1550 MAIN STREET, SUITE 400SPRINGFIELD, MA 01103413.452.0445www.fando.comPREPARED FORCAPE COD CONSERVATION DISTRICT303 MAIN STREETWEST YARMOUTH, MA 02673PROJECT TEAMCAPE COD CONSERVATION DISTRICT303 MAIN STREETWEST YARMOUTH, MA 02673MA DER100 CAMBRIDGE STREET6TH FLOORBOSTON, MA 02114CAPE COD HEALTHCARE27 PARK STREETHYANNIS, MA 02601SHEET INDEXSheet no.Sheet TitleGI-001COVER SHEETGI-002KEY PLAN & GENERAL NOTESEC-101EXISTING CONDITIONS PLAN (1 OF 2)EC-102EXISTING CONDITIONS PLAN (2 OF 2)CE-101EROSION & SEDIMENT CONTROL PLAN (1 OF 2)CE-102EROSION & SEDIMENT CONTROL PLAN (2 OF 2)CG-101RESTORATION DESIGN & GRADING PLAN (1 OF 2)CG-102RESTORATION DESIGN & GRADING PLAN (2 OF 2)CS-101THERAPEUTIC LANDSCAPE AREA LAYOUT &GRADING ENLARGEMENT PLANLP-101THERAPEUTIC LANDSCAPE AREA PLANTINGENLARGEMENT PLANCD-501EROSION & SEDIMENT CONTROL DETAILSCD-502 -CD-505RESTORATION DETAILSLOCATION MAPSCALE: 1" = 800'
PROJ. No.:DATE:SCALE:
DATUM:
VERT.:
HORZ.:
VERT.:
HORZ.:
MS VIEW: LAYER STATE: File: \\private\DFS\CadProj\DWG\P2024\0208\A10\Civil\Plan\20240208A10_GEN01.dwg Layout: GI-002 Plotted: 2025-11-11 5:33 PM Saved: 2025-11-10 6:30 PM User: Allyson.Fairweather
SEAL
PC3: AUTOCAD PDF (GENERAL DOCUMENTATION).PC3 STB/CTB: FO.STB
GRAPHIC SCALE
0
250'
-
NAD83 MA
NAVD88
125'250'500'
DATENo.DESCRIPTION DESIGNER REVIEWER
GI-00220240208.A10NOVEMBER 11, 2025CAPE COD CONSERVATION DISTRICT
KEY PLAN & GENERAL NOTES
BAYVIEW BOGS WETLAND
RESTORATION
YARMOUTH MASSACHUSETTSDRAFT - NOT FOR CONSTRUCTION1550 MAIN STREET, SUITE 400
SPRINGFIELD, MA 01103
413.452.0445
www.fando.com
PROJ. No.:DATE:SCALE:
DATUM:
VERT.:
HORZ.:
VERT.:
HORZ.:
MS VIEW: LAYER STATE: File: \\private\DFS\CadProj\DWG\P2024\0208\A10\Civil\Plan\20240208A10_EXC01.dwg Layout: EC-101 Plotted: 2025-11-11 5:34 PM Saved: 2025-11-11 4:29 PM User: Allyson.Fairweather
SEAL
PC3: AUTOCAD PDF (GENERAL DOCUMENTATION).PC3 STB/CTB: FO.STB
GRAPHIC SCALE
0
1" = 100'
100'50'200'
NAD83 MA
NAVD88
DATENo.DESCRIPTION DESIGNER REVIEWER
EC-10120240208.A10NOVEMBER 11, 2025CAPE COD CONSERVATION DISTRICT
EXISTING CONDITIONS (1 OF 2)
BAYVIEW BOGS WETLAND
RESTORATION
YARMOUTH MASSACHUSETTSDRAFT - NOT FOR CONSTRUCTION1550 MAIN STREET, SUITE 400
SPRINGFIELD, MA 01103
413.452.0445
www.fando.com
PROJ. No.:DATE:SCALE:
DATUM:
VERT.:
HORZ.:
VERT.:
HORZ.:
MS VIEW: LAYER STATE: File: \\private\DFS\CadProj\DWG\P2024\0208\A10\Civil\Plan\20240208A10_EXC01.dwg Layout: EXISTING CONDITIONS (2 OF 2) Plotted: 2025-11-11 5:34 PM Saved: 2025-11-11 4:29 PM User: Allyson.Fairweather
SEAL
PC3: AUTOCAD PDF (GENERAL DOCUMENTATION).PC3 STB/CTB: FO.STB
GRAPHIC SCALE
0
1" = 100'
100'50'200'
-
NAD83 MA
NAVD88
DATENo.DESCRIPTION DESIGNER REVIEWER
EC-10220240208.A10NOVEMBER 11, 2025CAPE COD CONSERVATION DISTRICT
EXISTING CONDITIONS (2 OF 2)
BAYVIEW BOGS WETLAND
RESTORATION
YARMOUTH MASSACHUSETTSDRAFT - NOT FOR CONSTRUCTION1550 MAIN STREET, SUITE 400
SPRINGFIELD, MA 01103
413.452.0445
www.fando.com
·····“” PROJ. No.:DATE:SCALE:
DATUM:
VERT.:
HORZ.:
VERT.:
HORZ.:
MS VIEW: LAYER STATE: File: \\private\DFS\CadProj\DWG\P2024\0208\A10\Civil\Plan\20240208A10_GRD01.dwg Layout: CG-101 Plotted: 2025-11-11 5:35 PM Saved: 2025-11-11 5:26 PM User: Allyson.Fairweather
SEAL
PC3: AUTOCAD PDF (GENERAL DOCUMENTATION).PC3 STB/CTB: FO.STB
GRAPHIC SCALE
0
1" = 100'
100'50'200'
NAD83 MA
NAVD88
DATENo.DESCRIPTION DESIGNER REVIEWER
CG-10120240208.A10NOVEMBER 11, 2025CAPE COD CONSERVATION DISTRICT
RESTORATION DESIGN & GRADING
PLAN (1 OF 2
BAYVIEW BOGS WETLAND
RESTORATION
YARMOUTH MASSACHUSETTSDRAFT - NOT FOR CONSTRUCTION1550 MAIN STREET, SUITE 400
SPRINGFIELD, MA 01103
413.452.0445
www.fando.com
········PROJ. No.:DATE:SCALE:
DATUM:
VERT.:
HORZ.:
VERT.:
HORZ.:
MS VIEW: LAYER STATE: File: \\private\DFS\CadProj\DWG\P2024\0208\A10\Civil\Plan\20240208A10_GRD01.dwg Layout: CG-102 Plotted: 2025-11-11 5:35 PM Saved: 2025-11-11 5:26 PM User: Allyson.Fairweather
SEAL
PC3: AUTOCAD PDF (GENERAL DOCUMENTATION).PC3 STB/CTB: FO.STB
GRAPHIC SCALE
0
1" = 100'
100'50'200'
-
NAD83 MA
NAVD88
DATENo.DESCRIPTION DESIGNER REVIEWER
CG-10220240208.A10NOVEMBER 11, 2025CAPE COD CONSERVATION DISTRICT
RESTORATION DESIGN & GRADING
PLAN (2 OF 2
BAYVIEW BOGS WETLAND
RESTORATION
YARMOUTH MASSACHUSETTSDRAFT - NOT FOR CONSTRUCTION1550 MAIN STREET, SUITE 400
SPRINGFIELD, MA 01103
413.452.0445
www.fando.com
Appendix C
Hydrologic Analysis Results