HomeMy WebLinkAboutC7.2 Post-Development Watershed Plan (8.9.23)PROPOSED CONTRIBUTORY AREA GROUNDCOVER CALCULATIONS
YARMOUTH,
SUBCATCHMENT
#
TOTAL
AREA (SF±)
GROUNDCOVER
TYPES
CURVE
NO.
AREA BY
TYPE (SF±)
WEIGHTED
CURVE NO.
M1 (RUNOFF
TO CATCH BASIN)
23,930
PAVED PARKING HSG A
98
6,286
15,144
2 500
54
>75% GRASS COVER GOOD HSG A
39
WOODS FAIR HSG A
36
M1 (RUNOFF
DIRECT TO SWALE)
7,973
>75% GRASS COVER GOOD HSG A
39
7,973
39
M2 (RUNOFF
(TO CATCH BASIN)
124,298
PAVED PARKING HSG A
98
34,244
51,000
39,054
54
>75% GRASS COVER GOOD HSG A
39
WOODS FAIR HSG A
36
M2 (RUNOFF
DIRECT TO SWALE)
55,434
PAVED PARKING HSG A
98
4,089
24,345
27,000
42
>75% GRASS COVER GOOD HSG A
39
WOODS FAIR HSG A
36
M3- ROOF RUNOFF
(PER DWELLING)
1,288
ROOFS HSG A
98
1,288
98
S1
24,985
PAVED PARKING HSG A
98
5,997
18,988
53
>75% GRASS COVER, GOOD, HSG A
39
S2
9,726
>75% GRASS COVER, GOOD, HSG A
39
9,726
39
S3
76,968
PAVED PARKING HSG A
98
2,900
47,068
27,000
40
>75% GRASS COVER, GOOD, HSG A
39
WOODS, FAIR, HSG A
36
S4
2,844
PAVED PARKING HSG A
98
791
2,053
55
>75% GRASS COVER, GOOD, HSG A
39
S5
21,459
PAVED PARKING HSG A
98
1,359
15,600
4,500
42
>75% GRASS COVER, GOOD, HSG A
39
WOODS, FAIR, HSG A
36
N1
73,924
WOODS FAIR HSG A
36
55,424
14,000
4,500
38
WOODS GRASS COMB., FAIR HSG A
43
>75% GRASS COVER GOOD HSG A
39
N4
54,094
WOODS FAIR HSG A
36
39,094
8,000
7,000
37
WOODS GRASS COMB., FAIR HSG A
43
>75% GRASS COVER GOOD HSG A
39
N5
17,701
6,000
38
> ° GRASS COVER GOOD HSG A
39
IN
362
WOODS GRASS COMB., FAIR HSG A
43
365
43 4
ONTRIBUTORY AREA LEGEND
EXISTING SUBCATCHMENT DISCHARGE / LOW POINT
- - - - - -
= MAIN SUBCATCHMENT AREA BOUNDARY
M1
= MAIN SUBCATCHMENT AREA
- - - - - - --..-..-
= SECONDARY SUBCATCHMENT AREA BOUNDARY
S1
= SECONDARY SUBCATCHMENT AREA
-----------
= NON -RECHARGE SUBCATCHMENT AREA BOUNDARY
N1
= NON -RECHARGE SUBCATCHMENT AREA
TIME OF CONCENTRATION PATHWAY
= PRE -DEVELOPMENT CATCHMENT AREA BOUNDARY
M3 = DWELLING ROOFS
NOT TO SCALE
PLAN BOOK 326 PAGE 22
ROUTE 6A 1895 S.H.L.O PLAN, SHEET 8
DEED BOOK 2776 PAGE 322
ASSESSORS' MAP 125 PARCEL 39
LEGEND
- - 32
EXISTING CONTOUR
32
PROPOSED CONTOUR
X12.34
EXISTING SPOT GRADE
24x5
PROPOSED SPOT GRADE
- W-
WATER SERVICE LINE
-E-
UNDERGROUND ELECTRIC SERVICE
IP
TEST HOLE / BORING LOCATION
ST
SEPTIC TANK
DB
DISTRIBUTION BOX
O�j � Top of Mass Highway Bound SAS SOIL ABSORPTION SYSTEM
Mass. Coord. System: Reserve RESERVED FOR FUTURE
/ N: 27208 4.30
E: 272 847.7 CobUTILITY POLE
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UTO WATER EASEMENT
-
� ELECTRICAL EASEMENT ASEMENT
so' WIDE 1?o
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0 50 100 150
SCALE 1" = 50'
G:\AAJobs\THE DAVENPORT COMPANY -ROUTE 6A-YARMOUTHPORT\DWG\Definitive Site PIans.dwg
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00
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N
IW
Top of Concrete Bound
Mass. Coord. System:
N: 2720127.39
E: 1007783.51
NAVD88 Datum:
EL=29.1±
r
CB,
FND
C702
THE DAVENPORT COMPANIES
20 NORTH MAIN STREET, YARMOUTH, MA
POST -DEVELOPMENT WATERSHED PLAN
LOT 2- ROUTE 6A- YARMOUTH-PORT, MA
o� �� J.M. OTEILLY & ASSOCIATES, INC.
�OQ�� Professional Engineering & Land Surveying Services
1573 Main Street - Route 6A
P.O. Box 1773
(508)896-6601 Office Brewster, MA 02631 (508)896-6602 Fax
DATE: SCALE: BY: CHECK: JOB NUMBER:
8/9/2023 As Noted RFR JMO JMO-8807