HomeMy WebLinkAboutC7.2 Post-Development Watershed Plan (9.7.23)PROPOSED CONTRIBUTORY AREA GROUNDCOVER CALCULATIONS
W A nn A/ll ITI I
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
>7S% GRASS COVER GOOD HSG A
39
IN
362
WOODS GRASS COMB., FAIR HSG A
43
365
43 4
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CS
ID (J)
l 1
CONTRIBUTORY 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 CATCHMENTAREA BOUNDARY
Woods/Grass Combination,
Fair, HSG A \ '
Woods, Fair, HSG A ;
(APO
�4P
Xc, \ Top of Mass Highway Bou
Mass. Coord. System:
N: 2720847.75
E: 1006864.30
Qa �/ NAVD88 Datum:
E L=53.4±
Impervious Area °o
(Roadways, Dwellings)
Q�
Impervious Area
(Driveways)
>75% Grass Cover,
Good, HSG A
M3 = DWELLING ROOFS
I MA
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
SAS
SOIL ABSORPTION SYSTEM
Reserve
RESERVED FOR FUTURE
Cob
UTILITY POLE
®
CATCH BASIN
2c'
FIRE HYDRANT
0
DRAINAGE MANHOLE
s Back of Be ■ CONCRETE BOUND, FOUND
� �
IN --- -x-x- LIMIT OF WORK
P D (CL 0 CL)- Paved
- .-40 .09'TOHOCKANO --�- -- --_ Drive FENCE
i _RH�1- �A-----� ---- - _ s
Ra fo Berm �2 L_-- - , T-��_ \ GUARDRAILS
% 40 Wide- Sta eHighway) / - _� EDGE OF CLEARING
/ y 4 - 52_ 430.06
Ed e of Pavement
-
Back of B� T 4 T L'�T-��T�% ' / / "i �/ / ' -
ARD RE die ° Pav
/'////,, ' 48x5 Q ACII(CLTO enlent
x , Paved CLI
�� 5s
J
Daiv 58m u
-_-__--_---
57
CD
LU
/
vu> �� \ ` 60
/ / l
w � %% o
ILL
/
D/ I /
�
moo //mow A
o N
le
Z00
oe
,/'� m , 60
I / 7 /
'�' °p/a
58
SLIL
LU
L
/,, / `moo � ♦ I - / / / /
_-A A
3Co
lzLP
40
0
/
'�/
v v
u
If
If
Ln FOPL_6S G. ,� 4 /' /// // xv
4BR D
EL
-OF E z6S.0,
7 /NG
ELECTRICAL EASEMENT
1801 WIDE
-- - *N
_ / A
_ e ated Wetland �
/ EdBe of Ve6 Wetlands Layer) `
,dam (Per Mass GIS DEP
All,
Y
00
12o
/ i EI LEE, "
(40' Town Way)
68
cy TOWN OF YARMO sa s6 s4 s2 so
UTH WATER EASEMENT
o
W
00
�o
N
IW
Top of Concrete Bound
Mass. Coord. System:
N: 2720127.39
E: 1007783.51
NAVD88 Datum:
EL=29.1±
CB,
FND
200.21'
C702
0 50 100 150
SCALE 1" = 50'
THE DAVENPORT COMPANIES
20 NORTH MAIN STREET, YARMOUTH, MA
POST -DEVELOPMENT WATERSHED PLAN
LOT 2- ROUTE 6A- YARMOUTH-PORT, MA
S&-vov� J.M. OTEILLY & ASSOCIATES, INC.
�OQ�� Professional Engineering & Land Surveying Services
�#2936C
G:\AAJobs\THE DAVENPORT COMPANY -ROUTE 6A-YARMOUTHPORT\DWG\Definitive Site Plans.dwg
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:
9/7/2023 As Noted RFR JMO JMO-8807