HomeMy WebLinkAbout1994-08-16 Stormwater Report i
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Hydrologic Analysis
For
sco Drug
525 Salem Turnpike
North Andover,' MA
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TABLE OF CONTENTS
1. Introduction
2. USGS Map
. Soil Conservation Service Soils Map
4. Rainfall Data Maps
S. 2 Year Storm - Existing Conditions
. 10 Year Storm - Existing Conditions
7. 100 Year Storm - Existing Conditions
. 2 Year Storm - Post Development.
. 10 Year Storm - Post Development
10. 100 Year Storm - Post Development
11. Drainage Calculations for Wiped Systems
11. Drainage Area Site Plan - Existing Conditions
12. DrAinage Area Site Plan W Proposed Conditions
Introduction
The existing site is located at 525 Salem Turnpike, North Andover, Massachusetts and is
parcel No. 63 and No. 12 according to the assessors map. The site is approximately 2.7
acres in size and is developed with a church and school with a parking lot for approximately
126 vehicles. The soils are Ridgebury series, Ridgebury fine sandy loam, Whitman series,
Whitman loam, and Woodbridge series, Woodbridge fine sandy loam. The hydrologic soil
groups for these sails is hydrologic soil group C for the Ridgebury and Woodbridge series
and hydrologic soil group D for the Whitman series. The site drains from Route 114 (Salem
Turnpike) towards a drainage s ale along Route 125 to a box culvert which rums under Route
125. The hydrologic analysis performed used this box culvert as the design point for
estimating peak rags of runoff for existing conditions and post development conditions.
The proposed project consists of a new building with a footprint of 19,500 square feet, an
existing church with a footprint of 3,400 square feet and parking for 105 vehicles. The
proposed drainage system consists of catch basins and drain manholes located within the
proposed parldng areas.
hydrologic analysis was performed for a 2 year, 10 year and 100 year storm. The results
of the analysis conclude that the pear rates of runoff from the proposed develop,nmt: will not
be increased from existing conditions. The proposed development will result in
approximately 2,000 square feet of additional impervious area. However, existing impervious
areas that are to lie rernoved are in a hydrologic soil group that drains better and as a result
the total net effect is zero increase in the peak rate of runoff and in the volume of runoff.
The peak rate of runoff from a 2 year storm is 4.7 cis; from a 10 year storm is 73 cfs; from
a 100 year storm is 11.5 cfs. The piped drainage system within the site is designed for a 25
year storm,
USGS MAP
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SITE LOCATION MAR
525 SALEM TURNPIKE (RT. 114)
FigUre I NORTH ANDOVER. MA �
trANZENGE, MA Project No. 00208-00
SOIL CONSERVATION MAP
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FEGURE B—E ,SHEET 5 OF 3
R-2 4
2 YEAR STORM
EXISTING CONDITIONS
Data for Existing conditions - 525 Salem Turnpike
Prepared by CDW Consultanto, Inc. 15 Dec 93
HyAroOAD 3.10 POU36.....01_..1986-1993 ApIalied Microcomputer Systems
SUBCATCH?lEni ' I Existing Drainage Area
ACRES -CA...
.21 70 Woods - Good Hydrologic Conditio SCS TR-20 METHOD
1.75 98 Paving & Rows TYPE III 4-IJOUR
.37 74 Lawns - Good condition RAINFALL= 3.1 IN
.36 80 Lawns -- Goad condition PEAXC 4.7 CFS @ 12. 18 IRS
2.69 90 VOLUME= .42 AF
Method Comment __........ Ta [m_in1
TR-5 5 SHEET FLOW 1 $. 5
Gr assr Short n=. 15 L�100, P2=3.1 in s=.03
SHALLOW CONCENTRATED/UPLAND FLOW 2 1.7
short Cr8a5 Pasture Kv=7 L=100, s=.02 'f' V=.99 fps
SBAI-TOW CONCEH'MWEDJIPLAND MOW 3 5.6
Grassed waterway Kv=15 Lm500' s=.01 ff " V=1.5 fps
Total Length= 700 ft Total Tc- 1S.8
UB AT H E T I RUNOFF
Ex15ting Drainage {area
AREA= 2.69 AC
4 . Tcm 15 _8 MT
C - 90
3. 9 SCS TR-20 METHOO
_ TYPE III 24-HOUR
,fl RAINFALL= 3. 1 I
�4- PEAK= 4 . 7 CFS
0 2_5 ia 12 . 15 HRS
'� UOLUME= _42 AF
2. 0
C)
-J 1 . 9
1 . 0
. 9
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T r 4n I- as M
" 10 YEAR STORM
Data for Existing conditions - 525 Salem Turnpike
Prepared by COW Consultants, Inc. 15 Dec 93
Hy!zjrp4ZPLD 3. 10 0005 0 9 5�I9 # lied Microcomputer systems
SU$CATCWfENT 1 Existing Drainage Area
.21 70 WGods - Good Hydrologic Ccriditin S S TR-20 METHOD
1.75 98 Paving & Roofs TYPE III 24-HOUR
.37 74 Lawns - Good condition RATNFALL. 4.6 IN
.36 80 Lawns - Good condition PEAK 7.7 CFS @ 12. 17 HRS
2.69 90 VOLUME= .69 AF
Method Comment
TR-55 SHEET FLOW ---- 1 8.5
Graue. Short n=.1.5 L=100' P2=3.1 in a=.03 FYI
SHALLOW CONCENTRATED/UPLAND FLOW 2 1.7
short Grass Pasture KV-7 L=100' s�.02 V=.99 fps
SHALLOW CONCENTRATED f UPLAND MOW 3 5.6
Grassed Waterway Xv=15 L=500' s=,Gl 'f ' V=1.5 €pe
Total Length= 700 ft Total Tc= 15.8
SUBCOTCHMENT I RUNOFF
Existing Drainage Area
7_
7. 0 AREA= 2. 69 PC
Tc= 15 .8 MIN
6. 5 CN= 90
6. 0 SC6 TR-20 METHOD
5. 5 TYPE III24-F OUR
5. 0 RAINFALL= 4 . 6 IN
cf- 4 . 5 PEAS(= 7 . 7 CFS
Q 4 , @ 12 . 1 7 HR5
OLUME= .69 AF
3 .
:3 3 . 1
0
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Li- 2. la
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cv M Ir its RD I- 4] In 0
TIME Lour
100 YEAR STORM
EXISTING CONDITIONS
Data for Existing conditions - 525 Salm Turnpike
Prepared by CDW Conmiltants, Inc. 15 Doe 93
H droCAD 3. 10 0Q9536 (cl 1986-1993 ARialied Microcertt uter systems
SUSCATCHMENT 1 Existing Drainage Area
ACRES CN
.21 70 Woods - Good Hydrologic Canditio $CS TR-20 METHOD
1.75 98 Paving & Roofs TYPE III 24-HOUR
.37 74 Lawns - Good condition RAINFALL= 6.5 IN
.36 80 Lawns - Good condition PEAXI 11.5 CFS @ 12.17 HRS
2.69 90 VOLUME= 1.04 AF
?49thpd Comment To
TR-55 SHEET FLOW 1 8.5
Grass: Short n=.15 L=109' P =3.1 in a-.03 'f'
SHALLOW CONCENTRATED/UPLAND FLOW 2 1.7
short Grass Pasture Kv=7 L=100' s=.02 "J' V-.99 fps
SLOW CONCENTRATED/UPLAND FLOW 3 5.6
Grassed Waterway Kv=15 L-500' 8$.01 'f' VT1.5 fps
Total Length, 700 ft Total Tc� 15.8
B AT H E T I. RUNOFF
Existing Drainage Area
AREA- 2_69 AC
Tc= 15 . 8 MIN
CN= 9j)
SC6 TR-20 METHOD
TYPE III 24-FOLJR
r RAI FALL= 6.5 IN
PEAK1, i t .5 CF5
%--' € CLU E= 1 .04 AF
5
4
L
1
fu + It is ID t m rn im
TIME hours
YEAR STORM
POST DEVELOPMENT EN
Data for Primposad Conditions - 525 salam Tarn like
Prepared bar CDW consultants, Inc. 15 Dec 93
8ydrOCAD 3.10 0GOS36 (c) 1986-1993 Applied Microcomputer Systems
SUHCATCHMENT 1 Post Development Drainage Area
.21 70 Woods - Goad Hydrologic Conditia SCS TR-20 METHOD
1.80 98 Paying hoofs TYPE 111 24-HOUR
. 16 80 Lawns - Good Condition RAINFALL 3.1 IN
. 52 74 Lawns - Good Condition PEAK= 4.7 CPS @ 12.19 HRS
2. 69 90 VOLUME- .42 A?
Method Comment Tc (min)
TR-55 SHEET FLOW 1 8.5
Graze: Short n=.15 T.=100' P2-3.1 in 8=.03 "f'
SHALIOW CONCENTRATED/UPLAND FLOW 2 1.7
Short Grass Pasture Kv=7 L. 100' 6=.02 'f` V=.99 fps
SHALLOW CONCENTRATED f UPLAND FLOW 3 S.6
Grassed Waterway Kv�15 L=500' s=.01 'f` V=1.5 fps
Total Length= 700 ft Total TC- 15.8
SUBCATCHMENT I RUNOFF
Posh. Development Drairage Area
4 .
AREA= 2 . 59 AC
Tc= 15 .8 FBI
4 . 0 CIN= 9
3. 5 5CS TR- O METHOD
TYPE III 4-HOUR
J) RAI FALL 3 . 1 I
`4-, PEAK= 4 . 7 CF5
2_5 Ca 12_ 18 HRS
VOLUMF= . 42 AF
:3 2. 0
CD
-j 1 . 5
U..
1 . 0
. 5
0. 0
m sv M � +n r- M M CDr _ _ r r r y r r%j
TIME hour 3
10 YEAR STORM
POST DEVELOPMENT
Data for Proposed Conditions - 525 Salem Turnpike
Prepared by CDW Consultants, Inc. 15 Dec 93
[ yd _pCAD....3_,.1.0_.._0005.36.---(.c) 19 6-199.. ... yp�x .1e. ..Microcomputer Systems ....__ _
SUBCATCH ENT 1 Pont Development Drainage Area
.21 70 woodn - Good Hydrologic Conditio SCS TR-20 METHOD
1.80 98 Paving & Roofs TYPE III 24-HOUR
. 16 80 lawns - Goad Condition RAINFALL 4. 6 IN
. 52 74 Lawns - Good Condition PEAK= 7.7 CF,S 0 12_17 HRS
.69 90 VOLUME- .69 AF
Method comment Tc (min)
T�Z-55 St3E1�T,,.F'L4�P,.,,.,..,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.,,.,------ 1 ._.,. 8.5
Grass: Shirt n-.15 L-100r P2=3.1 in s=.03 'f'
SHALT CONCENTRa n/UPLAND FLOW 2 1.7
Short Graes Pasture Kv=7 L. 100` 5=.02 `f' V=.99 fps
SHALT OW CONCENTRATED/UPLAND FLOW 3 5.6
Grasged w4aterway Kv=15 L=500' s=.01 V, V=1.5 fps
Total Length= 700 €t Total Tc= 15.8
UB AT HMENT I RUNOFF
Pest Development Dralnoge Area
7. 5
7. 0 AREA= 2. 69 AC
6. 5 CN= 90
6. 0 SCS TR-2e METHOD
5. 5 TYPE III 24-HOUR
5. 0 RAINFALL= 4 . 6 IN
LO
4LL 4 . 5 PEAK= 7. 7 CF5
L) 4 . a 12 . 17 FIFA$
VOLUME= . 69 WF
3 . 5
CD� 3 . 0
-J 2. 5
2. 0
1 . 5
1 . 0
5
0.
A7 T (V M � Ln to r- OD m CD
,. r r r r r r [v
TIME ( hours )
i
100 YEAR STORM
POST DEVELOPMENT
2
Data for Pro osad Conditions - 525 Salem Turnpike
Prepared by CDW consultants, Inn, 15 Dec 93
Hyde CBD....3.10 000536 (q1 1986-1993 Apiplied Mi.croroMputer Systems
SUSCAITCHMENT 1 Poat Development Vrainage Area
ACRES CN
.21 70 woods - Good Hydrologic Gonditio SCS TR-20 METHOD
1.80 98 Paving & Roofs 'TYPE III 24-HOUR
.16 SD Lawns - Good Condition PAXNVALL� 6.5 ICE
. S2--------------- Lawrie -- Good condition PEAK- 11.5 CFS a 12.17 HR5
2.69 90 VOLUME= 1.04 AF
method Comment Tu fminl
TR-555 SHMT "d0W 1 8.5
Grass: Short n-.15 L=100' P2=3.1 in e=.03
SHAL ,OW CONCENTRATSp f UFL AND FLOW 2 1.'7
Short Grass Pasture KvV 7 L=100' 0=.02 'f' V�.99 fps
S19ALLOW CONCENTRATED/UPIeAIM FLOW 3 5.6
Grassed waterway Kvm15 L=500' 6=.01 '/' V=1.5 fps
Total Length= 700 ft Tatar. Tc= 15.8
B i�T H E lT I RUNOFF
Post Development Drainoge Areo
1 �
AREA= 2 .69 AC
Tc= 15.8 MIN
C N= 90
SCS TR-20 METHGO
g TYPE III 24-HOER
r-` RAINFALL-= 6. 5 IN
7
PEAK= I t .5 CE5
6 e 12 . 1 7 HR5
OLUME= 1 .04 AE
_71 5
4
3
2
— ry 19 v in to r- m rn m
TIME Chours
DRAINAGE CALCULATIONS
A-
MIN all in MEMO 01 ,
AMMIMM worm IMSIMSIMEM
Immom
-HMO URN MITI "AMM- ERmcm �IMN�T OMENS �1=01=
wm�ww MT . mmom m
�■mm �mm
� iNONE Emmmm
m MINIM
DRAINAGE AREA
SITE PLANS
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