HomeMy WebLinkAboutMiscellaneous - 49 ORCHARD HILL ROAD 2/13/1998 CHRISTIANSEN & SERGI, INC.
PROFESSIONAL ENGINEERS AND LAND SURVEYORS
160 SUMMER STREET HAVER14ILL.,MASSACHLJSETTS01830-6318 (978)373-0310 FAX: (978)372-3960
HYDROLOGIC ANALYSIS
FOR
LOT 1-2B-1 ORCHARD HILL ROAD
IN
NORTH ANDOVER, MASS.
PREPARED FOR
BAY HILL L.L.C.
DATE: FEBRUARY 13,, 1998
LOT 1-2B-1 ORCHARD HILL ROAD
HYDROLOGIC ANALYSIS
A hydrologic analysis has been performed to determine the impact that the
development on the lot has on off-site peak runoff rates. The "HydroCAD" Stormwater
Modeling System has been used to compare the pre- and post-development runoff rates
and to design the infiltration and detention facilities. The stormwater management system
as designed will keep post-development peak rates equal to or less than the pre-
development peak rates for the 2, 10, and 100 year storm events.
Under existing(pre-development) conditions, the 3.7 acre project site lies at the
bottom of an 8.9 acre contributing watershed. This watershed is shown as Drainage Area
1 on the enclosed "EXISTING DRAINAGE AREA MAP". The U.S.G.S. topographic
Contours and the Soil Conservation Service Soil types around the project area are also
shown on this plan.
Under the proposed post-development conditions, the contributing watershed has
been divided into 6 drainage areas for the purpose of the analysis. These drainage areas
are shown on the enclosed "POST-DEVELOPMENT DRAINAGE AREA MAP", and
may be summarized as follows:
Drainage Area 2 consists of 5.2 acres of woodlands that lies upgradient of the
project site. Any runoff from this area will flow onto Drainage Area 3 on the project site.
Drainage Area 3 consists of 2.4 acres of the project site that will drain into the
proposed drainage system that contributes the flow to Detention/Infiltration Area 1. This
area includes most of the proposed pavement areas on the site.
Drainage Area 4 is the 0.5 acre portion of the site that lies along the unimproved
section of Orchard Hill Road. Runoff from this area, which will consist of lawn, planting
areas, and undisturbed woodlands,will drain off of the project site uncontrolled.
Drainage Area 5 lies in the northwest corner of the site between the paved cul-de-
sac and the abutting lot to the west. Runoff from this 0.1 acre area will drain off of the
project site uncontrolled.
Drainage Area 6 consists of the roof area of the 21,600 square foot building.
Runoff from the roof will be directed to Infiltration Area 2, which is a proposed 2400
square foot leaching facility to be located under the parking area to the west of the
building.
Drainage Area 7 is a 0.2 acre portion of the site that includes the portions of the
proposed driveway and parking area that could not drain into Detention/infiltration Area 1
due to the topographical constraints. Runoff from this area will be collected by two catch
basins located at the beginning of the driveway and directed into Infiltration Area 3, which
is a proposed 1000 square foot leaching facility to be located under a lawn area to the
west of the proposed driveway.
It should be noted that the existing conditions in the watershed (well drained soils
within a wooded area) result in very low runoff rates from the less intense storm events.
For this reason, little or no surface runoff could be allowed to flow off the site during the
2 year and 10 year storm events. Infiltration Areas 2 and 3 were designed to recharge
100% of the runoff from Drainage Areas 6 and 7 in the all of the design storms.
Detention/Infiltration Area 1 was designed to recharge 100% of the runoff from the two
year design storm,but will allow some of the higher flows generated by the 10 and 100
year design storms to flow through the proposed outlet structure and be directed off site.
The results of the hydrologic analysis are summarized as follows:
TABLE t• PEAK OFFSITE FLOW RATES
DESIGN STORM EXISTING POST-DEVELOPMENT
CONDITIONS CONDITIONS
_2 YEAR 0.0 C.F.S. 0.1 C.F.S.
10 YEAR 0.6 C.F.S. 0.6 C.F.S.
100 YEAR 5.7 C.F.S. 3.8 C.F.S.
I
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 1
TYPE II 24-HOUR RAINFALL= 6.4 IN 13 Feb 98
Prepared by CHRISTIANSEN & SERGI, INC.
H droCAD 4.52 001057 c 1986-1996 A lied Microcomputer S stems
WATERSHED ROUTING
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D2 (D 50 (D 70
t01 102 tea
Std MM tq i IG
Ilb o tit IJ
( )SUBCATCHNENT F] REACH Q POND LINK
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 3
TYPE II 24-HOUR RAINFALL= 3.1 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H droCAD 4.52 001057 c 1986-1996 Applied Microcom uter S stems
SUBCATCHMENT 1 DRAINAGE AREA 1: EXISTING CONDITIONS
PEAK= .02 CFS @ 18.75 HRS, VOLUME= .01 AF
ACRES CN SCS TR-20 METHOD
4.25 30 H.S. GROUP A: WOODS, GOOD COND. TYPE II 24-HOUR
4 .34 55 H.S. GROUP B: WOODS, GOOD COND. RAINFALL= 3.1 IN
.34 70 H.S. GROUP C: WOODS, GOOD COND. SPAN= 10-20 HRS, dt=.1 HRS
8 .93 44
Comment Tr lminl
Method 6.1
TR-55 SHEET FLOW
Woods: Light underbrush n=.4 L=50' P2=3.1 in s=.12 14.6
SHALLOW CONCENTRATED/UPLAND FLOW
Woodland KV=5 L=980' s=.05 '/' V=1.12 fps
Total Length= 1030 ft Total Tc= 20.7
SUBCATCHMENT 1 RUNOFF
DRAINAGE AREA 1 : EXISTING CONDITIONS
.022 A= 8.93 AC
Tc= 20.7 MIN
,020 CN= 44
.018
r. .016 SCS TR-20 METHOD
LO TYPE II 24-HOUR
4- .014 RAINFALL= 3. 1 IN
.012 PEAK= .02 CFS
3 ,010 e 16,75 HRS
0 008 UOLUME= .01 AF
.006
.004
.002
0.000m N M v in r oo m m
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 4
TYPE II 24-HOUR RAINFALL= 3 .1 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H droCAD 4.52 001057 c ..1986-1996 A lied Microcom uter S stems
SUBCATCHMENT 2 DRAINAGE AREA 2: PROPOSED CONDITIONS
PEAK= .01 CFS @ 18 .67 HRS, VOLUME= .01 AF
ACRES CN SCS TR-20 METHOD
2.56 30 H.S. GROUP A: WOODS, GOOD COND. TYPE II 24-HOUR
2.34 55 H.S. GROUP B: WOODS, GOOD COND. RAINFALL= 3.1 IN
.32 70 H.S. GROUP C: WOODS, GOOD COND. SPAN= 10-20 HRS, dt=.1 HRS
5.22 44
Method Comment Tc (min)
6.1
TR-55 SHEET FLOW
Woods: Light underbrush n=.4 L=50' P2=3.1 in s=.12 '/' 8.6
SHALLOW CONCENTRATED/UPLAND FLOW
Woodland KV=5 L=580' s=.05 '/' V=1.12 fps
Total Length= 630 ft Total Tc= 14.7
SUBCATCHMENT 2 RUNOFF
DRAINAGE AREA 2 : PROPOSED CONDITIONS
.013 A= 5.22 AC
.012 Tc= 14.7 MIN
.011 CN= 44
.010 SCS TR-20 METHOD
j ,009 TYPE II 24-HOUR
4- .008 RAINFALL= 3. 1 IN
L)
007
PEAK= .01 CFS
3 .006 e 16.67 HRS
O .005 UOLUME= .01 AF
004
003
.002
.001
0.000
m � N f*7 �t t!) i0 I� 01) Ol m
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 5
TYPE II 24-HOUR RAINFALL= 3 .1 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H droCAD 4.52 001057 c 1986,-1996 A lied Microcom uter Systems
SUBCATCHMENT 3 DRAINAGE AREA 3: PROPOSED CONDITIONS
PEAK= 2.39 CFS @ 11.94 HRS, VOLUME= .13 AF
ACRES CN SCS TR-20 METHOD
.42 98 H.S. GROUP A: IMPERVIOUS TYPE II 24-HOUR
.55 98 H.S. GROUP B: IMPERVIOUS RAINFALL= 3 .1 IN
.48 39 H.S. GROUP A: LAWN SPAN= 10-20 HRS, dt=.1 HRS
.45 61 H.S. GROUP B: LAWN
.16 30 H.S. GROUP A: WOODS, GOOD COND.
.36 55 H.S. GROUP B: WOODS, GOOD COND.
2.42 69
Comment Tc (min)
Method 5.6
TR-55 SHEET FLOW
Woods: Light underbrush n=.4 L=50' P2=3 .1 in s=.15 1
SHALLOW CONCENTRATED/UPLAND FLOW
Unpaved Kv=16.1345 L=30' s=.3 ' /' V=8 .84 fps
1.4
SHALLOW CONCENTRATED/UPLAND FLOW
Paved Kv=20.3282 L=240' s=.02 '/' V=2 .87 fps
Total Length= 320 ft Total Tc= 7.1
SUBCATCHMENT 3 RUNOFF
DRAINAGE AREA 3 . PROPOSED CONDITIONS
2.4
2.2 AREA= 2.42 AC
Tc= 7. 1 MIN
2.0 CN= 69
1 .8 SCS TR-20 METHOD
1 .6 TYPE II 24-HOUR
to
(+ 1 .4 RAINFALL= 3. 1 IN
L)
" 1 .2 PEAK= 2.39 CFS
3 1 .0 e 11 .94 HRS
0 8 UOLUME= . 13 AF
J
6
.4
.2
N
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 6
TYPE II 24-HOUR RAINFALL= 3 .1 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H droCAD 4.52 001057 c 1986-1 96 A li d Microcom1puter Systems
SUBCATCHmENT 4 DRAINAGE AREA 4: PROPOSED CONDITIONS
PEAK= .10 CFS @ 11.92 HRS, VOLUME= .01 AF
ACRES CN SCS TR-20 METHOD
.08 39 H.S. GROUP A: LAWN TYPE II 24-HOUR
.22 61 H.S. GROUP B: LAWN RAINFALL= 3.1 IN
.17 55 H.S. GROUP B: WOODS, GOOD COND. SPAN= 10-20 HRS, dt=.l HRS
.02 74 H.S. GROUP C: LAWN
.49 56
Method Comment Tc (min)
2.1
TR-55 SHEET FLOW
Grass: Short n=.15 L=40' P2=3.1 in s=.15 '/' 9
SHALLOW CONCENTRATED/UPLAND FLOW
Woodland KV=5 L=67' s=.06 '/' V=1.22 .fps
Total Length= 107 ft Total Tc= 3.0
SUBCATCHMENT 4 RUNOFF
DRAINAGE AREA 41 PROPOSED CONDITIONS
.095 AREA= .49 AC
.090 Tc= 3 MIN
080 CN= 56
.075
.070 SCS TR-20 METHOD
.065 TYPE II 24-HOUR
to
.055 RAINFALL= 3. 1 IN
.050 PEAK= . 10 CFS
3 ,040 e 11 .92 HRS
0 .035 VOLUME= .01 AF
—J .030
LL .025
.020
.015
,010
.005
O.OeO
m N m OD N
TIME (hours) _
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 7
TYPE II 24-HOUR RAINFALL= 3.1 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H droCAD 4.52 001057 c 1986-1 96 A li d Mi rocom uter Systems
SUBCATCHMENT 5 DRAINAGE AREA 5: PROPOSED CONDITIONS
PEAK= 0.00 CFS @ 0.00 HRS, VOLUME= 0.00 AF
ACRES CN SCS TR-20 METHOD
.09 39 H.S. GROUP A: LAWN TYPE II 24-HOUR
RAINFALL= 3.1 IN
SPAN= 10-20 HRS, dt=.1 HRS
Method Comment Tr (min)
1.9
TR-55 SHEET FLOW
Grass: Short n=.15 L=20' P2=3.1 in s=.05 ' /' 5
SHALLOW CONCENTRATED/UPLAND FLOW
Unpaved Kv=16.1345 L=100' s=.05 '/' V=3.61 fps
Total Length= 120 ft Total Tc= 2.4
SUBCATCHMENT 5 RUNOFF
DRAINAGE AREA 5 ; PROPOSED CONDITIONS
t0
AREA= .09 AC
9 Tc= 2.4 MIN
8 CN= 39
7 SCS TR-20 METHOD
TYPE II 24-HOUR
4- 6 RAINFALL= 3. 1 IN
U
5 PEAK= 0.00 CF5
4 E 0 HRS
CD 1 UOLUME= 0.00 AF
3
2
1
Om N m v in r m T m
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 8
TYPE II 24-HOUR RAINFALL= 3.1 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
HVdroCAD 4.52 001057 (c) 1986-1996 Applied Microcomputer Systems
SUBCATCHMENT 6 DRAINAGE AREA 6: PROPOSED CONDITIONS
PEAK= 2.00 CFS @ 11.84 HRS, VOLUME= .10 AF
ACRES CN SCS TR-20 METHOD
.22 98 H.S. GROUP A: IMPERVIOUS TYPE II 24-HOUR
.28 98 H.S. GROUP B: IMPERVIOUS RAINFALL= 3.1 IN
.50 98 SPAN= 10-20 HRS, dt=.1 HRS
Method Comment T min
.4
TR-55 SHEET FLOW
Smooth surfaces n=.011 L=60' P2=3.1 in s=.15 ' /'
.8
CIRCULAR CHANNEL
12" Diameter a=.79 sq-ft Pw=3.1' r=.25'
s=.005 '/' n=.009 V=4.63 fps L=220' Capacity=3 .6 cfs
Total Length= 280 ft Total Tc= 1.2
SUBCATCHMENT 6 RUNOFF
DRAINAGE AREA 6 , PROPOSED CONDITIONS
2.0
1 .9 AREA- .5 AC
1 .8 Tc= 1 .2 MIN
1 .7
1 .6 CN= 96
1 .5
1 .4 SCS TR-20 METHOD
j 1 .3 TYPE II 24-HOUR
`+ 1 .2 RAINFALL= 3. 1 IN
L) 1 . 1
1 .0 PEAK= 2.00 CFS
3 .8 L 11 .84 HRS
0 .7 UDLUME= . 10 AF
J 6
LL 5
.4
.3
.2
. 1
in r m rn m
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 9
TYPE II 24-HOUR RAINFALL= 3.1 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
HydroCAD 4 52 001057 (c) 1986-1996 Applied Microcomputer Svs ems
SUBCATCHMENT 7 DRAINAGE AREA 7: PROPOSED CONDITIONS
PEAK= .38 CFS @ 11.87 HRS, VOLUME= .02 AF
ACRES CN SCS TR-20 METHOD
.14 98 H.S. GROUP A: IMPERVIOUS TYPE II 24-HOUR
.10 39 H.S. GROUP A: LAWN RAINFALL= 3 .1 IN
.24 73 SPAN= 10-20 HRS, dt=.1 HRS
Method Comment Tr (min)
.8
TR-55 SHEET FLOW
Grass: Short n=.15 L=15' P2=3.1 in s=.25 '/'
SHALLOW CONCENTRATED/UPLAND FLOW 5
Paved Kv=20.3282 L=150' s=.06 '/' V=4.98 fps
Total Length= 165 ft Total Tc= 1.3
SUBCATCHMENT 7 RUNOFF
DRAINAGE AREA 7 ; PROPOSED CONDITIONS
.38
.36 AREA= .24 AC
.34 Tc= 1 .3 MIN
•32 CN= 73
.30
.28
.26 SCS TR-20 METHOD
.24 TYPE II 24-HOUR
4- .22 RAINFALL= 3. 1 IN
.20
, 18 PEAK= .38 CFS
3 . 16 e 11 .87 HRS
o . 14 UOLUME= .02 AF
-i . 12
LL . 10
.08
.06
.04
.02
0.00m T N m ,r- in w r a> rn N
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 10
TYPE II 24-HOUR RAINFALL= 3 .1 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H droCAD 4.52 001057 1 6-1 96 A lied Microcom uter tems
POND 101 DETENTION/INFILTRATION AREA 1
Qin = 2.39 CFS @ 11.94 HRS, VOLUME= .14 AF
Qout= .05 CPS @ 20.00 HRS, VOLUME= .03 AF, ATTEN= 98%, LAG= 483 .3 MIN
Qpri= .05 CFS @ 20.00 HRS, VOLUME= .03 AF
Qsec= 0.00 CFS @ 0.00 HRS, VOLUME= 0.00 AF
ELEVATION AREA INC.STOR CUM.STOR STOR-IND METHOD
(FTl (SF) (CF) (CF) PEAK STORAGE = 4472 CF
102 .0 1500 0 0 PEAK ELEVATION= 103.6 FT
103 .0 2950 2225 2225 FLOOD ELEVATION= 106.0 FT
104.0 4400 3675 5900 START ELEVATION= 102.0 FT
105.0 5250 4825 10725 SPAN= 10-20 HRS, dt=.1 HRS
106 .0 6100 5675 16400 Tdet= 261.5 MIN ( .03 AF)
ROUTE INVERT OUTLET DEVICES
1 P 102.0' ENFILTRATION
V= .001389 FPM over (SURFACE AREA - 1500 SF)
2 S 103.7' 4" ORIFICE/GRATE
Q=.6 PI r-2 SQR(2g) SQR(H-r)
3 S 104.5' 12° ORIFICE/GRATE
Q=.6 PI r^2 SQR(2g) SQR(H-r)
Primary Discharge
1--1=Exfiltration
Secondary Discharge
--2=Orif ice/Grate
I 3=0rifice/Grate
POND 101 INFLOW & OUTFLOW
DETENTION/INFILTRATION AREA 1
2.,4
2.2 STOR-IND METHOD
PEAK STOR= 4472 CF
2.0 PEAK ELEU= 103.6 FT
1 .8 Gin= 2.39 CFS
1 .6 Qout= .05 CFS
c} 1 Qpri= .05 CF5
l7 Qsec= 0.00 CFS
1 .2
LAG= 483.3 MIN
3 1 .0
O 8
J
6
4
.2
0, N -- ---------------
--�--�--�--- 0)0 m - m
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 11
TYPE II 24-HOUR RAINFALL= 3.1 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H droCAD 4.52 0010 7 c 19 6-1996 Applied Microcom u er S stems
POND 102 INFILTATION AREA 2
Qin = 2 .00 CFS @ 11.84 HRS, VOLUME= .10 AF
Qout= .03 CFS @ 16 .48 HRS, VOLUME= .02 AF, ATTEN= 980, LAG= 278.3 MIN
ELEVATION CON.AREA INC.STOR CUM.STOR WET.AREA STOR-IND METHOD
(FT) (SF) (CF) (CF) (SF) PEAK STORAGE = 3362 CF
106.0 2400 0 0 2400 PEAK ELEVATION= 107.4 FT
110.0 2401 9602 9602 3095 START ELEVATION= 106.0 FT
SPAN= 10-20 HRS, dt=.1 HRS
Tdet= 281.2 MIN ( .02 AF)
ROUTE INVERT OUTLET DEVICES
1 P 106.0' EXFILTRATION
V= .008333 FPM over (WETTED AREA - 2400 SF)
POND 102 INFLOW & OUTFLOW
INFILTATION AREA 2
2.0
1 .9 STOR-IND METHOD
1 .8 PEAK 5TOR= 3362 CF
1 .7 PEAK ELEU= 107.4 FT
1 .6
1 .5
1 .4 Din= 2.00 CFS
j 1 .3 Dout= .03 CFS
�+ 1 .2 LAG= 278.3 MIN
U 1 . 1
C 1 ,7
.9
3 .B
O .7
6
L� 5
,4
3
.2
. 1
0.0m _ ��-- --b -- to �o r m rn m
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 12
TYPE II 24-HOUR RAINFALL= 3.1 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
HydroCAD 4.52 001057 (c) 1986-1996 Applied Microcomputer Svstems
POND 103 INFILTRATION AREA 3
Qin = .38 CFS @ 11.87 HRS, VOLUME= .02 AF
Qout= .01 CFS @ 18.06 HRS, VOLUME= .01 AF, ATTEN= 980, LAG= 371.4 MIN
ELEVATION CON.AREA INC.STOR CUM.STOR WET.AREA STOR-IND METHOD
(FT) (SF) (CF) (CF) (SF) PEAK STORAGE = 510 CF
105.0 1000 0 0 1000 PEAK ELEVATION= 105.5 FT
108.0 1001 3001 3001 1336 FLOOD ELEVATION= 108.0 FT
START ELEVATION= 105.0 FT
SPAN= 10-20 HRS, dt=.1 HRS
Tdet= 259.5 MIN (0 AF)
ROUTE INVERT OUTLET DEVICES
1 P 105.0' EXFILTRATION
V= .008333 FPM over (WETTED AREA - 1000 SF)
POND 103 INFLOW & OUTFLOW
INFILTRATION AREA 3
.38
•36 STOR-IND METHOD
.34 PEAK STOR= 510 CF
'32 PEAK ELEU= 105.5 FT
.30
.26 Qin= .38 CFS
24 Dout= .01 CFS
�+ .22 LAG= 371 .4 MIN
20
. 18
3 . 16
o . 12
' 10 -
.08 -
.06
.04
.02
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 13
TYPE II 24-HOUR RAINFALL= 3.1 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
HydroCAD 4 52 001057 (c) 1986-1996 Applied Microcomputer Systems
POND 104 sv MM ll T10\y 0��
Not described
Qin = .10 CFS @ 11.92 HRS, VOLUME= .01 AF
Qout= .10 CFS @ 11.92 HRS, VOLUME= .01 AF, ATTEN= 0%-, LAG= 0.0 MIN
ELEVATION AREA INC.STOR CUM.STOR - METHOD
(FT) (AC) (AF) (AF) PEAK STORAGE = 0.00 AF
PEAK ELEVATION= 0.0 FT
FLOOD ELEVATION= 0.0 FT
START ELEVATION= 0.0 FT
SPAN= 10-20 HRS, dt=.1 HRS
ROUTE INVERT OUTLET DEVICES
POND 104 INFLOW & OUTFLOW
Not described
.095 - METHOD
,090
.085 PEAK STDR= 0.00 AF
088 PEAK ELEU= 0 FT
.075
,070 Qin= . 10 CFS
.065 Qout= . 10 CFS
.055 LAG= 0 MIN
050
3 .040
cl .035
' .030
.025
.020
.015
,010
.005
O.Oee
m N m v m o' N
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 14
TYPE II 24-HOUR RAINFALL= 4.5 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H droCAD 4.52 001057 1 86-lqqA Applied Microcom uter Systems
SUBCATCHMENT 1 DRAINAGE AREA 1: EXISTING CONDITIONS
PEAK= .60 CFS @ 12.27 HRS, VOLUME= .15 AF
ACRES CN SCS TR-20 METHOD
4 .25 30 H.S. GROUP A: WOODS, GOOD COND. TYPE II 24-HOUR
4 .34 55 H.S. GROUP B: WOODS, GOOD COND. RAINFALL= 4.5 IN
.34 70 H.S. GROUP C: WOODS, GOOD COND. SPAN= 10-20 HRS, dt=.1 HRS
8 .93 44
Method Comment Tr (min)
6.1
TR-55 SHEET FLOW
Woods: Light underbrush n=.4 L=50' P2=3.1 in s=.12 14.6
SHALLOW CONCENTRATED/UPLAND FLOW
Woodland KV=5 L=980' s=.05 '/' V=1.12 fps
Total Length= 1030 ft Total Tc- 20.7
SUBCATCHMENT 1 RUNOFF
DRAINAGE AREA 1 : EXISTING CONDITIONS
.60
.55 AREA= 8.93 AC
To= 20.7 MIN
.50 CN= 44
.45
40 SCS TR-20 METHOD
TYPE II 24-HOUR
<+ 35 RAINFALL= 4.5 IN
L)
30
PEAK= .60 CFS
3 .25 e 12.27 HR5
0 20 UDLUME= . 15 OF
Li- 15
. 10
.05
0.00m T N r*, U) 'D r Co rn m
TIME (hour5)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 15
TYPE II 24-HOUR RAINFALL= 4.5 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
H droCAD 4 .52 001057 c 1986-1.996 Applied Microcom uter Systems
SDBCATCHMENT 2 DRAINAGE AREA 2: PROPOSED CONDITIONS
PEAK= .42 CFS @ 12.14 HRS, VOLUME= .09 AF
ACRES CN SCS TR-20 METHOD
2.56 30 H.S. GROUP A: WOODS, GOOD COND. TYPE II 24-HOUR
2.34 55 H.S. GROUP B: WOODS, GOOD COND. RAINFALL= 4.5 IN
.32 70 H.S. GROUP C: WOODS, GOOD COND. SPAN= 10-20 HRS, dt=.1 HRS
5.22 44
Method Comment Tc (min)
6.1
TR-55 SHEET FLOW
Woods: Light underbrush n=.4 L=50' P2=3 .1 in s=.12 '/'
8.6
SHALLOW CONCENTRATED/UPLAND FLOW
Woodland KV=5 L=580' s=.05 '/' V=1.12 fps
Total Length= 630 ft Total Tc= 14.7
SUBCATCHMENT 2 RUNOFF
DRAINAGE AREA 2 ; PROPOSED CONDITIONS
.40 AREA= 5.22 AC
35 Tc= 14.7 MIN
CN= 44
30 SCS TR-20 METHOD
`l TYPE II 24-HOUR
c, 25 RAINFALL= 4.5 IN
U
v •20 PEAK= .42 CFS
3 e 12. 14 HRS
o . 15 UDLUME= .09 AF
J
� . 10
.05
0.0 m v to r OD rn m
TIME (hour5)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 16
TYPE II 24-HOUR RAINFALL= 4.5 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
HVdroCAD 4 52 001057 (c) 1986-1996 Applied Microcomputer Systems
SIIBCATCHMENT 3 DRAINAGE AREA 3: PROPOSED CONDITIONS
PEAK= 5.77 CFS Q 11.93 HRS, VOLUME= .29 AF
ACRES CN SCS TR-20 METHOD
.42 98 H.S. GROUP A: IMPERVIOUS TYPE II 24-HOUR
.55 98 H.S. GROUP B: IMPERVIOUS RAINFALL= 4.5 IN
.48 39 H.S. GROUP A: LAWN SPAN= 10-20 HRS, dt=.1 HRS
.45 61 H.S. GROUP B: LAWN
.16 30 H.S. GROUP A: WOODS, GOOD COND.
.36 55 H.S. GROUP B: WOODS, GOOD COND.
2.42 69
Method Comment Tr- (min)
TR-55 SHEET FLOW 5.6
Woods: Light underbrush n=.4 L=50' P2=3 .1 in s=.15
SHALLOW CONCENTRATED/UPLAND FLOW .1
Unpaved Kv=16 .1345 L=30' s=.3 '/' V=8 .84 fps
SHALLOW CONCENTRATED/UPLAND FLOW 1.4
Paved Kv=20.3282 L=240' s=.02 '/' V=2.87 fps
Total Length= 320 ft Total Tc= 7.1
SUBCATCHMENT 3 RUNOFF
DRAINAGE AREA 3 . PROPOSED CONDITIONS
5.5 AREA-- 2.42 AC
5,0 Tc= 7. 1 MIN
4.5 CN= 69
4.0 SCS TR-20 METHOD
o 3.5 TYPE II 24-HOUR
RAINFALL= 4.5 IN
v 3.0
3
2.5 - PEAK= 5.77 CFS
e 11 ,93 HRS
0 2.0 VOLUME= .29 AF
LL 1 ,5 -
1 .0
.5
0,0m N m d Ln r ® rn m
TIME (hours)
Data for LOT 1-2B ORCHARD BILL ROAD, NORTH ANDOVER Page 17
TYPE II 24-HOUR RAINFALL= 4.5 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
H droCAD 4.52 001057 c 1 86-1 6 A lied Microcom uter S stems
SUBCATCmMNT 4 DRAINAGE AREA 4: PROPOSED CONDITIONS
PEAK= .63 CFS @ 11.90 HRS, VOLUME= .03 AF
ACRES CN SCS TR-20 METHOD
.08 39 H.S. GROUP A: LAWN TYPE II 24-HOUR
.22 61 H.S. GROUP B: LAWN RAINFALL= 4.5 IN
.17 55 H.S. GROUP B: WOODS, GOOD COND. SPAN= 10-20 HRS, dt=.1 HRS
02 74 H.S. GROUP C: LAWN
.49 56
Method Comment Tc (min)
2.1
TR-55 SHEET FLOW
Grass: Short n=.15 L=40' P2=3 .1 in s=.15 '/' 9
SHALLOW CONCENTRATED/UPLAND FLOW
Woodland KV=5 L=67' s=.06 '/' V=1.Z2 fps
Total Length= 107 ft Total Tc= 3.0
SUBCATCHMENT 4 RUNOFF
DRAINAGE AREA 4 : PROPOSED CONDITIONS
.6e AREA-- .49 AC
.55 Tc= 3 MIN
.58 CN= 56
•45 SCS TR-20 METHOD
.40 TYPE II 24-HDUR
- 35 RAINFALL= 4.5 IN
.30 PEAK= .63 CFS
3 ,25 C 11 .9 HR5
OJ 20 UDLUME= .03 AF
LL 15
. 10
,05
0,00m N m � T r m rn m
TIME (hours) -
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 18
TYPE II 24-HOUR RAINFALL= 4.5 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
HydroCAD 4 52 001057 (c) 1986-1996 Applied Microcomputer Systems
SUBCATCHMENT 5 DRAINAGE AREA 5: PROPOSED CONDITIONS
PEAK= 0.00 CFS @ 13.30 HRS, VOLUME= 0.00 AF
ACRES CN SCS TR-20 METHOD
.09 39 H.S. GROUP A: LAWN TYPE II 24-HOUR
RAINFALL= 4.5 IN
SPAN= 10-20 HRS, dt=.1 HRS
Method Comment Tc (min)
TR-55 SHEET FLOW 1.9
Grass: Short n=.15 L=20' P2=3.1 in s=.05
SHALLOW CONCENTRATED/UPLAND FLOW .5
Unpaved Kv=16.1345 L=100' s=.05 '/' V=3.61 fps
Total_Length= 120 ft Total Tc= 2.4
SUBCATCHMENT 5 RUNOFF
DRAINAGE AREA 5 : PROPOSED CONDITIONS
.0011
0010 AREA= .09 AC
Tc= 2.4 MIN
0009 = 39
.0008 SCS TR-20 ME D
.0007 TYPE II 24-HOU
`+ RAINFALL= 4.5 IN
L) .0006
v
0005 PEAK= 0.00 CFS
0 0004 G 13.3 HRS
J UOLUME= 0.00 AF
L .0003
.0002
.0001
0.0000
m N frJ V ln 01 N
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 19
TYPE II 24-HOUR RAINFALL= 4.5 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
H droCAD 4.52 001057 c 1986-1996 A lied Microcom uter Systems
SUBCATCHMENT 6 DRAINAGE AREA 6: PROPOSED CONDITIONS
PEAK= 2.92 CFS @ 11.84 HRS, VOLUME= .14 AF
ACRES CN SCS TR-20 METHOD
.22 98 H.S. GROUP A: IMPERVIOUS TYPE II 24-HOUR
28 98 H.S. GROUP B: IMPERVIOUS RAINFALL= 4.5 IN
.50 98 SPAN= 10-20 HRS, dt=.1 HRS
Method Comment Tr- (min)
.4
TR-55 SHEET FLOW
Smooth surfaces n=.011 L=60' P2=3.1 in s=.15 '/' 8
CIRCULAR CHANNEL
1211 Diameter a=.79 sq-ft Pw=3.1' r=.25'
S=.005 '/' n=.009 V=4.63 fps L=220' Capacity=3 .6 cfs
Total Length= 280 ft Total Tc= 1.2
SUBCATCHMENT 6 RUNOFF
DRAINAGE AREA 6 : PROPOSED CONDITIONS
2.8 AREA= .5 AC
2.6 Tc= 1 .2 MIN
2.4 CN= 98
2.2
r. 2.0 SCS TR-20 METHOD
TYPE II 24-HOUR
i '8 RAINFALL= X1.5 IN
L) 1 .6
1 .4 PEAK= 2.92 CFS
3 1 .2 G 11 .84 HRS
001 1 .0 UDLUME= . 14 AF
LL '8
.6
.4
.2
0.0m N M v 'n r ao rn N
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 20
TYPE II 24-HOUR RAINFALL= 4.5 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
H droCAD 4.52 001057 c 1986-19 6 A lied microcomputer S terns
SUBCATCHMENT 7 DRAINAGE AREA 7: PROPOSED CONDITIONS
PEAK= .78 CFS @ 11.87 HRS, VOLUME= .03 AF
ACRES CN SCS TR-20 METHOD
.14 98 H.S. GROUP A: IMPERVIOUS TYPE II 24-HOUR
10 39 H.S. GROUP A: LAWN RAINFALL= 4.5 IN
.24 73 SPAN= 10-20 HRS, dt=.l HRS
Method Comment Tr- (min)
.8
TR-55 SHEET FLOW
Grass: Short n=.15 L=15' P2=3.1 in s=.25 '/' 5
SHALLOW CONCENTRATED/UPLAND FLOW
Paved Kv=20.3282 L=150' s=.06 '/' V=4.98 fps
Total Length= 165 ft Total Tc= 1.3
SUBCATCHMENT 7 RUNOFF
DRAINAGE AREA 7 ; PROPOSED CONDITIONS
.75 AREA= .24 AC
.70 Tc= 1 .3 MIN
.65 CN= 73
.60
.55 SCS TR-20 METHOD
,50 TYPE II 24-HOUR
4- ,45 RAINFALL= 4.5 IN
40 PEAK= .78 CFS
p 30 e 11 ,87 HR5
J 25 UDLUME= .03 AF
L- .20
. 15
. 10
.05
0,000 N m 't to co rn N
TIME (hour5)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 21
TYPE II 24-HOUR RAINFALL= 4.5 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H droCAD 4.52 001057 c 1986-1 6 A lied Microcom uter S s em
POND 101 6 DETENTION/INFILTRATION AREA 1 AF
Qin = 5.82 CFS @ 11.93 HRS, VOLUME= .24 AF, ATTEN= 930, LAG= 120.1 MIN
Qout= .42 CFS @ 13.94 HRS, VOLUME=
Qpri= .08 CFS @ 13.94 HRS, VOLUME= .05 AF
Qsec= .34 CFS @ 13.94 HRS, VOLUME= .19 AF
STOR-IND METHOD
ELEVATION AREA INC.STOR CUM.STOR PEAK STORAGE = 8366 CF
(FT) SF� «'F1 (C 0 PEAK ELEVATION= 104.5 FT
102.0 1500 0
2225 2225 FLOOD ELEVATION= 106 .0 FT
103.0 2950 START ELEVATION= 102.0 FT
104.0 4400 3675 5900
4825 10725 SPAN= 10-20 HRS, dt=.1 HRS
5250
105.0 Tdet= 217.1 MIN ( .24 AF)
106.0 6100 5675 16400
ROUTE INVERT OUTLET DEVICES
1 P 102 .0' EXFILTRATION
V= .001389 FPM over (SURFACE AREA - 1500 SF)
2 S 103 .7' 4" ORIFICE/GRATE
Q=.6 PI r-2 SQR(2g) SQR(H-r)
3 S 104 .5' Q=.6pPIgr^2 SQRT2g) SQR(H-r)
Primary Discharge
I 1=Exf i ltrat ion
Secondary Discharge
�--2=Orifice/Grate
�--3=Orifice/Grate
PON OUTFLOW
DETENTION/INFILTRATION AREA 1
5.5 STOR-IND METHOD
5.0 PEAK STOR= 6366 CF
PEAK ELEU= 104.5 FT
4,5
4.0 Din= 5.82 CFS
Qout= .42 CFS
y� 3,5 Qpri= .08 CFS
u 3,0 Qsec= .34 CF5
LAG= 120. 1 MIN
3 2.5
OJ 2.0
1 .0
0,em T N In - m N
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 22
TYPE II 24-HOUR RAINFALL= 4.5 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H droCAD 4.52 001057 c 1986-1996 A lied microcomputer Systems
POND 102 INFILTATION AREA 2
Qin = 2.92 CFS @ 11.84 HRS, VOLUME= .14 AF
Qout= .05 CFS @ 16.42 HRS, VOLUME= .03 AF, ATTEN= 98e, LAG= 274.7 MIN
ELEVATION CON.AREA INC.STOR CUM.STOR WET.AREA PEAK STOR-IND METHOD 4927 CF
(FT) (SF) (CF) (CF) SF
106.0 2400 0 0 2400 PEAK ELEVATION= 108.1 FT
110.0 2401 9602 9602 3095 START ELEVATION= 106.0 FT
SPAN= 10-20 HRS, dt=.1 HRS
Tdet= 281.5 MIN ( .03 AF)
ROUTE INVERT OUTLET DEVICES
1 P 106.0' EXFILTRATION
V= .008333 FPM over (WETTED AREA - 2400 SF)
POND 102 INFLOW & OUTFLOW
INFILTATION AREA 2
2,8 STOR-IND METHOD
2.6 PEAK STOR= 4927 CF
2.4 PEAK ELEU= 108. 1 FT
2.2 Din= 2.92 CFS
2.0 Qcut= .05 CFS
LAG= 274.7 MIN
L) 1 .6
" 1 ,4
3 1 .2
0 1 .0
Li- '8
.6
4
.2
0 lam N-- rn -- -- tD r m m
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 23
TYPE II 24-HOUR RAINFALL= 4.5 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
H droCAD 4.52 001057 c 1986-1996 An
lied Microcom uter S stems
POND 103 INFILTRATION AREA 3
Qin = .78 CFS @ 11.87 HRS, VOLUME= .03 AF
Qout= .02 CFS @ 16.64 HRS, VOLUME= .01 AF, ATTEN= 980, LAG= 286.3 MIN
ELEVATION CON AREA INC.STOR CUM.STOR WET.AREA STOR-IND METHOD
(FT) (SF) (CF) (CF) (SF) PEAK STORAGE = 1074 CF
105.0 1000 0 0 1000 PEAK ELEVATION= 106.1 FT
108 .0 1001 3001 3001 1336 FLOOD ELEVATION= 108 .0 FT
START ELEVATION= 105.0 FT
SPAN= 10-20 HRS, dt=.1 HRS
Tdet= 262.1 MIN ( .01 AF)
ROUTE INVERT OUTLET DEVICES
1 P 105.0' EXFILTRATION
V= .008333 FPM over (WETTED AREA - 1000 SF)
POND 103 INFLOW & OUTFLOW
INFILTRATION AREA 3
,75 STOR-IND METHOD
,70 PEAK STOR= 1074 CF
.65 PEAK ELEU= 106. 1 FT
.60
r .55 QIn= .78 CF5
50 Qout= .02 CFS
45 LAG= 286.3 MIN
v 40
3 .35
CD .30
-1 ,25
L- .20
, 15
. 10
.05
0,00m T N ------------
----- --� r w rn m
TIME Chours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 24
TYPE II 24-HOUR RAINFALL= 4.5 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC. m
H dro 4 52 0010 1 6-1 A li d Mi r m
POND 104
Not described
Qin = .63 CFS @ 11.90 HRS, VOLUME= .22 AF
Qout= .63 CFS @ 11.90 HRS, VOLUME= .22 AF, ATTEN= 0%, LAG= 0.0 MIN
ELEVATION AREA INC.STOR CUM.STOR - METHOD
PEAK STORAGE = 0 .00 AF
(FT) (AC) (AF) (AF) PEAK ELEVATION= 0.0 FT
FLOOD ELEVATION= 0.0 FT
START ELEVATION= 0.0 FT
SPAN= 10-20 HRS, dt=.l HRS
ROUTE INVERT OUTLET DEVICES
POND 104 INFLOW & OUTFLOW
Not described
.60 - METHOD
.55 PEAK STOR= 0.00 AF
.50 PEAK ELEU= 0 FT
.45 Qin= .63 CFS
j 40 Dout= .63 CFS
35 LAG= 0 MIN
.30
.25
CD
J .20
LL 15
, 10
.05
0.00( T N m �r �n r o� rn m
TIME (hour5)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 25
TYPE II 24-HOUR RAINFALL= 6.4 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H droCAD 4.52 001057 c 1986-1996
A li d Microcom uter Systems
SUBCATCHMENT 1 DRAINAGE AREA l: EXISTING CONDITIONS
PEAK= 5.68 CFS @ 12.14 HRS, VOLUME= .57 AF
ACRES CN SCS TR-20 METHOD
4.25 30 H.S. GROUP A: WOODS, GOOD COND. TYPE II 24-HOUR
4 .34 55 H.S. GROUP B: WOODS, GOOD COND. RAINFALL= 6 .4 IN
34 70 H.S. GROUP C: WOODS, GOOD COND. SPAN= 10-20 HRS, dt=.1 HRS
8 .93 44
Comment Tr
Method 6 .1
TR-55 SHEET FLOW
Woods: Light underbrush n=.4 L=50' P2=3 .1 in s=.12
14.6
SHALLOW CONCENTRATED/UPLAND FLOW
Woodland Kv=5 L=980' s�.05 '/' V=1.12 fps
Total Length= 1030 ft Total Tc= 20.7
SUBCATCHMENT 1 RUNOFF
DRAINAGE AREA 1 : EXISTING CONDITIONS
5.5 AREA- 8.93 AC
5.0 Tc= 20.7 MIN
4.5 CN= 44
4.0 SCS TR-20 METHOD
TYPE II 24-HOUR
3.5 RAINFALL= 6.4 IN
v 3.0
PEAK= 5.68 CFS
3 2.5 e 12, 14 HRS
CD 2.0 VOLUME= .57 AF
1 ,5
1 .0
.5
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 26
TYPE II 24-HOUR RAINFALL= 6.4 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
HydroCAD 4.52 001057 (c) 1986-1996 Applied Microcomputer Systems
SUBCATCHMENT 2 DRAINAGE AREA 2: PROPOSED CONDITIONS
PEAK= 3 .93 CFS @ 12.07 HRS, VOLUME= .33 AF
ACRES CN SCS TR-20 METHOD
2 .56 30 H.S. GROUP A: WOODS, GOOD COND. TYPE II 24-HOUR
2 .34 55 H.S. GROUP B: WOODS, GOOD COND. RAINFALL= 6.4 IN
.32 70 H.S. GROUP C: WOODS, GOOD COND. SPAN= 10-20 HRS, dt=.1 HRS
5.22 44
Method Comment Tr- (min
TR-55 SHEET FLOW 6.1
Woods: Light underbrush n=.4 L=50' P2=3.1 in s=.12 '/'
SHALLOW CONCENTRATED/UPLAND FLOW 8'6
Woodland Kv-5 L=580' s=.05 '/' V=1.12 fps
Total Length= 630 ft Total Tc= 14.7
SUBCATCHMENT 2 RUNOFF
DRAINAGE AREA 2 ; PROPOSED CONDITIONS
3.8
3.6 AREA= 5.22 AC
3,4 Tc= 14.7 MIN
3.2 CN= 44
3.0
2.8 SCS TR-20 METHOD
2.6 TYPE II 24-HOUR
2.4 RAINFALL= 6.4 IN
2.2
2.0
1 .8 PEAK= 3.93 CFS
3 1 .6 C 12.07 HRS
0 1 .4 UOLUME= .33 AF
1 .2
.e
.6
.4
.2
0.0� N (T7 V Ifl t0 I� m 6� m
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 27
TYPE II 24-HOUR RAINFALL= 6.4 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
Hydr)CAD 4.52 001057 1986-1996 A lied Microcom ut r S teas
SUBCATCHMENT 3 DRAINAGE AREA 3: PROPOSED CONDITIONS
PEAK= 11.16 CFS @ 11.92 HRS, VOLUME= .56 AF
ACRES CN SCS TR-20 METHOD
.42 98 H.S. GROUP A: IMPERVIOUS TYPE II 24-HOUR
.55 98 H.S. GROUP B: IMPERVIOUS RAINFALL= 6.4 IN
.48 39 H.S. GROUP A: LAWN SPAN= 10-20 HRS, dt=.l HRS
.45 61 H.S. GROUP B: LAWN
.16 30 H.S. GROUP A: WOODS, GOOD COND.
.36 55 H.S. GROUP B: WOODS, GOOD COND.
2.42 69
Comment Tc (min)
Method 5.6
TR-55 SHEET FLOW
Woods: Light underbrush n=.4 L=50' P2=3.1 in s=.15 1
SHALLOW CONCENTRATED/UPLAND FLOW
Unpaved Kv=16.1345 L=30' s=.3 '/' V=8.84 fps
1.4
SHALLOW CONCENTRATED/UPLAND FLOW
Paved Kv=20.3282 L=240' s=.02 '/' V=2.87 fps
Total Length= 320 ft Total Tc= 7.1
SUBCATCHMENT 3 RUNOFF
DRAINAGE AREA 3 : PROPOSED CONDITIONS
11
AREA= 2.42 AC
10 Tc= 7. 1 MIN
9 CN= 69
8 SCS TR-20 METHOD
j 7 TYPE II 24-HOUR
4- RAINFALL= 6.4 IN
U 6
5 PEAK= 11 . 16 CFS
3 O 11 .92 HRS
0 4 VOLUME= ,56 AF
-i
L. 3
2
to W m rn m
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 28
TYPE II 24-HOUR RAINFALL= 6.4 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
HydroCAD 4 52 001057 (c) 1986-1996 Applied Microcomputer Systems
SUBCATCHMENT 4 DRAINAGE AREA 4: PROPOSED CONDITIONS
PEAK= 1.60 CFS @ 11.89 HRS, VOLUME= .07 AF
ACRES CN SCS TR-20 METHOD
.08 39 H.S. GROUP A: LAWN TYPE II 24-HOUR
.22 61 H.S. GROUP B: LAWN RAINFALL= 6.4 IN
.17 55 H.S. GROUP B: WOODS, GOOD COND. SPAN= 10-20 HRS, dt=.1 HRS
.02 74 H.S. GROUP C: LAWN
.49 56
Method Comment Tc (min)
TR-55 SHEET FLOW 2.1
Grass: Short n=.15 L=40' P2=3 .1 in s=.15
SHALLOW CONCENTRATED/UPLAND FLOW •9
Woodland Kv=5 L=67 ' s=.06 '/' V=1.22- fps
Total Length= 107 ft Total Tc= 3.0
SUBCATCHMENT 4 RUNOFF
DRAINAGE AREA 4 ; PROPOSED CONDITIONS
1 .6
1 .5 AREA= .49 AC
1 .4 Tc= 3 MIN
1 .3 CN= 56
1 .2
1 . 1 SCS TR-20 METHOD
1 .0 TYPE II 24-HDUR
4- g RAINFALL= 6.4 IN
U
7 PEAK= 1 .60 CFS
<a 11 .89 HRS
� ;5 UDLUME= .07 AF
li 4
.3
.2
. 1
0,0m N r*� d to �n r m rn m
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 29
TYPE II 24-HOUR RAINFALL= 6.4 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
H droCAD 4.52 001057 c 1986-1996 ADDlied Microcom uter S tems
SUBCATCHMENT 5 DRAINAGE AREA 5: PROPOSED CONDITIONS
PEAK= .05 CFS @ 11.91 HRS, VOLUME= 0.00 AF
ACRES CN SCS TR-20 METHOD
.09 39 H.S. GROUP A: LAWN TYPE II 24-HOUR
RAINFALL= 6 .4 IN
SPAN= 10-20 HRS, dt=.l HRS
Method Comment Tc (min)
1.9
TR-55 SHEET FLOW
Grass: Short n=.15 L=20' P2=3 .1 in s=.05 '/' 5
SHALLOW CONCENTRATED/UPLAND FLOW
Unpaved Kv=16.1345 L=100' s=.05 '/' V=3.61 fps -_ -----
Total Length= 120 ft Total Tc= 2.4
SUBCATCHMENT 5 RUNOFF
DRAINAGE AREA 5 ; PROPOSED CONDITIONS
.050 AREA= .09 AC
.045 Tc= 2.4 MIN
CN= 39
.040
035 LRTASINF R-20 METHOD
II 24-HOUR
`+ .030 ALL= 6.4 IN
u
.025 AK= .05 CFS
p 020 G 11 ,91 HRS
ME= 0.00 AF
015
.0tH
.005
0.000
m to m a in �o r m m m
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER Page 30
TYPE II 24-HOUR RAINFALL= 6.4 IN
Prepared by CHRISTIANSEN & SERGI, INC. 9 Jan 98
c 1 86-19 6 A lied Microcom uter S s ems
H droCAD 4.52 0010
SUBCATCHMNT 6 DRAINAGE AREA 6: PROPOSED CONDITIONS
PEAK= 4.17 CFS @ 11.84 HRS, VOLUME= .21 AF
ACRES CN SCS TR-20 METHOD
.22 98 H.S. GROUP A: IMPERVIOUS TYPE II 24-HOUR
28 98 H.S. GROUP B: IMPERVIOUS RAINFALL= 6.4 IN
.50 98 SPAN= 10-20 HRS, dt=.1 HRS
Method Comment Tc (min)
.4
TR-55 SHEET FLOW
Smooth surfaces n=.011 L=60' P2=3 .1 in s=.15 '/' 8
CIRCULAR CHANNEL
12" Diameter a=.79 sq-ft Pw=3 .1' r=.25'
s=.005 '/' n=.009 V=4.63 fps L=220' Capacity=3.6 cfs
Total Length= 280 ft Total Tc= 1.2
SUBCATCHMENT 6 RUNOFF
DRAINAGE AREA 6 . PROPOSED CONDITIONS
4.0 AREA= .5 AC
Tc= 1 .2 MIN
3.5 CN= 98
3.0 SCS TR-20 METHOD
TYPE II 24-HOUR
c� 2.5 RAINFALL= 6.4 IN
u
" 2.0 PEAK= 4. 17 CFS
3 f 11 .84 HRS
0 1 .5 UOLUME= .21 AF
� 1 ,0
.5
N M � lfl t0 h M rn m
TIME (hour5)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 31
TYPE II 24-HOUR RAINFALL= 6.4 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H drOCAD 4.52 001057 c 1986-1996 A lied Microcom uter S terns
SUBCATCHMNT 7 DRAINAGE AREA 7 : PROPOSED CONDITIONS
PEAK= 1.39 CFS @ 11.86 HRS, VOLUME= .06 AF
ACRES CN SCS TR-20 METHOD
.14 98 H.S. GROUP A: IMPERVIOUS TYPE II 24-HOUR
.10 39 H.S. GROUP A: LAWN RAINFALL= 6.4 IN
.24 73 SPAN= 10-20 HRS, dt=.1 HRS
Method Comment Tc lm8n)
.TR-55 SHEET FLOW
Grass: Short n=.15 L=15' P2=3 .1 in s=.25 5
SHALLOW CONCENTRATED/UPLAND FLOW
Paved Kv=20.3282 L=150' s=.06 '/' V=4 .98 fps
Total Length= 165 ft Total Tc= 1.3
SUBCATCHMENT 7 RUNOFF
DRAINAGE AREA 7 : PROPOSED CONDITIONS
1 .4
1 .3 AREA= .24 AC
1 .2 - Tc= 1 .3 MIN
CN= 73
1 . i
1 .0 SCS TR-20 METHOD
j .9 TYPE II 24-HOUR
�+ .g RAINFALL= 6.4 IN
u
.7 PEAK= 1 .39 CFS
3 •6 e 11 .86 HRS
o .5 VOLUME= .06 AF
J 4
.3
.2
. I
0.0m T m v �o r m m m
TIME (hour5)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 32
TYPE II 24-HOUR RAINFALL= 6.4 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
c 1 86-1 6 A lied Microcom uter S stems
H droCAD 4.52 00105
POND 101 DETENTION/INFILTRATION AREA 1
Qin = 12.99 CFS @ 11.96 HRS, VOLUME= .89 AF
Qout= 3.70 CFS @ 12.28 HRS, VOLUME= .70 AF, ATTEN= 720, LAG= 19.1 MIN
Qpri= .10 CFS @ 12.28 HRS, VOLUME= .06 AF
Qsec= 3.60 CFS @ 12.28 HRS, VOLUME= .64 AF
ELEVATION AREA INC.STOR CUIvI.STOR STOR-IND METHOD
PEAK STORAGE = 14383 CF
(FT) (SF) (CF1 (CFl PEAK ELEVATION= 105.6 FT
102.0 1500 0 0
103.0 2950 2225 2225
FLOOD ELEVATION= 106.0 FT
START ELEVATION= 102.0 FT
104.0 4400 3675 5900
105.0 5250 4825 10725 SPAN= 10-20 HRS, dt=.1 HRS
Tdet= 114.2 MIN ( .69 AF)
106.0 6100 5675 16400
ROUTE INVERT OUTLET DEVICES
1 P 102.0' ENFILTRATION
V= .001389 FPM over (SURFACE AREA - 1500 SF)
2 S 103.7' 4" ORIFICE/GRATE
Q=.6 PI r-2 SQR(2g) SQR(H-r)
3 S 104.5' 12° ORIFICE/GRATE
Q=.6 PI r"2 SQR(2g) SQR(H-r)
Primary Discharge
i--1=Exf i ltrat ion
Secondary Discharge
f--2=Orif ice/Grate
I 3=Orifice/Grate
POND 101 INFLOW & OUTFLOW
DETENTION/INFILTRATION AREA 1
13
12 STOR-IND METHOD
11 PEAK STOR= 14383 CF
PEAK ELEU= 105.6 FT
10
9 Qin= 12.99 CFS
Qout= 3.70 CFS
c� 8 Qpri= . 10 CFS
L) 7 Qsec= 3.60 CFS
6 LAG= 19. 1 MIN
3 5
O
_I 4
3 i
2
Om N-- -- -- Ln r m rn mN
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 33
TYPE II 24-HOUR RAINFALL= 6.4 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H droCAD 4.52 001057 c 1 86-1996 A lied Mi rococo uter stems
POND 102 INFILTATION AREA 2
Qin = 4.17 CFS @ 11.84 HRS, VOLUME= .21 AF
Qout= .07 CFS @ 16 .39 HRS, VOLUME= .05 AF, ATTEN= 980, LAG= 272 .9 MIN
ELEVATION CON.AREA INC.STOR CUM.STOR WET.AREA STOR-IND METHOD
(FT) (SF) (CF) (CF) (SF) PEAK STORAGE = 7040 CF
106.0 2400 0 0 2400 PEAK ELEVATION= 108.9 FT
110.0 2401 9602 9602 3095 FLOOD ELEVATION= 110.0 FT
START ELEVATION= 106.0 FT
SPAN= 10-20 HRS, dt=.1 HRS
Tdet= 283.8 MIN ( .05 AF)
ROUTE INVERT OUTLET DEVICES
1 P 106.0' EBFILTRATION
V= .008333 FPM over (WETTED AREA - 2400 SF)
POND 102 INFLOW & OUTFLOW
INFILTATION AREA 2
4.0 STOR-IND METHOD
PEAK STDR= 7040 CF
3.5 PEAK ELEU= 108.9 FT
3.0 Din= 4, 17 CFS
`l Qout= .07 CFS
to 2.5 LAG= 272.9 MIN
u
" 2.0
3
O 1 .5
-i
LL
.5
Li 0.0 0 N-- M --'--Ln �0 r m M 0
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 34
TYPE II 24-HOUR RAINFALL= 6.4 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H drOCAD 4.52 001057 c 1 86-1996 Applied Microcom uter S stems
POND 103 INFILTRATION AREA 3
Qin = 1.39 CFS @ 11.86 HRS, VOLUME= .06 AF
Qout= .03 CFS @ 15.81 HRS, VOLUME= .02 AF, ATTEN= 980, LAG= 236.7 MIN
ELEVATION CON.AREA INC.STOR CUM.STOR WETSAREA PEAK STORAGE THOD 1955 CF
(FT) (SF) (CF) (CF
105.0 1000 0 0 1000 PEAK ELEVATION= 107.0 FT
108 .0 1001 3001 3001 1336 START ELEVATION= 105.0 FT
SPAN= 10-20 HRS, dt=.1 HRS
Tdet= 261.2 MIN ( .02 AF)
ROUTE INVERT OUTLET DEVICES
1 P 105.0, ENFILTRATION
V= .008333 FPM over (WETTED AREA - 1000 SF)
POND 103 INFLOW & OUTFLOW
INFILTRATION AREA 3
1 .4
1 .3 STOR-IND METHOD
1 .2 PEAK STOR= 1955 CF
1 1 PEAK ELEU= 107 FT
1 .0 Din= 1 ,39 CFS
� .9 Dout= .03 CFS
c., B LAG= 236.7 MIN
L)
.7
3 .6
0 5
LL
.3
.2
TIME (hours)
Data for LOT 1-2B ORCHARD HILL ROAD, NORTH ANDOVER
Page 35
TYPE II 24-HOUR RAINFALL= 6.4 IN 9 Jan 98
Prepared by CHRISTIANSEN & SERGI, INC.
H droCAD 4. 2 001057 c 198 -1 96 A lied Microcom uter S tems
POND 104
Not described
Qin = 3 .82 CFS @ 12.25 HRS, VOLUME= .72 AF
Qout= 3.82 CFS @ 12.25 HRS, VOLUME= .72 AF, ATTEN= 0%, LAG= 0.0 MIN
ELEVATION AREA INC.STOR CUM.STOR - METHOD
(FT) (AC) (AF) (AF) PEAK STORAGE = 0.00 AF
PEAK ELEVATION= 0.0 FT
FLOOD ELEVATION= 0.0 FT
START ELEVATION= 0.0 FT
SPAN= 10-20 HRS, dt=.1 HRS
ROUTE INVERT OUTLET DEVICES
POND 104 INFLOW- & OUTFLOW
Not deacrlbed
3.6
3.6 - METHOD
3.4 PEAK STDR= 0.00 AF
3.2 PEAK ELEU= 0 FT
3.0
2.8 Din= 3.82 CFS
r` 2.6 Qout= 3.82 CFS
0) 2.4
c,_ 2 2 LAG= 0 MIN
v 2.0
1 .8
O 1 .4
J 1 .2
L- 1 .0
.8
.6
,4
.2
0.0m N m v to r m rn m
TIME (hours)
CHRISTIANSN & SERGI, INC.
PROFESSIONAL ENGINEERS AND LAND SURVEYORS
160 SUMMER STREET HAVERHILL, MASSACHUSETTS 01830-6318 (978)373-0310 FAX: (978)372-3960
SOIL TEST RESULTS
LOT 1-26 ORCHARD HILL ROAD: TEST PIT RESULTS
DATE OF TESTS:OCTOBER 15,1997
TEST PIT#1
DEPTH SOIL HORIZON SOIL TEXTURE SOIL COLOR SOIL MOTTLING COMMENTS
p_
Ap FINE SANDY LOAM 10YR3/1 MASSIVE,FRIABLE
6'-28„ Bw LOAMY FINE SAND 2.5Y5/6 MASSIVE,FRIABLE
28"-46' Cl GRAVELLY FINE 2.5Y5/5 MASSIVE TO
TO MEDIUM SAND GRANULAR,FRIABLE,
FEW ROOTS TO 45"
45'-123' C2 LOAMY SAND WITH 2.5Y5/4 REDOX. MASSIVE,FRIABLE
POCKETS OF SANDY BELOW 45"
LOAM AND SAND
123"-140" C3 SANDY LOAM 5Y5/1 MASSIVE,FRIABLE
ESTIMATED SEASONAL HIGH WATER TABLE=45'
NO GROUNDWATER SEEPAGE,NO REFUSAL
TEST PIT#2
DEPTH SOIL HORIZON SOIL TEXTURE SOIL COLOR SOIL MOTTLING COMMENTS
0-1p" Ap FINE SANDY LOAM 10YR3/1 MASSIVE,FRIABLE
I CY'-31" Bw FINE SANDY LOAM 2.5Y5/6 MASSIVE,FRIABLE
31"-138" C1 SANDY LOAM 2.5Y5/4 REDOX. MASSIVE,FRIABLE
BELOW 30" TO FIRM
FEW ROOTS TO 35'
138"-154' 1 C2 SANDY LOAM 5Y5/1 MASSIVE,FRIABLE
ESTIMATED SEASONAL HIGH WATER TABLE=30"
NO GROUNDWATER SEEPAGE,NO REFUSAL
TEST PIT#3
DEPTH SOIL HORIZON SOIL TEXTURE SOIL COLOR SOIL MOTTLING COMMENTS
0-91 A FINE SANDY LOAM 10YR3/1 MASSIVE,FRIABLE
10"-23' Bw FINE SANDY LOAM 2.5Y5/6 MASSIVE,FRIABLE
23"-150" Cl STRATIFIED SANDS AND 2.5Y5/4 REDOX. GRANULAR TO
LOAMY SANDS WITH BELOW 45" MASSIVE,FRIABLE,
POCKETS OF GRAVELLY FEW ROOTS TO 54'
SAND AND SANDY LOAM
ESTIMATED SEASONAL HIGH WATER TABLE=46'
NO GROUNDWATER SEEPAGE,NO REFUSAL
LOT 1-2B ORCHARD HILL ROAD: TEST PIT RESULTS
TEST PIT#4
DEPTH SOIL HORIZON SOIL TEXTURE SOIL COLOR SOIL MOTTLING COMMENTS
0-8" A
FINE SANDY LOAM 10YR3/1 MASSIVE,FRIABLE
8"-31" Bw
FINE SANDY LOAM 2.5Y5/6 MASSIVE FRIABLE
31"-50" Cl GRAVELLY LOAMY 2.5Y5/5 REDOX. GRANULAR TO
SAND BELOW 48" MASSIVE FRIABLE,
FEW ROOTS TO 54'
5a'-124' C2
SANDY LOAM WITH 2.5Y5/4 MASSIVE,FRIABLE
POCKETS OF LOAMY
SAND
ESTIMATED SEASONAL HIGH WATER TABLE=48"
NO GROUNDWATER SEEPAGE,NO REFUSAL
TEST PIT#5
DEPTH SOIL HORIZON SOIL TEXTURE SOIL COLOR SOIL MOTTLING COMMENTS
0-8" A
FINE SANDY LOAM MASSIVE,FRIABLE
8"-25' Bw
FINE SANDY LOAM 2.5Y5/5 MASSIVE,FRIABLE
267-33- Cl GRAVELLY SAND 2.5Y5/6 REDOX. GRANULAR,LOOSE
BELOW 34'
SANDY LOAM 2.5Y5/4 MASSIVE,FRIABLE
-� C2 TO FIRM
ESTIMATED SEASONAL HIGH WATER TABLE=34'
NO GROUNDWATER SEEPAGE,NO REFUSAL
TEST PIT#6
DEPTH SOIL HORIZON SOIL TEXTURE SOIL COLOR SOIL MOTTLING COMMENTS
A
FINE SANDY LOAM MASSIVE,FRIABLE
la'-27' Bw
FINE SANDY LOAM MASSIVE,FRIABLE
27'_47H Cl GRAVELLY LOAMY REDOX. GRANULAR TO
SAND BELOW 36' MASSIVE,FRIABLE,
FEW ROOTS TO 36'
47-132" C2
SANDY LOAM MASSIVE FRIABLE
ESTIMATED SEASONAL HIGH WATER TABLE=36'
NO GROUNDWATER SEEPAGE,NO REFUSAL
LOT 1-213 ORCHARD HILL ROAD: TEST PIT RESULTS
TEST PIT#7
DEPTH SOIL HORIZON SOIL TEXTURE SOIL COLOR SOIL MOTTLING COMMENTS
0-111, A FINE SANDY LOAM MASSIVE,FRIABLE
1'1"-27 Bw FINE SANDY LOAM MASSIVE FRIABLE
2T'-62" Cl GRAVELLY LOAMY REDOX. GRANULAR TO
SAND BELOW 42" MASSIVE FRIABLE,
FEW ROOTS TO 42"
62"-136" C2 SANDY LOAM MASSIVE,FRIABLE
ESTIMATED SEASONAL HIGH WATER TABLE=42"
NO GROUNDWATER SEEPAGE,NO REFUSAL
TEST PIT#8
DEPTH SOIL HORIZON SOIL TEXTURE SOIL COLOR SOIL MOTTLING COMMENTS
0-61 A FINE SANDY LOAM MASSIVE,FRIABLE
5'-26' Bw FINE SANDY LOAM MASSIVE,FRIABLE
26'-85' Cl LOAMY SAND REDOX. GRANULAR TO
BELOW 72" MASSIVE,FRIABLE,
FEW ROOTS TO 72"
a&'-12T-L C2 SANDY LOAM MASSIVE,FRIABLE
ESTIMATED SEASONAL HIGH WATER TABLE=72"
NO GROUNDWATER SEEPAGE,NO REFUSAL
TEST PIT#9
DEPTH SOIL HORIZON SOIL TEXTURE SOIL COLOR SOIL MOTTLING COMMENTS
0-101, A FINE SANDY LOAM MASSIVE,FRIABLE
la'-39' Bw LOAMY FINE SAND MASSIVE,FRIABLE
3a'-115' Cl FINE TO MEDIUM GRANULAR,LOOSE
SAND
115'-150" C2 LOAMY SAND MASSIVE,FRIABLE
ESTIMATED SEASONAL HIGH WATER TABLE=115"
GROUNDWATER SEEPAGE AT 135',NO REFUSAL
LOT 1-2B ORCHARD HILL ROAD: TEST PIT RESULTS
TEST PIT#10
DEPTH SOIL HORIZON SOIL TEXTURE SOIL COLOR SOIL MOTTLING COMMENTS
Ap FINE SANDY LOAM MASSIVE,FRIABLE
19'-27' Bw LOAMY FINE SAND MASSIVE FRIABLE
27'-90" Cl FINE TO MEDIUM HIGH CHROMA GRANULAR,LOOSE
SAND BAND AT 48"
REDOX.
99'-126' C2 LOAMY SAND BELOW 90" MASSIVE,FRIABLE
ESTIMATED SEASONAL HIGH WATER TABLE=90"
NO GROUNDWATER SEEPAGE,NO REFUSAL
TEST PIT#11
DEPTH SOIL HORIZON SOIL TEXTURE SOIL COLOR SOIL MOTTLING COMMENTS
0-8" Ap FINE SANDY LOAM MASSIVE,FRIABLE
8^-24° Bw LOAMY FINE SAND MASSIVE,FRIABLE
E422 Cl FINE TO MEDIUM GRANULAR,LOOSE
SAND
REDOX.
C2 SANDY LOAM BELOW 42" MASSIVE,FRIABLE
ESTIMATED SEASONAL HIGH WATER TABLE=42"
NO GROUNDWATER SEEPAGE,NO REFUSAL
TEST PIT#12
DEPTH SOIL HORIZON SOIL TEXTURE SOIL COLOR SOIL MOTTLING COMMENTS
Ap FINE SANDY LOAM MASSIVE,FRIABLE
10"-27' Bw FINE SANDY LOAM MASSIVE,FRIABLE
27"-40" Cl LOAMY SAND MASSIVE,FRIABLE
REDOX.
qp"-g0" C2 SANDY LOAM BELOW q0" MASSIVE,FRIABLE
ESTIMATED SEASONAL HIGH WATER TABLE=40"
NO GROUNDWATER SEEPAGE,NO REFUSAL
LOT 1-213 ORCHARD HILL ROAD: TEST PIT RESULTS
PERC TEST#1
DEPTH OF TEST=52"(IN C2 HORIZON)
SOAK 11:03
12" 11:18
9" 11:26
5' 11:38
PERC RATE=4 MINUTES PER INCH
PERC TEST#3
DEPTH OF TEST=61"(IN Cl HORIZON)
SOAK 11:40
12" 11:55
9" 12:15
5' 12:38
PERC RATE=8 MINUTES PER INCH
NOTES:
1. SOIL EVALUATION PERFORMED BY DANIEL O'CONNELL
2. TEST PITS 1, 2, AND 3 WERE WITNESSED BY HEALTH AGENT SUSAN FORD
3. PERC TESTS 1 AND 3 WERE WITNESSED BY HEALTH AGENT RUDY ROTOLO