20061554 Ver 1_Stormwater Plans_20080124

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STORMWATER MANAGEMENT PLAN (SMP)
WATER QUALITY AND DETENTION CALCULATIONS
FoR
DEB ~.~.~ACRE I~IV~I CORNER
CES( PROJECT 071021.000
DATE: JANUARY 22, 2008
~~~~~NlCAR~~~~~i
~~~~ pF~s
PROJECT MANAGER: DAVID REESE, PE - 332216 ~ ~o ~ 0~
PROJECT ENGINEER: JEREMIA S. MURPHY, P.E.
Q-.'~a
~~i~~p ' : yGI NEB 'Q`~,\\~~
/,~~,y~A ~S i'MV~~~~
PO Box 268 ~ l-~ ~ ~ ~~~ ~~~~
CONCORD, NC 28026-0268 ~~~ w~'~
JAN 2 4 2008
DENR - WATER QUAUT7
WcTIANDS AND ST(KZMWATER BRANCh

WATER QUALITY AND DETENTION

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u
CES~

EB SWM Plan CESI Land Development Services
OB NO.: mo2f.oao BY: usn~ P.O. Box 268
ATE: otoz.oe P.M.: s=aR Concord, NC 28026
REVISED: WATER QUALITY DESIGN
^
~IVATER QUALITY REQUIREMENTS FOR BASIN #1
To meet the Water Quality requirements, the procedure outlined in the "Stormwater Best Management Practio
ublished by NCDENR will be used. This guide gives the required pond surface area and storage volume
meet an 85 % pollutant removal efficiency. Also, the pond must detain the first 1" of rainfall and release
is volume over a period of 2 to 5 days. Calculations for these requirements are as follows:
urface area re uirements
rainage area to pond (Da)= 36.89 Ac
ost-development impervious percentage = g0%
Average pool depth = 4.5 ft
Designed permanent pool elevation = 858,5
~rom table 1.1 in the BMP guidelines the required Surface Area to Drainage Area
atio (SA/DA) for a permanent pool depth of 4.5 feet =
~equired surface area = SA/DA / 100 x Drainage area=
urface area of pond as designed at permanent pool elevation =
" rainfall requirements
sing the runoff volume calculations in the "Simple Method"
PERA+IANEPIT PpOL DEPTH
Imp. 3 4 ~ g 7 8 9
10% 0.59 0.49 0.43 0.35 0.31 0.29 0.26
20% 0.97 0.79 0.70 0.59 0.51 0.46 0.44
30% 1.34 1.08 0.97 0.83 0.70 0.64 0.62
40% 1.73 1.43 1.25 1.05 0.90 0.82 0.77
50% 2.06 1.73 1.50 1.30 1.09 1.00 0.92
60% 2.40 2.03 1.71 1.51 1.29 1.18 1.10
70% 2.88 2.40 2.07 1.79 1.54 1.35 1.26
80% 3.36 2.78 2.38 2.10 1.86 1.60 1.42
90% 3.74 3.10 2.66 2.34 2.11 1.83 1.67
2.88
1.06 Ac
46,280
1.12 Ac
48,973 s.f.
Rv = 0.05 + .009 (I)
Rv= 0.86 in/in
~olume = (Design rainfall) (Rv) (Drainage Area)
olume = 1" rainfall x Rv in/in x 1/12 in/ft x Da = 2.64 ac-ft
or 115,163 ft^3
his volume must be released over a period of 2-5 days
low Calculations: (Detention calculations were performed with Hydraflow Hydrographs 2007 and utilize SCS method)

BMP WET DETENTION POND STAGE STORAGE SUMMARY
ater Qua1R Basin Stara ®Volumes
E4evatiDn "1 Ar~~" free ~ 'lo!~~ne dolurne
- '. 1243 ).0000
..659 ~ 3.2298 ~ 25,u35 0.5886
nn: 12949 80,f_:_C .8509
<66 t 1.3613 l 138,480`, ' 3.1791
- ~ 1290 195.254 4.5742
3C ^ I f 5.L53 1.4980 ~ ~ .263:005 6:0378
1.5683 329,789 7.5709
665 ~1,433~ 1.8399 r 399,683 ~-1750
- ~--'.o1i% 1.7127 472,683 10.8513
~ ..
Fluvatinn Intnrnnl atin..
Elev Stora e Volume Stora e:Area
660
660.7
661 80,626
120,818
138,480 56,408
58,42fi
59,300
toga a ele . 2.20 ff.-above erm: 001 elev.
Q Stora e Elev. = 660.70 To of Box ~ fi64.30
ination of Orifice size for 2-5 day drawdown
a= 2Ax SEaI't(hj F-~~I„g ~~a;: equa~ior
ct{sgrt{2t~} i
a= Area of orifice a sgft
t= Time to drawdown 172800 sec
A= Average pond surface area 53700 sf
g= Gravity constant 322 ftls^2
h= Change in head 2.20 ft
C= Orifice constant 0.6
?+riaximamo~ficearea- 01615 sgft
_Maximiam orificeBtze = 6 inche
~/OLUME BELOW PERMANENT POOL
2 day min.
s (2 day d
T~18iiiP~nd rorebay~' RxeL~:'?+t _ TOTAL
Navation
hncll Rrea
Sfl Volume
!~o4t~ Area
isfl Volun~,e
icy-f0 Nree
isfl Vo~.um E~
fcu-hi Volume

fcu-ftj
I
~U
...- ~ -- - ... =.838 <'..~53 2,269 -
- - t g - x,330 _ 3.185 _5;139 _
~
C ~ ~ 1 ~h6 95.784 ;6 ~ ~ 541 b&2 8,673 --
127,97& :.i0 - ~ 1@;936 ~C 445
658.5 36.010 145,311 6.901 18,609 6,055 15,610 179,530

i ~~ai i uicuay vViun~C JY,L ly
Forebay Volume 19.06%
Volume at top of shelf 205,166

Hydraflow Table of Contents Detention 01-22-08.gpw
' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hydrograph Return Period Recap .................................................................... 1
1 -Year
Summary Report ...............................................................................................................
Hydrograph Reports ......................................................................................................... . 2
. 3
Hydrograph No. 1, SCS Runoff, Offsite DA 1 .................................................................. 3
TR-55 Tc Worksheet ...................................................................................................

Hydrograph No. 2, SCS Runoff, Offsite DA 2 ................................................................. 5
.
TR-55 Tc Worksheet ................................................................................................... 6
' Hydrograph No. 3, SCS Runoff, Site PreDevelopment-DA 1 ......................................... . 7
TR-55 Tc Worksheet .................................................................................................. . 8
Hydrograph No. 4, SCS Runoff, Site PreDevelopment-DA 2 ......................................... . 9
' TR-55 Tc Worksheet ................................................................................................. 0
Hydrograph No. 5, Combine, Total Pre Development Point A ...................................... 1
Hydrograph No. 6, Combine, Site Pre Combined .......................................................... 12
' Hydrograph No. 7, SCS Runoff, Site Post Development ............................................... 13
Hydrograph No. 8, Reservoir, BMP Pond Routed ......................................................... 14
Pond Report -DEB SWM BMP WQ Orifice~ .............................................................. 15
' Hydrograph No. 9, Combine, Total Post to Point A ....................................................... 17
2 -Year
'

' Summary Report ..............................................................................................................
Hydrograph Reports ........................................................................................................
Hydrograph No. 1, SCS Runoff, Offsite DA 1 ................................................................
Hydrograph No. 2, SCS Runoff, Offsite DA 2 ................................................................ 18
19
19
20
Hydrograph No. 3, SCS Runoff, Site PreDevelopment-DA 1 ........................................ 21

' Hydrograph No. 4, SCS Runoff, Site PreDevelopment-DA 2 ........................................
Hydrograph No. 5, Combine, Total Pre Development Point A ...................................... 22
23
Hydrograph No. 6, Combine, Site Pre Combined .......................................................... 24

' Hydrograph No. 7, SCS Runoff, Site Post Development ...............................................
Hydrograph No. 8, Reservoir, BMP Pond Routed .........................................................
Hydrograph No. 9, Combine, Total Post to Point A ....................................................... 25
26
27
' 10 -Year
Summary Report .............................................................................................................. 28
Hydrograph Reports ........................................................................................................ 29
' Hydrograph No. 1, SCS Runoff, Offsite DA 1 ................................................................ 29
Hydrograph No. 2, SCS Runoff, Offsite DA 2 ................................................................ 30
Hydrograph No. 3, SCS Runoff, Site PreDevelopment-DA 1 ........................................ 31
' Hydrograph No. 4, SCS Runoff, Site PreDevelopment-DA 2 ........................................ 32
Hydrograph No. 5, Combine, Total Pre Development Point A ...................................... 33
Hydrograph No. 6, Combine, Site Pre Combined .......................................................... 34
' Hydrograph No. 7, SCS Runoff, Site Post Development ............................................... 35
Hydrograph No. 8, Reservoir, BMP Pond Routed ......................................................... 36
Hydrograph No. 9, Combine, Total Post to Point A ....................................................... 37
' 50 -Year

Contents continued... Detention 01-22-08.gpw
' Summary Report .............................................................................................................. 38
Hydrograph Reports ........................................................................................................ 39
Hydrograph No. 1, SCS Runoff, Offsite DA 1 ................................................................ 39
Hydrograph No. 2, SCS Runoff, Offsite DA 2 ................................................................ 40
Hydrograph No. 3, SCS Runoff, Site PreDevelopment-DA 1 ........................................ 41
' Hydrograph No. 4, SCS Runoff, Site PreDevelopment-DA 2 ........................................ 42
Hydrograph No. 5, Combine, Total Pre Development Point A ...................................... 43
Hydrograph No. 6, Combine, Site Pre Combined .......................................................... 44
' Hydrograph No. 7, SCS Runoff, Site Post Development ::::.::. :::.:.:::.:.::.::::...::::.::.:::..: 45
Hydrograph No. 8, Reservoir, BMP Pond Routed 46
Hydrograph No. 9, Combine, Total Post to Point A ....................................................... 47

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Hydrograph Return Period Recap
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Hydraflow Hvdrograohs by Intelisolve v9.1
Hyd. Hydrograph Inflow Peak Outflow (cfs) Hydrograph
No t
e H
d
. yp y
(s) description
(origin) 1-Yr 2-Yr 3-Yr 5-Yr 10-Yr 25-Yr 50-Yr 100-Yr
1 SCS Runoff ------- 292.27 415.52 ------- ------- 769.63 ------- 093.68 ------- Offsite DA 1
2 SCS Runoff ------- 82.57 104.34 ------- ------- 162.08 ------- 212.19 ------- Offsite DA 2
3 SCS Runoff ------- 5.401 13.21 ------- ------- 43.30 ------- 75.59 ------- Site PreDevelopment-DA 1
4 SCS Runoff ------- 2.578 6.250 ------- ------- 19.76 ------- 34.09 ------- Site PreDevelopment-DA 2
5 Combine 1, 2, 3, 4 321.61 454.13 ------- ------- 834.53 ------- 183.11 ------- Total Pre Development Point A
6 Combine 3, 4, 7.709 18.91 ------- ------- 61.43 ------- 106.97 ------- Site Pre Combined
7 SCS Runoff ------- 118.10 148.63 ------- ------- 229.34 ------- 299.19 ------- Site Post Development
8 Reservoir 7 1.737 1.974 ------- ------- 12.47 ------- 102.98 ------- BMP Pond Routed
9 Combine 1, 2, 8 320.37 450.94 ------- ------- 827.46 ------- 204.54 ------- Total Post to Point A
Proj. file: Detention 01-22-08.gpw Tuesday, Jan 22, 2008

Hydrograph Summary Report

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Hydraflow Hydrographs by Intelisolve v9.1
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
interval
(min) Time to
peak
(min) Hyd.
volume
(cult) Inflow
hyd(s) Maximum
elevation
(ft) Total
strge used
(tuft) Hydrograph
description
1 SCS Runoff 292.27 1 749 1,911,851 ---- ------ ------ Offsite DA 1
2 SCS Runoff 82.57 1 728 297,776 ---- ------ ------ Offsite DA 2
3 SCS Runoff 5.401 1 727 29,386 ---- ------ ------ Site PreDevelopment-DA 1
4 SCS Runoff 2.578 1 723 11,077 ---- ------ ------ Site PreDevelopment-DA 2
5 Combine 321.61 1 747 2,250,090 1, 2, 3, 4 ------ ------ Total Pre Development Point A
6 Combine 7.709 1 725 40,463 3, 4, ------ ------ Site Pre Combined
7 SCS Runoff 118.10 1 719 276,769 ---- ------ ------ Site Post Development
8 Reservoir 1.737 1 1105 196,809 7 662.13 207,240 BMP Pond Routed
9 Combine 320.37 1 747 2,406,437 1, 2, 8 ------ ------ Total Post to Point A
Detention 01-22-08.gpw Return Period: 1 Year Tuesday, Jan 22, 2008

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Hydrograph Report

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 1
' Offsite DA 1
Hydrograph type = SCS Runoff Peak discharge = 292.27 cfs
Storm frequency = 1 yrs Time to peak = 749 min
Time interval = 1 min Hyd. volume = 1,911,851 cult
Drainage area = 449.650 ac Curve number = 80
Basin Slope = 0.0 % Hydraulic length = 0 ft
1 Tc method = TR55 Time of conc. (Tc) = 58.60 min
Total precip. = 2.90 in Distribution = Type II
' Storm duration = 24 hrs Shape factor = 484

' Offsite DA 1
Q (cfs) Hyd. No. 1 -- 1 Year Q (cfs)
32
' 0.00
' 280.00
' 240.00
' 200.00
' 160.00
' 120.00
' 80.00
40.00
0.00
320.00
280.00
240.00
200.00
160.00
120.00
80.00
40.00
0.00
' 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 1 Time (min)

TR55 Tc Worksheet
4
Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 1
Offsite DA 1
Description A B C Totals
Sheet Flow
Manning's n-value = 0.400 0.011 0.011
Flow length (ft) = 200.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.50 3.50 0.00
Land slope (%) = 2.00 0.00 0.00
Travel Time (min) = 35.75 + 0.00 + 0.00 = 35.75
Shallow Concentrated Flow
Flow length (ft) = 146.00 0.00 0.00
Watercourse slope (%) = 9.60 0.00 0.00
Surface description =Unpaved Paved Paved
Average velocity (ft/s) = 5.00 0.00 0.00
Travel Time (min) = 0.49 + 0.00 + 0.00 = 0.49
Channel Flow
X sectional flow area (sgft) = 3.00 101.00 3.00
Wetted perimeter (ft) = 5.47 10.20 5.47
Channel slope (%) = 2.00 0.78 0.98
Manning's n-value = 0.030 0.024 0.030
Velocity (ftls) = 4.70 25.48 3.29
Flow length (ft) = 3665.0 101.0 1839.0
Travel Time (min) = 13.01 + 0.07 + 9.32 = 22.39
Total Travel Time, Tc .............. ................................................................ 58.60 min

Hydrograph Report
5
' Hydraflow Hydrographs by Intelisolve v9.1
Hya. No. 2
' Offsite DA 2
Hydrograph type = SCS Runoff
Storm frequency = 1 yrs
' Time interval = 1 min
Drainage area = 39.690 ac
Basin Slope = 0.0
' Tc method = TR55
Total precip. = 2.90 in
' Storm duration = 24 hrs
Tuesday, Jan 22, 2008
Peak discharge = 82.57 cfs
Time to peak = 728 min
Hyd. volume = 297,776 cult
Curve number = 92
Hydraulic length = 0 ft
Time of conc. (Tc) = 25.30 min
Distribution = Type II
Shape factor = 484
' Offsite DA 2
Q (cfs) Hyd. No. 2 -- 1 Year
' 90.00
80.00 _ _ _ _ ___
70.00
E
60.00
50.00
L '
40.00
I_ ~
30.00
__
' 20.00
10.00
I
i ~
0 00 ~ I_ L
Q (cfs)
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
' ~ o.oo
0 120 240 360 480 600 720 840 960 1080. 1200 1320 1440 1560
Hyd No. 2 Time (min)

TR55 Tc Worksheet
6
Hydraflow Hydrographs by Intefisolve v9.1
Hyd. No. 2
Offsite DA 2
Description A B C Totals
Sheet Flow
Manning's n-value = 0.240 0.011 0.011
Flow length (ft) = 100.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.50 3.50 0.00
Land slope (%) = 2.00 0.00 0.00
Travel Time (min) = 13.64 + 0.00 + 0.00 = 13.64
Shallow Concentrated Flow
Flow length (ft) = 262.00 0.00 0.00
Watercourse slope (%) = 2.00 0.00 0.00
Surface description =Paved Paved Paved
Average velocity (ft/s) = 2.87 0.00 0.00
Travel Time (min) = 1.52 + 0.00 + 0.00 = 1.52
Channel Flow
X sectional flow area (sgft) = 3.14 3.00 0.00
Wetted perimeter (ft) = 6.28 5.47 0.00
Channel slope (%) = 1.00 1.60 0.00
Manning's n-value = 0.013 0.030 0.015
Velocity (ft/s) = 7.20 4.20 0.00
Flow length (ft) = 1632.0 1612.0 0.0
Travel Time (min) = 3.78 + 6.40 + 0.00 = 10.17
Total Travel Time, Tc .............................................................................. 25.30 min

' Hydrograph Report
' Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 3
' Site PreDevelopment-DA 1
Hydrograph type = SCS Runoff
Storm frequency = 1 yrs
' Time interval = 1 min
Drainage area = 26.830 ac
Basin Slope = 0.0
' Tc method = TR55
Total precip. = 2.90 in
' Storm duration = 24 hrs
7
Tuesday, Jan 22, 2008
Peak discharge = 5.401 cfs
Time to peak = 727 min
Hyd. volume = 29,386 cult
Curve number = 60
Hydraulic length = 0 ft
Time of conc. (Tc) = 15.50 min
Distribution = Type II
Shape factor = 484
' Q (cfs)
' 6.00
' 5.00
4.00
L __
3.00
I
I
' 2.00
' 1.00 L
1 ~~
0.00
Site PreDevelopment-DA 1
Hyd. No. 3 -- 1 Year
Q (cfs)
6.00
5.00
4.00
3.00
2.00
1.00
0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 3

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1
1
1
1
1
1
1
1
1
1
1
TR55 Tc Worksheet
8
Hydraflow Hydrographs by Intelisolve vg.1
Hyd. No. 3
Site PreDevelopment-DA 1
Description A B C Totals
Sheet Flow
Manning's n-value = 0.240 0.011 0.011
Flow length (ft) = 200.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.50 3.50 0.00
Land slope (%) = 10.50 0.00 0.00
Travel Time (min) = 12.24 + 0.00 + 0.00 = 12.24
Shallow Concentrated Flow
Flow length (ft) = 124.00 0.00 0.00
Watercourse slope (%) = 13.70 0.00 0.00
Surface description =Unpaved Paved Paved
Average velocity (ft/s) = 5.97 0.00 0.00
Travel Time (min) = 0.35 + 0.00 + 0.00 = 0.35
Channel Flow
X sectional flow area (sgft) = 3.00 0.00 0.00
Wetted perimeter (ft) = 5.47 0.00 0.00
Channel slope (%) = 3.30 0.00 0.00
Manning's n-value = 0.030 0.015 0.015
Velocity (ft/s) = 6.03 0.00 0.00
Flow length (ft) _ .1043.0 0.0 0.0
Travel Time (min) = 2.88 + 0.00 + 0.00 = 2.88
Total Travel Time, Tc .............................................................................. 15.50 min

1 9
Hydrograph Report

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 4
Site PreDevelopme nt-DA 2
Hydrograph type = SCS Runoff Peak discharge = 2.578 cfs
' Storm frequency = 1 yrs Time to peak = 723 min
Time interval = 1 min Hyd. volume = 11,077 cult
Drainage area = 10.060 ac Curve number = 60
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 10.90 min
Total precip. = 2.90 in Distribution =Type II
' Storm duration = 24 hrs Shape factor = 484

' Site PreDevelopment-DA 2
Q (cfs) Hyd. No. 4 -- 1 Year Q (cfs)
30
3.00
1
j ~ i II ~ ~ I ~
__ _ I _ __
2.00 2.00
~ ~ _ '
I
i
I ~ I ~ ~ I I II
1.00 ~ ~
~ ~ i ~ ~ ~ 1.00
__
~ I
__
~_
0.00 ~
' ' 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 4 Time (min)

1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
TR55 Tc Worksheet
10
Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 4
Site PreDevelopment-DA 2
Description A B C Totals
Sheet Flow
Manning's n-value = 0.240 0.011 0.011
Flow length (ft) = 150.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.50 3.50 0.00
Land slope (%) = 10.70 0.00 0.00
Travel Time (min) = 9.65 + 0.00 + 0.00 = 9.65
Shallow Concentrated Flow
Flow length (ft) = 65.00 0.00 0.00
Watercourse slope (%) = 16.90 0.00 0.00
Surface description =Unpaved Paved Paved
Average velocity (ft/s) = 6.63 0.00 0.00
Travel Time (min) = 0.16 + 0.00 + 0.00 = 0.16
Channel Flow
X sectional flow area (sgft) = 3.00 0.00 0.00
Wetted perimeter (ft) = 5.47 0.00 0.00
Channel slope (%) = 4.60 0.00 0.00
Manning's n-value = 0.030 0.015 0.015
Velocity (ft/s) = 7.12 0.00 0.00
Flow length (ft) = 474.0 0.0 0.0
Travel Time (min) = 1.11 + 0.00 + 0.00 = 1.11
Total Travel Time, Tc .............................................................................. 10.90 min

~,
Hydrograph
Report 11

Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 5
' Total Pre Development Point A
Hydrograph type =Combine Peak discharge = 321.61 cfs
' Storm frequency = 1 yrs Time to peak = 747 min
Time interval = 1 min Hyd. volume = 2,250,090 cult
Inflow hyds. = 1, 2, 3, 4 Contrib. drain. area= 526.230 ac

' Total Pre Development Point A
Q (cfs)
Hyd. No. 5 -- 1 Year
Q (cfs)
350.00
' 300.00
250.00
' 200.00
' 150.00
100.00
50.00
0.00
350.00
300.00
250.00
200.00
150.00
100.00
50.00
' 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 5 Hyd No. 1 Hyd No. 2 Hyd No. 3
' Hyd No. 4

~ 12
Hydrograph Report
Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 6
Site Pre Combined
Hydrograph type = Combine Peak discharge = 7.709 cfs
Storm frequency = 1 yrs Time to peak = 725 min
Time interval = 1 min Hyd. volume = 40,463 cult
Inflow hyds. = 3, 4 Contrib. drain. area= 36.890 ac
Q (cfs)
8.00
6.00
4.00
2.00
Q (cfs)
8.00
6.00
4.00
2.00
_ 0.00 ~ ~ ~ ~ ~ ,, ~ ~ ~ ~ ~ 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 6 Hyd No. 3 Hyd No. 4
Site Pre Combined
Hyd. No. 6 -- 1 Year

'
Hydrograph
Report 13

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. IVo. 7
' Site Post Development
Hydrograph type = SCS Runoff Peak discharge = 118.10 cfs
' Storm frequency = 1 yrs Time to peak = 719 min
Time interval = 1 min Hyd. volume = 276,769 cult
Drainage area = 36.890 ac Curve number = 92
' Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method =USER Time of conc. (Tc) = 10.00 min
Total precip. = 2.90 in Distribution = Type II
' Storm duration = 24 hrs Shape factor = 484

' Site Post Development
Q (cfs)
Hyd. No. 7 -- 1 Year
Q (cfs)
120 0
' 0
' 100.00
80.00
' 60.00
' 40.00
' 20.00
t
0.00
120.00
100.00
80.00
60.00
40.00
20.00
' 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440
Time (min)
Hyd No. 7
1

H d ro ra h
Y g p Re o rt
p

' Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 8
' BMP Pond Routed
Hydrograph type =Reservoir
' Storm frequency = 1 yrs
Time interval = 1 min
Inflow hyd. No. = 7 -Site Post Development
' Reservoir name =DEB SWM BMP WQ Orifice

Storage Indication method used.

1
' Q (cfs)
' 120.00
' 100.00
' 80.00
1
' 60.00
' 40.00
' 20.00
1
' 0.00
0
14
Tuesday, Jan 22, 2008
Peak discharge = 1.737 cfs
Time to peak = 1105 min
Hyd. volume = 196,809 cult
Max. Elevation = 662.13 ft
Max. Storage = 207,240 cult
BMP Pond Routed
Hyd. No. 8 -- 1 Year
300 600 900 1200
Hyd No. 8 Hyd No. 7
1500 1800 2100 2400 2700
~' Total storage used = 207,240 cuft
Q (cfs)
120.00
100.00
80.00
60.00
40.00
20.00
0.00
3000
Time (min)

Pond Report 15
Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Pond No. 1 -DEB SWM BMP WQ Orifice
Pond Data
Contours -User-defined contour areas. Average end area method used for volume calculation. Begining Elevation = 658.50 ft
Stage /Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (tuft) Total storage (cult)
0.00 658.50 48,973 0 0
0.50 659.00 53,572 25,636 25,636
1.50 660.00 56,408 54,990 80,626
2.50 661.00 59,300 57,854 138,480
3.50 662.00 62,248 60,774 199,254
4.50 663.00 65,253 63,751 263,005
5.50 664.00 68,315 66,784 329,789
6.50 665.00 71,433 69,874 399,663
7.50 666.00 74,607 73,020 472,683
Culvert /Orifice Structu res Weir Structures
[A] [B] [C] [PrFRsr] [A] [B] [C] [D]
Rise (in) = 48.00 6.00 0.00 0.00 Crest Len (ft) = 24.00 0.00 30.00 0.00
Span (in) = 48.00 6.00 0.00 0.00 Crest EI. (ft) = 664.30 0.00 664.60 0.00
No. Barrels = 1 1 1 0 Weir Coeff. = 3.33 3.33 3.33 3.33
Invert EI. (ft) = 654.00 658.50 0.00 0.00 Weir Type =Riser Rect Ciplti ---
Length (ft) = 50.00 0.00 0.00 0.00 Multi-Stage =Yes Yes No No
Slope (%) = 1.00 0.00 0.00 n/a
N-Value = .013 .013 .013 n/a
Orifice Coeff. = 0.60 0.60 0.60 0.60 Exfil.(in/hr) = 0.000 (by Contour)
Multi-Stage = n/a Yes No No TW Elev. (ft) = 0.00
Note: CulverUOrifice outflows are analyzed under inlet (ic) and outlet (oc) control. Weir risers checked for orifice conditions (ic) and submergence (s).
Stage / Storage / Discharge Table
Stage Storage Elevation Clv A Clv B Clv C PrfRsr Wr A Wr B Wr C Wr D Exfil User Total
ft cult ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs
0.00 0 658.50 0.00 0.00 --- --- 0.00 --- 0.00 --- --- --- 0.00
0.05 2,564 658.55 76.33 oc 0.01 is --- --- 0.00 --- 0.00 --- --- --- 0.01
0.10 5,127 658.60 76.33 oc 0.03 is --- --- 0.00 --- 0.00 --- --- --- 0.03
0.15 7,691 658.65 76.33 oc 0.07 is -- --- 0.00 --- 0.00 --- --- --- 0.07
0.20 10,255 658.70 76.33 oc 0.11 is --- --- 0.00 --- 0.00 --- --- --- 0.11
0.25 12,818 658.75 76.33 oc 0.17 is --- --- 0.00 --- 0.00 --- --- --- 0.17
0.30 15,382 658.80 76.33 oc 0.23 is --- --- 0.00 --- 0.00 --- --- --- 0.23
0.35 17,945 658.85 76.33 oc 0.30 is --- --- 0.00 --- 0.00 --- --- --- 0.30
0.40 20,509 658.90 76.33 oc 0.36 is --- --- 0.00 --- 0.00 --- --- --- 0.36
0.45 23,073 658.95 76.33 oc 0.43 is --- --- 0.00 --- 0.00 --- --- --- 0.43
0.50 25,636 659.00 76.33 oc 0.47 is --- --- 0.00 --- 0.00 --- --- --- 0.47
0.60 31,135 659.10 76.33 oc 0.56 is --- --- 0.00 --- 0.00 --- --- --- 0.56
0.70 36,634 659.20 76.33 oc 0.63 is --- --- 0.00 --- 0.00 --- --- --- 0.63
0.80 42,133 659.30 76.33 oc 0.70 is --- --- 0.00 --- 0.00 --- --- --- 0.70
0.90 47,632 659.40 76.33 oc 0.76 is --- --- 0.00 --- 0.00 --- --- --- 0.76
1.00 53,131 659.50 76.33 oc 0.82 is --- --- 0.00 --- 0.00 --- --- --- 0.82
1.10 58,630 659.60 76.33 oc 0.87 is --- --- 0.00 --- 0.00 --- --- --- 0.87
1.20 64,129 659.70 76.33 oc 0.92 is --- --- 0.00 --- 0.00 --- --- --- 0.92
1.30 69,628 659.80 76.33 oc 0.97 is --- --- 0.00 --- 0.00 --- --- --- O.g7
1.40 75,127 659.90 76.33 oc 1.01 is --- --- 0.00 --- 0.00 --- --- --- 1.01
1.50 80,626 660.00 76.33 oc 1.06 is --- --- 0.00 --- 0.00 --- --- --- 1.06
1.60 86,412 660.10 76.33 oc 1.10 is --- --- 0.00 --- 0.00 --- --- --- 1.10
1.70 92,197 660.20 76.33 oc 1.14 is --- --- 0.00 --- 0.00 --- --- --- 1.14
1.80 97,982 660.30 76.33 oc 1.18 is --- --- 0.00 --- 0.00 --- --- --- 1.18
1.90 103,768 660.40 76.33 oc 1.21 is --- --- 0.00 --- 0.00 --- --- --- 1.21
2.00 109,553 660.50 76.33 oc 1.25 is --- --- 0.00 --- 0.00 --- --- --- 1.25
2.10 115,339 660.60 76.33 oc 1.29 is --- --- 0.00 --- 0.00 --- --- --- 1.2g
2.20 121,124 660.70 76.33 oc 1.32 is --- --- 0.00 --- 0.00 --- --- -- 1.32
2.30 126,909 660.80 76.33 oc 1.35 is --- --- 0.00 --- 0.00 --- --- --- 1.35
2.40 132,695 660.90 76.33 oc 1.39 is --- --- 0.00 --- 0.00 --- --- --- 1.39
2.50 138,480 661.00 76.33 oc 1.42 is -- --- 0.00 --- 0.00 --- --- --- 1.42
2.60 144,558 661.10 76.33 oc 1.45 is --- --- 0.00 --- 0.00 --- --- --- 1.45
Continues on next page..

16
DEB SWM BMP WO Orifice
Stage /Storage / Discharge Table
Stage Storage Elevation Clv A Clv B Clv C PrfRsr Wr A Wr B Wr C Wr D Exfil User Total
ft cult ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs
2.70 150,635 661.20 76.33 oc 1.48 is --- --- 0.00 --- 0.00 --- --- --- 1
48
' 2.80 156,713 661.30 76.33 oc 1.51 is --- --- 0.00 --- 0.00 --- --- --- .
1
51
2.90 162,790 661.40 76.33 oc 1.54 is --- --- 0.00 --- 0.00 --- --- --- .
1
54
3.00 168,867 661.50 76.33 oc 1.57 is --- --- 0.00 --- 0.00 --- --- --- .
1
57
3.10

3.20 174,945

181,022 661.60

661.70 76.33 oc

76.33 oc 1.60 is

1.62 is --- ---

--- --- 0.00

0.00 ---

--- 0.00

0
00 --- ---
---
--- --- --- .
1.60
1
62
3.30 187,100 661.80 76.33 oc 1.65 is --- --- 0.00 --- .
0.00 --- --- --- .
1
65
3.40 193,177 661.90 76.33 oc 1.68 is --- --- 0.00 --- 0.00 --- --- --- .
1
68
3.50 199,254 662.00 76.33 oc 1.70 is --- --- 0.00 --- 0.00 --- --- --- .
1
70
3.60 205,629 662.10 76.33 oc 1.73 is 0.00 0.00 .
1
73
' 3.70 212,004 662.20 76.33 oc 1.76 is ___ ___ 0.00 ___ 0.00 ___ ___ ___ .
1
76
3.80 218,379 662.30 76.33 oc 1.78 is --- --- 0.00 --- 0.00 --- --- --- .
1
78
3.90 224,754 662.40 76.33 oc 1.81 is --- --- 0.00 --- 0.00 --- --- --- .
1
81

' 4.00
4.10 231,130
237,505 662.50
662.60 76.33 oc
76.33 oc 1.83 is
1.85 is --- ---
--- - - 0.00
0.00 ---
--- 0.00
0.00 --- --- ---
--- --- -- .
1.83
1
85
4.20 243,880 662.70 76.33 oc 1.88 is --- --- 0.00 --- 0.00 _
--- --- __ .
1
88
4.30 250,255 662.80 76.33 oc 1.90 is --- --- 0.00 --- 0.00 --- --- --- .
1
90
4.40 256,630 662.90 76.33 oc 1.93 is --- --- 0.00 --- 0.00 --- --- --- .
1
93
4.50 263,005 663.00 76.33 oc 1.95 is 0.00 0.00 - .
1
95
' 4.60 269,683 663.10 76.33 oc 1.97 is =__ ___ 0.00 ___ 0.00 ___ ___ _
_ .
1
97
4.70 276,362 663.20 76.33 oc 1.99 is --- 0.00 --- 0.00 --- --- --- ,
1
99
4.80 283,040 663.30 76.33 oc 2.02 is --- --- 0.00 --- 0.00 --- --- --- .
2
02
4.90

5.00 289,718

296,397 663.40

663.50 76.33 oc

76.33 oc 2.04 is

2.06 is --- ---

--- -- 0.00

0.00 ---

--- 0.00

0.00 --- ---
---
--- --- --- ,
2.04
2
06
5.10 303,075 663.60 76.33 oc 2.08 is --- --- 0.00 --- 0.00 --- --- --- .
2
08
5.20 309,754 663.70 76.33 oc 2.10 is --- --- 0.00 --- 0.00 --- --- --- ,
2
10
5.30 316,432 663.80 76.33 oc 2.12 is --- --- 0.00 --- 0.00 -- --- ___ .
2
12
5.40 323,110 663.90 76.33 oc 2.15 is --- --- 0.00 --- 0.00 --- --- -- .
2
15
' 5.50 329,789 664.00 76.33 oc 2.17 is --- --- 0.00 --- 0.00 _
--- --- -- .
2
17
5.60 336,776 664.10 76.33 oc 2.19 is --- --- 0.00 --- 0.00 --- --- --- ,
2
19
5.70 343,764 664.20 76.33 oc 2.21 is --- --- 0.00 --- 0.00 --- --- ___ .
2
21

' 5.80
5.90 350,751
357,738 664.30
664.40 76.33 oc
76.33 oc 2.23 is
2.25 is --- ---
-- 0.00
2.52 --- 0.00
0.00
_-
-
_ .
2.23
4
77
6.00 364,726 664.50 76.33 oc 2.27 is =__
_ 7.14 ___ 0.00 _
_
_ _ ,
9
41
6.10 371,713 664.60 76.33 oc 2.29 is --- --- 13.12 --- 0.00 --- --- --- .
15
41
6.20 378,701 664.70 76.33 oc 2.31 is --- --- 20.21 --- 3.15 --- --- --- .
25
66
6.30 385,688 664.80 76.33 oc 2.33 is --- -- 28.24 8.92 - .
39
49
' 6.40 392,675 664.90 76.33 oc 2.34 is = 37.12 __ 16.40 ___ ___
__ .
55
87
6.50 399,663 665.00 76.33 oc 2.36 is --- 46.81 --- 25.28 --- --- --- .
74
45
6.60 406,965 665.10 76.33 oc 2.38 is -- --- 57.18 --- 35.32 --- --- --- .
94
89

' 6.70
6.80 414,267
421,569 665.20
665.30 76.33 oc
82.34 oc 2.40 is
2.42 is --- --- 68.23
79.91 --- 46.43
58.50
_
-
- ,
117.06
140
83
6.90 428,871 665.40 94.58 oc 2.38 is ___ __= 92.19 ___ 71.47 ___
_
__ .
166
05
7.00 436,173 665.50 107.36 oc 2.32 is --- --- 105.04 --- 85.28 --- --- --- .
192
65
7.10 443,475 665.60 120.68 oc 2.24 is --- --- 118.44 --- 99.88 --- --- --- .
220
56
7.20 450,777 665.70 134.43 is 2.06 is _-
- 132.37 115.23 .
249
66
7.30 458,079 665.80 148.63 is 1.83 is =
__ 146.80 ___ 131.29 ___ ___ ___ .
27g
g2
7.40 465,381 665.90 163.25 is 1.53 is 161.72 --- 148.04 --- --- --- .
311
29
7.50 472,683 666.00 176.10 is 1.17 is --- --- 174.93 s --- 165.49 --- --- --- .
341.58
' ...End

1

' H d ro ra h
Y 9 p Re o rt
p ~'

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 9
' Total Post to Point A
Hydrograph type =Combine Peak discharge = 320.37 cfs
' Storm frequency = 1 yrs Time to peak = 747 min
Time interval = 1 min Hyd. volume = 2,406,437 cult
Inflow hyds. = 1, 2, 8 Contrib. drain. area= 489.340 ac

' Total Post to Point A
Q (cfs) Hyd. No. 9 -- 1 Year Q (cfs)

' 350.00
' 300.00
' 250.00
' 200.00
' 150.00
100.00
50.00
0.00
350.00
300.00
250.00
200.00
150.00
100.00
50.00
0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 9 Hyd No. 1 Hyd No. 2 Hyd No. 8 Time (min)

0

1
1
1

1

1
1

18
Hydrograph Summary Report
Hydraflow Hydrographs by Intelisolve v9.1
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
interval
(min) Time to
peak
(min) Hyd.
volume
(cult) Inflow
hyd(s) Maximum
elevation
(ft) Total
strge used
(cult) Hydrograph
description
1 SCS Runoff 415.52 1 749 2,661,382 ---- ------ ------ Offsite DA 1
2 SCS Runoff 104.34 1 728 379,888 ---- ------ ------ Offsite DA 2
3 SCS Runoff 13.21 1 726 52,401 ---- ------ ------ Site PreDevelopment-DA 1
4 SCS Runoff 6.250 1 722 19,752 ---- ------ ------ Site PreDevelopment-DA 2
5 Combine 454.13 1 747 3,113,423 1, 2, 3, 4 ------ ------ Total Pre Development Point A
6 Combine 18.91 1 724 72,152 3, 4, ------ ------ Site Pre Combined
7 SCS Runoff 148.63 1 719 353,088 ---- ------ ------ Site Post Development
8 Reservoir 1.974 1 1137 231,446 7 663.11 270,294 BMP Pond Routed
9 Combine 450.94 1 747 3,272,717 1, 2, 8 ------ ------ Total Post to Point A
Detention 01-22-08.gpw Return Period: 2 Year Tuesday, Jan 22, 2008

' 19
Hydrograph Report

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 1
Offsite DA 1
Hydrograph type = SCS Runoff Peak discharge = 415.52 cfs
' Storm frequency = 2 yrs Time to peak = 749 min
Time interval = 1 min Hyd. volume = 2,661,382 cult
Drainage area = 449.650 ac Curve number = 80
t Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 58.60 min
Total precip. = 3.50 in Distribution = Type II
' Storm duration = 24 hrs Shape factor = 484

' Offsite DA 1
Q (cfs) Hyd. No. 1 -- 2 Year Q (cfs)
' 420.00
' 360.00
300.00
240.00
180.00
120.00
60.00
1
0.00
420.00
360.00
300.00
240.00
180.00
120.00
60.00
' 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 1

' 20
Hydrograph Report

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 2
' Offsite DA 2
Hydrograph type = SCS Runoff Peak discharge = 104.34 cfs
Storm frequency = 2 yrs Time to peak = 728 min
' Time interval = 1 min Hyd. volume = 379
888 cult
Drainage area = 39.690 ac Curve number ,
= 92
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 25.30 min
Total precip. = 3.50 in Distribution =Type II
' Storm duration = 24 hrs Shape factor = 484

' Offsite DA 2
Q (cfs)
Hyd. No. 2 -- 2 Year Q (cfs)
' 120.00
' 100.00
' 80.00
t 60.00
' 40.00
t 20.00
t
0.00
120.00
100.00
80.00
60.00
40.00
20.00
' 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 2 Time (min)

21
Hydrograph Report

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 3
Site PreDevelopment-DA 1
Hydrograph type = SCS Runoff Peak discharge = 13.21 cfs
' Storm frequency = 2 yrs Time to peak = 726 min
Time interval = 1 min Hyd. volume = 52,401 cult
Drainage area = 26.830 ac Curve number = 60
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 15.50 min
Total precip. = 3.50 in Distribution = Type II
' Storm duration = 24 hrs Shape factor = 484

' Site PreDevelopment-DA 1
Q (cfs) Hyd. No. 3 -- 2 Year Q (cfs)
' 14.00 14.00
__ t
' 12.00 12.00
~ , ~ I,
i _ i__ _ ~
10.00 10.00
~ '
8.00 i 8.00
' i
6.00 ~
~ 6.00
I, I I
~ I I I
4.00 i ~ 4.00
_ ~i i __
__ __ I I - _ _ __
2.00 , ~ ~ ~ 2.00
~ ~
~ ~ ~ ~
0.00 ~ ~ ~ ~ ' 0.00
0 120 240 360 480 600 720 840 960 1080 120 1
0 320 1440 1560
Hyd No. 3 Time (min)

Hydrograph Report
22
' Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 4
' Site PreDevelopment-DA 2
Hydrograph type SCS Runoff
' Storm frequency = 2 yrs
Time interval = 1 min
Drainage area = 10.060 ac
Basin Slope = 0.0
Tc method = TR55
Total precip. = 3.50 in
' Storm duration = 24 hrs
Tuesday, Jan 22, 2008
Peak discharge = 6.250 cfs
Time to peak = 722 min
Hyd. volume = 19,752 cult
Curve number = 60
Hydraulic length = 0 ft
Time of conc. (Tc) = 10.90 min
Distribution = Type II
Shape factor = 484
' Q (cfs)
' 7.00
' 6.00
' 5.00
' 4
00
.

3.00

2.00

1.00

0.00
Site PreDevelopment-DA 2
Hyd. No. 4 -- 2 Year
Q (cfs)
7.00
6.00
5.00
4.00
3.00
2.00
1.00

' 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 4 Time (min)

' H d ro ra h
Y g p Re o rt
p
' Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 5
' Total Pre Development Point A
Hydrograph type =Combine
Storm frequency = 2 yrs
' Time interval = 1 min
Inflow hyds. = 1, 2, 3, 4
' Q (cfs)
' 480.00
420.00
' 360.00
I
' 300.00 s
240.00
' 180.00 -~
120.00
60.00
0.00 ~-
0
1
23
Tuesday, Jan 22, 2008
Peak discharge = 454.13 cfs
Time to peak = 747 min
Hyd. volume = 3,113,423 cult
Contrib. drain. area= 526.230 ac
Total Pre Development Point A
Hyd. No. 5 -- 2 Year
Q (cfs)
480.00
420.00
360.00
300.00
240.00
180.00
120.00
60.00
n nn
120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560v vv
Time (min)
Hyd No. 5 Hyd No. 1 Hyd No. 2 Hyd No. 3
Hyd No. 4

24
Hydrograph Report
' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 6
' Site Pre Combined
Hydrograph type =Combine Peak discharge = 18.91 cfs
Storm frequency = 2 yrs Time to peak = 724 min
' Time interval = 1 min Hyd. volume = 72,152 cult
Inflow hyds. = 3, 4 Contrib. drain. area= 36.890 ac

' Site Pre Combined
Q (cfs)
Hyd. No. 6 -- 2 Year Q (cfs)

' 21.00
' 18.00
' 15.00
' 12
00
.

9.00

6.00

3.00

0 00
21.00
18.00
15.00
12.00
9.00
6.00
3.00
. 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 6 Hyd No. 3 Hyd No. 4

' Hydrograph Report
25
' Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 7
' Site Post Development
Hydrograph type = SCS Runoff
Storm frequency = 2 yrs
Time interval = 1 min
Drainage area = 36.890 ac
Basin Slope = 0.0
Tc method =USER
Total precip. = 3.50 in
' Storm duration = 24 hrs
Tuesday, Jan 22, 2008
Peak discharge = 148.63 cfs
Time to peak = 719 min
Hyd. volume = 353,088 cult
Curve number = 92
Hydraulic length = 0 ft
Time of conc. (Tc) = 10.00 min
Distribution = Type II
Shape factor = 484
' Site Post Development
Q (cfs) Hyd. No. 7 -- 2 Year
' 160.00
140.00
i -
120.00
100.00 ~ __
80.00 ~
60.00
40.00 ~
i
__
20.00 __
0 00 ; ;~ ~ ~ , _:
Q (cfs)
160.00
140.00
120.00
100.00
80.00
60.00
40.00
20.00

' ~ 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440
Hyd No. 7 Time (min)

' Hydrograph Report
26
Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 8
' BMP Pond Routed
Hydrograph type = Reservoir
' Storm frequency = 2 yrs
Time interval = 1 min
Inflow hyd. No. = 7 -Site Post Development
' Reservoir name = DEB SWM BMP WQ Orifice
Tuesday, Jan 22, 2008
Peak discharge = 1.974 cfs
Time to peak = 1137 min
Hyd. volume = 231,446 cult
Max. Elevation = 663.11 ft
Max. Storage = 270,294 cult
Storage Indication method used.
' BMP Pond Routed
Q (cfs) Hyd. No. 8 -- 2 Year
' 160.00
' 140.00
' 120.00
' 100.00
80.00
' 60.00
' 40.00
' 20.00
0.00
0 300 600 900 1200 1500 1800 2100 2400 2700
Hyd No. 8 Hyd No. 7 ~__._.....k_+._.i.-( Total storage used = 270,294 cuft
Q (cfs)
160.00
140.00
120.00
100.00
80.00
60.00
40.00
20.00
--L 0.00
3000
Time (min)

Hydrograph Report
27
' Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 9
' Total Post to Point A
Hydrograph type = Combine
Storm frequency = 2 yrs
Time interval = 1 min
Inflow hyds. = 1, 2, 8

Tuesday, Jan 22, 2008
Peak discharge = 450.94 cfs
Time to peak = 747 min
Hyd. volume = 3,272,717 cult
Contrib. drain. area= 489.340 ac
^
' Q (cfs)
' 480.00
420.00
360.00
300.00
L
240.00
180.00
L ~
120.00
_i
60.00
0.00 ~ _ ~ ~ _ I
Total Post to Point A
Hyd. No. 9 -- 2 Year

Q (cfs)
480.00
420.00
360.00
300.00
240.00
180.00
120.00
60.00
0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 9 Hyd No. 1 Hyd No. 2 Hyd No. 8

i~

28
Hydrograph Summary Report HydraflowHydrographsbylntelisolvev9.1
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
interval
(min) Time to
peak
(min) Hyd.
volume
(tuft) Inflow
hyd(s) Maximum
elevation
(ft) Total
strge used
(tuft) Hydrograph
description
1 SCS Runoff 769.63 1 749 4,847,135 ---- ------ ------ Offsite DA 1
2 SCS Runoff 162.08 1 727 603,239 ---- ------ ------ Offsite DA 2
3 SCS Runoff 43.30 1 724 134,095 ---- ------ ------ Site PreDevelopment-DA 1
4 SCS Runoff 19.76 1 721 50,546 ---- ------ ------ Site PreDevelopment-DA 2
5 Combine 834.53 1 747 5,635,012 1, 2, 3, 4 ------ ------ Total Pre Development Point A
6 Combine 61.43 1 723 184,641 3, 4, ------ ------ Site Pre Combined
7 SCS Runoff 229.34 1 719 560,683 ---- ------ ------ Site Post Development
8 Reservoir 12.47 1 779 377,065 7 664.55 368,288 BMP Pond Routed
9 Combine 827.46 1 747 5,827,438 1, 2, 8 ------ ------ Total Post to Point A
Detention 01-22-08.gpw Return Period: 10 Year Tuesday, Jan 22, 2008

' 29
Hydrograph Report

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 1
' Offsite DA 1
Hydrograph type = SCS Runoff Peak discharge = 769.63 cfs
' Storm frequency = 10 yrs Time to peak = 749 min
Time interval = 1 min Hyd. volume = 4,847,135 cult
Drainage area = 449.650 ac Curve number = 80
' Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 58.60 min
Total precip. = 5.10 in Distribution = Type II
' Storm duration = 24 hrs Shape factor = 484

' Offsite DA 1
Q (cfs)
Hyd. No. 1 -- 10 Year Q (cfs
)
770.00
' 660.00
' 550.00
' 440.00
' 330.00
220.00
110.00
0.00
770.00
660.00
550.00
440.00
330.00
220.00
110.00
' 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 1

H d ro ra h
Y g p Re o rt
p

Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 2
' Offsite DA 2
Hydrograph type = SCS Runoff
Storm frequency = 10 yrs
Time interval = 1 min
Drainage area = 39.690 ac
Basin Slope = 0.0
' Tc method = TR55
Total precip. = 5.10 in
Storm duration = 24 hrs
Q (cfs)
180.00 -
160.00 -
1
140.00 -~
120.00
' 100.00
80.00
60.00 ~
' 40.00
i
20.00
0.00 I
0
Offsite DA 2
Hyd. No. 2 -- 10 Year
Tuesday, Jan 22, 2008
Peak discharge = 162.08 cfs
Time to peak = 727 min
Hyd. volume = 603,239 cult
Curve number = 92
Hydraulic length = 0 ft
Time of conc. (Tc) = 25.30 min
Distribution = Type II
Shape factor = 484
30
Q (cfs)
180.00
160.00
140.00
120.00
100.00
80.00
60.00
40.00
20.00
n nn
120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560V Vv
Time (min)
Hyd No. 2

' 31
Hydrograph Report

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 3
' Site PreDevelopment-DA 1
Hydrograph type = SCS Runoff Peak discharge = 43.30 cfs
' Storm frequency = 10 yrs Time to peak = 724 min
Time interval = 1 min Hyd. volume = 134,095 cult
Drainage area = 26.830 ac Curve number = 60
' Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 15.50 min
Total precip. = 5.10 in Distribution = Type II
' Storm duration = 24 hrs Shape factor = 484

' Site PreDevelopment-DA 1
Q (cfs) Hyd. No. 3 -- 10 Year Q (cfs)
' 50.00
40.00
' 30.00
20.00
10.00
0.00
50.00
40.00
30.00
20.00
10.00
' 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 3
1

Hydrograph Report
' Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 4
' Site PreDevelopment-DA 2
Hydrograph type = SCS Runoff
Storm frequency = 10 yrs
' Time interval = 1 min
Drainage area = 10.060 ac
Basin Slope = 0.0
' Tc method = TR55
Total precip. = 5.10 in
Storm duration = 24 hrs
1
' Q (cfs)
' 21.00
18.00
15.00
' 12.00 -
9.00 -
6.00 -
3.00 -
0.00 -
Tuesday, Jan 22, 2008
Peak discharge = 19.76 cfs
Time to peak = 721 min
Hyd. volume = 50,546 cult
Curve number = 60
Hydraulic length = 0 ft
Time of conc. (Tc) = 10.90 min
Distribution = Type II
Shape factor = 484
Site PreDevelopment-DA 2
Hyd. No. 4 -- 10 Year
32
Q (cfs)
21.00
18.00
15.00
12.00
9.00
6.00
3.00
n nn
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560v vv
Hyd No. 4 Time (min)

'
Hydrograph
Report 33

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 5
Total Pre Development Point A
Hydrograph type =Combine Peak discharge = 834.53 cfs
' Storm frequency = 10 yrs Time to peak = 747 min
Time interval = 1 min Hyd. volume = 5,635,012 cult
Inflow hyds. = 1, 2, 3, 4 Contrib. drain. area= 526.230 ac

' Total Pre Development Point A
Q (cfs) Hyd. No. 5 -- 10 Year Q (cfs)
' 840.00
' 720.00
' 600.00
' 480.00
360.00
' 240.00
120.00
1
0.00
840.00
720.00
600.00
480.00
360.00
240.00
120.00
' 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 5 Hyd No. 1 Hyd No. 2 Hyd No. 3
' Hyd No. 4

Hydrograph Report

' Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 6
' Site Pre Combined
Hydrograph type =Combine
Storm frequency = 10 yrs.
' Time interval
Inflow hyds. = 1 min
= 3, 4
' Q (cfs)
70.00
' 60.00
50.00
40.00
30.00
' 20.00
10.00 -F
0.00 -~
' 0
1
Site Pre Combined
Hyd. No. 6 -- 10 Year
Tuesday, Jan 22, 2008
Peak discharge = 61.43 cfs
Time to peak = 723 min
Hyd. volume = 184,641 cult
Contrib. drain. area= 36.890 ac
34
Q (cfs)
70.00
60.00
50.00
40.00
30.00
20.00
10.00
n nn
120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 vv
Hyd No. 6 Hyd No. 3 Hyd No. 4 Time (min)

Hydrograph Report
Site Post Development
Hyd. No. 7 -- 10 Year
' Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 7
' Site Post Development
Hydrograph type = SCS Runoff
Storm frequency = 10 yrs
' Time interval = 1 min
Drainage area = 36.890 ac
Basin Slope = 0.0
' Tc method =USER
Total precip. = 5.10 in
' Storm duration = 24 hrs

' Q (cfs)

' 240.00
' 210.00
' 180.00
150.00
120.00
' 90.00
60.00
30.00
0.00
Tuesday, Jan 22, 2008
Peak discharge = 229.34 cfs
Time to peak = 719 min
Hyd. volume = 560,683 cult
Curve number = 92
Hydraulic length = 0 ft
Time of conc. (Tc) = 10.00 min
Distribution = Type II
Shape factor = 484
35
Q (cfs)
240.00
210.00
180.00
150.00
120.00
~ _ _I _ ~
_~ ~ _ ;:
90.00
60.00
30.00

' 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320
Time (min)
Hyd No. 7

Hydrograph Report
36
' Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 8
' BMP Pond Routed
Hydrograph type = Reservoir
Storm frequency 10 yrs
' Time interval = 1 min
Inflow hyd. No. = 7 -Site Post Development
' Reservoir name = DEB SWM BMP WQ Orifice
Tuesday, Jan 22, 2008
Peak discharge = 12.47 cfs
Time to peak = 779 min
Hyd. volume = 377,065 cult
Max. Elevation = 664.55 ft
Max. Storage = 368,288 cult
Storage Indication method used.
' BMP Pond Routed
Q (cfs) Hyd. No. 8 -- 10 Year
' 240.00
210.00
180.00
' 150.00
120.00
' 90.00
' 60.00
30.00
o.oo
i_
~ ~
~_ i ~ ~
Q (cfs)
240.00
210.00
180.00
150.00
120.00
90.00
60.00
30.00

' o.oo
0 300 600 900 1200 1500 1800 2100 2400 2700 3000
Time (min)
Hyd No. 8 Hyd No. 7 i' Total storage used = 368,288 cult

Hydrograph Report 37

' Hydraflow Hydrographs by Intelisolve vg.1 Tuesday, Jan 22, 2008
Hyd. No. 9
' Total Post to Point A
Hydrograph type =Combine Peak discharge = 827.46 cfs
Storm frequency = 10 yrs Time to peak = 747 min
' Time interval = 1 min Hyd. volume = 5,827,438 cult
Inflow hyds. = 1, 2, 8 Contrib. drain. area= 489.340 ac

Total Post to Point A
' Q (cfs) Hyd. No. 9 -- 10 Year Q (cfs)
' 833.00
' 714.00
595.00
' 476.00
357.00
' 238.00
119.00
0.00
833.00
714.00
595.00
476.00
357.00
238.00
119.00
0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 9 Hyd No. 1 Hyd No. 2 Hyd No. 8 Time (min)

Hydrograph Summary Report

1

1
1

ii

1
1

38
Hydraflow Hydrographs by Intelisolve v9.1
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
interval
(min) Time to
peak
(min) Hyd.
volume
(tuft) Inflow
hyd(s) Maximum
elevation
(ft) Total
strge used
(tuft) Hydrograph
description
1 SCS Runoff 1093.68 1 748 6,888,291 ---- ------ ------ Offsite DA 1
2 SCS Runoff 212.19 1 727 801,286 ---- ------ ------ Offsite DA 2
3 SCS Runoff 75.59 1 724 222,452 ---- ------ ------ Site PreDevelopment-DA 1
4 SCS Runoff 34.09 1 721 83,850 ---- ------ ------ Site PreDevelopment-DA 2
5 Combine 1183.11 1 746 7,995,878 1, 2, 3, 4 ------ ------ Total Pre Development Point A
6 Combine 106.97 1 723 306,302 3, 4, ------ ------ Site Pre Combined
7 SCS Runoff 299.19 1 719 744,759 ---- ------ ------ Site Post Development
8 Reservoir 102.98 1 728 559,824 7 665.14 409,631 BMP Pond Routed
9 Combine 1204.54 1 746 8,249,396 1, 2, 8 ------ ------ Total Post to Point A
Detention 01-22-08.gpw Return Period: 50 Year Tuesday, Jan 22, 2008

Hydrograph Report 3s

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 1
Offsite DA 1
Hydrograph type = SCS Runoff Peak discharge = 1093.68 cfs
' Storm frequency = 50 yrs Time to peak = 748 min
Time interval = 1 min Hyd. volume = 6,888,291 cult
Drainage area = 449.650 ac Curve number = 80
' Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 58.60 min
Total precip. = 6.50 in Distribution = Type II
' Storm duration = 24 hrs Shape factor = 484

Offsite DA 1
' Q (cfs) Hyd. No. 1 -- 50 Year Q (cfs)
1099
' .00
' 942.00
' 785.00
' 628.00
471.00
314.00
157.00
0.00
1099.00
942.00
785.00
628.00
471.00
314.00
157.00
' 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 1 Time (min)

Hydrograph Report 40

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 2
' Offsite DA 2
Hydrograph type = SCS Runoff Peak discharge = 212.19 cfs
Storm frequency = 50 yrs Time to peak = 727 min
Time interval = 1 min Hyd. volume = 801,286 cult
Drainage area = 39.690 ac Curve number = 92
' Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 25.30 min
Total precip. = 6.50 in Distribution = Type II
' Storm duration = 24 hrs Shape factor = 484

Offsite DA 2
Q (cfs)
Hyd. No. 2 -- 50 Year Q cfs
( )

' 240.00
210.00
180.00
150.00
120.00
90.00
1
60.00
30.00
0.00
240.00
210.00
180.00
150.00
120.00
90.00
60.00
30.00
' 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 2 Time (min)

Hydrograph Report 41

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 3
' Site PreDevelopme nt-DA 1
Hydrograph type = SCS Runoff Peak discharge = 75.59 cfs
' Storm frequency = 50 yrs Time to peak = 724 min
Time interval = 1 min Hyd. volume = 222,452 cult
Drainage area = 26.830 ac Curve number = 60
' Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 15.50 min
Total precip. = 6.50 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484

' Site PreDevelopment-DA 1
Q (cfs)
Hyd. No. 3 -- 50 Year
Q (cfs)
80
' .00
80.00
70.00
' 70.00
I
60.00 60.00
1
50.00 L I _ I '
' ~ _ 50.00
40.00 40.00
I_ I
30.00 ~ ~ i
~ 30.00
20.00
- 20.00
1
10.00 ,
' 10.00
~ ,
~~ ~ ~ ~
0.00 0.00
' 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 3 Time (min)

Hydrograph Report 42

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 4
' Site PreDevelopment-DA 2
Hydrograph type = SCS Runoff Peak discharge = 34.09 cfs
Storm frequency = 50 yrs Time to peak = 721 min
Time interval = 1 min Hyd. volume = 83,850 cult
Drainage area = 10.060 ac Curve number = 60
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 10.90 min
Total precip. = 6.50 in Distribution = Type II
' Storm duration = 24 hrs Shape factor = 484

' Site PreDevelopment-DA 2
Q (cfs) Hyd. No. 4 -- 50 Year Q (cfs)
' 35.00
30.00
25.00
' 20.00
15.00
' 10.00
5.00
0.00
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 4 Time (min)

' Hydrograph Report 43

' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 5
' Total Pre Development Point A
Hydrograph type =Combine Peak discharge = 1183.11 cfs
Storm frequency = 50 yrs Time to peak = 746 min
Time interval = 1 min Hyd. volume = 7,995,878 cult
Inflow hyds. = 1, 2, 3, 4 Contrib. drain. area= 526.230 ac

1
' Total Pre Development Point A
C1 (cfs) Hyd. No. 5 -- 50 Year C1(cfs)
11
90.00
1 1020.00
' 850.00
' 680.00
510.00
' 340.00
170.00
0.00
1190.OC
1020.00
850.00
680.00
510.00
340.00
170.00
0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 5 Hyd No. 1 Hyd No. 2 Hyd No. 3 Time (min)
' Hyd No. 4

Hydrograph Report

' Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 6
' Site Pre Combined
Hydrograph type =Combine
Storm frequency = 50 yrs
1 Time interval = 1 min
Inflow hyds. = 3, 4
' Q (cfs)
120.00
1 100.00
' 80.00
60.00
' 40.00 -
' 20.00 -
0.00 -
I
Site Pre Combined
Hyd. No. 6 -- 50 Year
Tuesday, Jan 22, 2008
Peak discharge = 106.97 cfs
Time to peak = 723 min
Hyd. volume = 306,302 cult
Contrib. drain. area= 36.890 ac
44
Q (cfs)
120.00
100.00
80.00
60.00
40.00
20.00
n nn
120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560v vv
Hyd No. 6 Hyd No. 3 Hyd No. 4
Time (min)

Hydrograph Report
45
Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 7
Site Post Development
Hydrograph type = SCS Runoff
Storm frequency = 50 yrs
Time interval = 1 min
Drainage area = 36.890 ac
Basin Slope = 0.0
' Tc method =USER
Total precip. = 6.50 in
' Storm duration = 24 hrs
Tuesday, Jan 22, 2008
Peak discharge = 299.19 cfs
Time to peak = 719 min
Hyd. volume = 744,759 cult
Curve number = 92
Hydraulic length = 0 ft
Time of conc. (Tc) = 10.00 min
Distribution = Type II
Shape factor = 484
Q (cfs)
' 320.00
280.00 ,
i
240.00 '
200.00
160.00
120.00
1 i i ~
80.00
1
40.00 ~ ~
~ + _ __
0 00 ~L
Site Post Development
Hyd. No. 7 -- 50 Year
0 120 240 360
Hyd No. 7
480 600 720 840
Q (cfs)
320.00
280.00
240.00
200.00
160.00
120.00
80.00
40.00
0.00
960 1080 1200 1320
Time (min)

Hydrograph Report
' Hydraflow Hydrographs by Intelisolve v9.1
Hyd. No. 8
' BMP Pond Routed
Hydrograph type = Reservoir
Storm frequency = 50 yrs
' Time interval = 1 min
Inflow hyd. No. = 7 -Site Post Development
' Reservoir name = DEB SWM BMP WQ Orifice
46
Tuesday, Jan 22, 2008
Peak discharge = 102.98 cfs
Time to peak = 728 min
Hyd. volume = 559,824 cult
Max. Elevation = 665.14 ft
Max. Storage = 409,631 cult
Storage Indication method used.
' BMP Pond Routed
Q (cfs) Hyd. No. 8 -- 50 Year
320.00
280.00
240.00
200.00
160.00
120.00
80.00
40.00
0 00
Q (cfs)
320.00
280.00
240.00
200.00
160.00
120.00
80.00
40.00
0.00
' 0 300 600 900 1200 1500 1800 2100 2400 2700 3000
Time (min)
Hyd No. 8 Hyd No. 7 = ` ~ ~_~_i ~I Total storage used = 409,631 cult

Hydrograph Report 47
' Hydraflow Hydrographs by Intelisolve v9.1 Tuesday, Jan 22, 2008
Hyd. No. 9
' Total Post to Point A
Hydrograph type =Combine Peak discharge = 1204.54 cfs
Storm frequency = 50 yrs Time to peak = 746 min
' Time interval = 1 min Hyd. volume = 8,249,396 cult
Inflow hyds. = 1, 2, 8 Contrib. drain. area= 489.340 ac

Total Post to Point A
' Q (cfs)
Hyd. No. 9 -- 50 Year Q (cfs)
' 1211.00
' 1038.00
' 865.00
' 692.00
1 519.00
' 346.00
173.00
0.00
1211.00
1038.00
865.00
692.00
519.00
346.00
173.00
0.00
' 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 9 Hyd No. 1 Hyd No. 2 Hyd No. 8

t

1

1
1
~ROSIOI~t C.OI~ITROL
CES~-
1

1
1
1
1
1
1
1
1
1
RIP-RAP APRON 1
PROJECT NO. 071021.000 - i7Et3 5wP 'Yo 410 GuT`Er
DATE: 01 /21 /08
30„ /'~
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < D.5 diameter).
050 (CFS) = 82.29
Do (ft) = 4
3Do (ft) = 12
La (ft) = 26
W (ft) = 30
d50 (ft) = 1
d(in) = 18
Discharge (ft3/sec) y JuV 1VVV