HomeMy WebLinkAboutWPO201400092 Calculations WPO VSMP 2016-06-29 FOOTHILL CROSSING II STORMWATER
MANAGEMENT CALCULATIONS PACKET
Date of Calculations
June 5, 2015
Revised September 24, 2015
Revised June 29, 2016
(Minor revisions noted in yellow)
PREPARED BY:
COLLINS
200 GARRETT STREET, SUITE K
CHARLOTTESVILLE, VA 22902
434.293.3719 PH
434.293.2813 FX
www.collins-engineering.com
DEQ Virginia Runoff Reduction Method
Water Quality Calculations
(Revised per updated SCS Worksheet 2)
Virginia Runoff Reduction Method New Development Worksheet -v2.8 -June 2014
To be used w/2011 BMP Standards and Specifications
Site Data
Pro ect Name The Villas at Foothills
Date 6/29/16-Updated per revised SCS Worksheet 2
data input cells
calculation cells
constant values
1. Post-Development Pro ect Land Cover Information
Constants - -
Annual Rainfall(inches) 43
Target Rainfall Event(inches) 1.00
Phosphorus EMC(mg/L) 0.26 Nitrogen EMC(mg/L) 1.86
Target Phosphorus Target Load(Ib/acre/yr) 0.41
Pj 0.90
Land Cover (acres)
A soils B Soils C Soils D Soils Totals
Forest/Open Space(acres)--undisturbed,
protected forest/open space or reforested land 0.00 0.00 0.00 0.00 0.00
Managed Turf(acres)--disturbed,graded for
yards or other turf to be mowed/managed 0.00 9.31 5.96 0.00 15.27
Impervious Cover(acres) 0.00 14.65 5.04 0.00 19.69
Total 34.96
Rv Coefficients
A soils B Soils C Soils D Soils
Forest/Open Space 0.02 0.03 0.04 0.05
Managed Turf 0.15 0.20 0.22 0.25
Impervious Cover 0.95 0.95 0.95 0.95
Land Cover Summary
Forest/Open Space Cover(acres) 0.00
Weighted Rv(forest) 0.00
Forest 0%
Managed Turf Cover(acres) 15.27
Weighted Rv(turf) 0.21
Managed Turf 44%
Impervious Cover(acres) 19.69
Rv(impervious) 0.95
%Impervious 56%
Total Site Area(acres) 34.96
Site Rv 0.63
Post-Development Treatment Volume(acre-ft) 1.82
Post-Development Treatment Volume(cubic
feet) 79,420
Post_Development Load(TP)(Ib/yr) 49.90 Post_Development Load(TN)(Ib/yr)
Total Load(TP)Reduction Required(Ib/yr) 35.57
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Virginia Runoff Reduction Method Worksheet
Virginia Runoff Reduction Method New Development Worksheet-v2.8-June 2014
Site Data Summary
Total Rainfall= 43 inches
Site Land Cover Summary
A Soils B Soils C Soils D Soils Total %of Total
Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00
Turf(acres) 0.00 9.31 5.96 0.00 15.27 43.68
Impervious(acres) 0.00 14.65 5.04 0.00_ 19.69 56.32
34.96 100.00
Site Rv 0.63
Post Development Treatment Volume(ft3) 79420
Post Development TP Load(Ib/yr) 49.90
Post Development TN Load(Ib/yr) _ 356.97
Total TP Load Reduction Required(lb/yr) 35.57
Total Runoff Volume Reduction(ft') 0
Total TP Load Reduction Achieved(Ib/yr) 36
Total TN Load Reduction Achieved(Ib/yr) 138.17
Adjusted Post Development TP Load(Ib/yr) 13.68
Remaining Phosphorous Load Reduction(Lb/yr)Required 0.00
Drainage Area Summary
D.A.A D.A.B D.A.C D.A.D D.A.E Total
Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00
Turf(acres) 5.67 8.15 1.45 0.00 0.00 15.27
Impervious(acres) 10.84 8,45 0.40 0.00 0.00 19.69
34.96
Drainage Area Compliance Summary
D.A.A D.A.B D.A.C D.A.D D.A.E Total
TP Load Red.(Ib/yr) 19.62 16.59 0.00 0.00 0.00 36.21
TN Load Red.(Ib/yr) 74.87 63.30 0.00 0.00 0.00 138.17
Summary Print
Virginia Runoff Reduction Method Worksheet
Drainage Area A Summary
Land Cover Summary
A Soils B Soils C Soils D Soils Total %of Total
Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00
Turf(acres) 0.00 3.03 2.64 0.00 5.67 34.34
Impervious(acres) 0.00 7.62 3.22 0.00 10.84 65.66
16.51
BMP Selections
Practice Credit Area(acres) Downstream
Practice
13.c.Wet Pond#2(Spec#14) Impervious: 10.84
Turf(Pervious): 5.67
Total Impervious Cover Treated(acres) 10.84
Total Turf Area Treated(acres) 5.67
Total TP Load Reduction Achieved in D.A.A(Ib/yr) 19.62
Total TN Load Reduction Achieved in D.A.A(Ib/yr) 74.87
Drainage Area B Summary
Land Cover Summary
A Soils B Soils C Soils D Soils Total %of Total
Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00
Turf(acres) 0.00 5.50 2.65 0.00 8.15 49.10
Impervious(acres) 0.00 6.69 1.76 0.00 8.45 50.90
16.60
BMP Selections
Practice Credit Area(acres) Downstream
Practice
13.c.Wet Pond#2(Spec#14) impervious: 8.45
Turf(Pervious): 8.15
Total Impervious Cover Treated(acres) 8.45
Total Turf Area Treated(acres) 8.15
Total TP Load Reduction Achieved in D.A.A(Ib/yr) 16.59
Total TN Load Reduction Achieved in D.A.A(Ib/yr) 63.30
Drainage Area C Summary
Land Cover Summary
A Soils B Soils C Soils D Soils Total %of Total
Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00
Turf(acres) 0.00 0.78 0.67 0.00 1.45 78.38
Impervious(acres) 0.00 0.34 0.06 0.00 0.40 21.62
1.85
BMP Selections
Practice Credit Area(acres) Downstream
Practice
Total Impervious Cover Treated(acres) 0.00
Total Turf Area Treated(acres) 0.00
Total TP Load Reduction Achieved in D.A.A(Ib/yr) 0.00
Total TN Load Reduction Achieved in D.A.A(Ib/yr) 0.00
Summary Print
Virginia Runoff Reduction Method Worksheet
Channel and Flood Protection
Weighted CN 1-year 2-year storm 10-year
storm Adjusted CN storm
Adjusted Adjusted
CN CN
Target Rainfall Event(in) 3.50 3.70 5.60
D.A.A CN 87 87 87 87
D.A.B CN 82 82 82 82
D.A.C CN 74 74 74 74
D.A.D CN 0 #N/A #N/A #N/A
D.A.E CN 0 #N/A #N/A #N/A
Summary Print
Soils Mapping (Source: NRCS Web Soil Survey Online Database)
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SCS TR-55 Calculations
(Revised)
U.S.Department of Agriculture FL-ENG-21A
Natural Resources Conservation Service 06/04
TR 55 Worksheet 2:Runoff Curve Number and Runoff
Project: Foothill Crossing II Designed By:KKW,PE Date: 6/29/2016
Location: Crozet,VA Checked By:FGM,PE Date: 6/29/2016
Check One: Present X Developed X
1.Runoff curve Number(CN) Revisions are limited to those shown in yellom
Drainage Area Soil name and Cover description CN(weighted)=
hydrologic rou Area Product of CN Calculated 1S1
Description group (Cover type,treatment,and hydrologic condition;percent CN total product/
p (Acres) x Area Value
(Appendix A) impervious;unconnected/connected impervious area ratio) total area
B Impervious Areas 98 0.00 0.0
B Woods in Good Condition 55 9.12 501.6
D.A#1 B Lawns in Good Condition(75%+Groundcover) 61 1.93 117.7 61 6.37
(Present) C Impervious Areas 98 0.00 0.0
C Woods in Good Condition 70 4.94 345.8
C Lawns in Good Condition(75%+Groundcover) 74 0.92 68.1
B Impervious Areas 98 0.17 16.7
B Woods in Good Condition 55 5.20 286.0
D.A#2 B Lawns in Good Condition (Reduced by 2.87 ac.) 61 7.59 463.0 63 5.86
(Present) C Impervious Areas 98 0.00 0.0
C Woods in Good Condition 70 1.14 79.8
C Lawns in Good Condition(75%+Groundcover) 74 3.95 292.3
B Impervious Areas (Increased from 7.30 ac.to 7.62 ac.) 98 7.62 746.8
(Excess capacity reduced from 5.7ac.to 5.38 ac.of Imp.Area)
D.A#1A B Woods in Good Condition 55 0.00 0.0
(Developed) B Lawns in Good Condition (Reduced by 0.32ac.) 61 3.03 184.8 87 1.45
C Impervious Areas(+Excess Capacity for 2.82 ac Imp.) 98 3.22 315.6
C Woods in Good Condition 70 0.00 0.0
C Lawns in Good Condition(75%+Groundcover) 74 2.64 195.4
B Impervious Areas (Reduced from 7.36ac.to 6.69ac.) 98 6.69 655.6
(Excess capacity increased from 0.46 ac.to 1.13 ac.of Imp.Area)
D.A#2B 8 Woods in Good Condition 55 0.00 0.0
(Developed) B Lawns in Good Condition (Reduced by 2.2 ac.) 61 5.50 335.5 82 2.21
C Impervious Areas(+Excess Capacity for 0.39 ac Imp.) 98 1.76 172.5
C Woods in Good Condition 70 0.00 0.0
C Lawns in Good Condition(75%+Groundcover) 74 2.65 196.1
B Impervious Areas 98 0.34 33.3
B Woods in Good Condition 55 0.00 0.0
D.A#2C B Lawns in Good Condition(75%+Groundcover) 61 0.78 47.6 74 3.57
(Developed) C Impervious Areas 98 0.06 5.9
C Woods in Good Condition 70 0.00 0.0
C Lawns in Good Condition(75%+Groundcover 74 0.67 49.6
2.Runoff
1-Year Storm 2-Year Storm 10-Year Storm Drainage Area Description
Frequency-years 1 2 10 n/a
Rainfall,P(24 hour)-inches 3.5 3.7 5.6 n/a
Runoff,Q-inches 0.58 0.67 1.75 D.A#1(Present)
Runoff,0-inches 0.66 0.76 1.90 D.A#2(Present)
Runoff,Q-inches 2.21 2.40 4.17 D.A#1A(Developed)
Runoff,Q-inches 1.78 1.94 3.61 D.A#28(Developed)
Runoff,Cl-inches 1.22 1.36 2.82 D.A#2C(Developed)
TR 55 Worksheet 3:Time of Concentration(Ta)or Travel Time(T,)
Project: Foothill Crossing II Designed By:KKW,PE Date: 6/2/2015
Location: Crozet,VA Checked By:KKW,PE Date: 6/2/2015
Check One: Present X Developed X
Check One: T, X T, Through subarea
D.A#1 D.A#2 D.A#1A D.A#2B D.A#2C
Segment ID: (Present) (Present) (Developed) (Developed) (Developed)
Sheet Flow:(Applicable to T,only)
1 Surface description(Table 3-1) Dense Grass Dense Grass Dense Grass Dense Grass Dense Grass
2 Manning's roughness coeff.,n(Table 3-1 0.24 0.24 0.24 0.24 0.24
3 Flow length,L(total L<100)(ft) 100 100 100 100 100
4 Two-year 24-hour rainfall,P2(in.) 3.7 3.7 3.7 3.7 3.7
5 Land slope,s(ft/ft) 0.01 0.02 0.02 0.04 0.03
6 Compute Tt=[0.007(n*L)°'8]/P20.5
2'5 s°'4 0.29 0.22 0.22 0.17 0.19
Shallow Concentrated Flow:
7 Surface description(paved or unpaved) Unpaved Unpaved Unpaved Unpaved Unpaved
8 Flow Length,L(ft) 952 755 117 96 237
9 Watercourse slope,s(ft/ft) 0.041 0.066 0.026 0.042 0.059
10 Average velocity,V(Figure 3-1)(ft/s) 3.2 4.2 2.6 3.3 4.5
11 Tt=L/3600*V I 0.08 I 0.05 I 0.01 I 0.01 I 0.01 I
Channel Flow: `w `w w
12 Cross sectional flow area,a(ft2) w 3 v
E E E
13 Wetted perimeter,Pw(ft) o o `o
14 Hydraulic radius,r=a/Pw(ft) N/A N/A •c o .E o E o
15 Channel Slope,s(ft/ft) cu 0• v E ov E ov
16 Manning's Roughness Coeff,n
To Tu Z
17V=[1.49rV3s°'5]/n
18 Flow length,L(ft) it F- it
19 T,=L/3600*V 0.00 0.00 0.00 I 0.00 I 0.00 I
20 Watershed or subarea T,or T,
(Add T,in steps 6,11 and 19) I 0.37 I 0.27 I 0.23 I 0.18 I 0.20 I
U.S.Department of Agriculture
Natural Resources Conservation Service
TR 55 Worksheet 4:Graphical Peak Discharge Method
Project: Foothill Crossing II Designed By: KKW,PE Date: 6/29/2016
Location: Crozet,VA Checked By: FGM,PE Date: 6/29/2016
Check One: Present X Developed X
Revisions are limited to those shown in yellow
Drainage Area Drainage Area Drainage Area Drainage Area Drainage Area
1.Data Description Description Description Description Description
D.A#1 D.A#2 D.A#1A D.A#2B D.A#2C
(Present) (Present) (Developed) (Developed) (Developed)
Drainage Area(Am)in miles?= 0.0264 0.0282 0.0258 0.0259 0.0029
Runoff curve number CN= 61 63 87 82 74
Time of concentration(Tc). 0.37 0.27 0.23 0.18 0.20
Rainfall distribution type= II II II II II
Pond and swamp areas spread 0 0 0 0 0
throughout the watershed=
2.Frequency-years 1 2 10 1 2 10 1 2 10 1 2 10 1 2 10
3.Rainfall,P(24 hour)-inches 3.5 3.7 5.6 3.5 3.7 5.6 3.5 3.7 5.6 3.5 3.7 5.6 3.5 3.7 5.6
4.Initial Abstraction,la-inches 1.273 1.273 1.273 1.173 1.173 1.173 0.289 0.289 0.289 0.442 0.442 0.442 0.713 0.713 0.713
5.Compute la/P 0.36 0.34 0.23 0.34 0.32 0.21 0.08 0.08 0.05 0.13 0.12 0.08 0.20 0.19 0.13
6.Unit peak discharge,Qu-csm/ir 450 480 550 560 595 655 - - - - - 740 755 800
7.Runoff,Q from Worksheet 2-inches 0.58 0.67 1.75 0.66 0.76 1.90 2.21 2.40 4.17 1.78 1.94 3.61 1.22 1.36 2.82
8.Pond and Swamp adjustment factor,Fp 1 1 1 1I. 1 1 1 1 1
9.Peak Discharge,Qp-cfs 6.86 8.49 25.44 10.44 12.77 35.18 ROUTED ROUTED 2.61 2.97 6.53
These pre-dev.flows are smaller/more conservative
Summary of Watersheds Summary of Drainage Areas
1-Year 2-Year 10-Year Predevelopment Post-Development
Predevelopment(cfs) 'ost-Development(cfs) Predevelopment{cfs) 'ost-Development(cfs)'Predevelo ment(cfs)'ost-Development(cfsj D.A.#1 16.91 D.A.#1A 16.51
D.A.#1 6.86 D.A.#1A 1.48 D.A.41 8.49 D.A.#1A _ 1.61 D.A.#1 25.44 D.A.#1A 2.39 D.A.#2B 16.60
D.A.#2B 0.93 D.A.#28 0.97 D.A.#2 D.A.#2B 15.74 D.A.#2 18.05 D.A.#21 1.85
DA.#2 10.44 D.A.#2C 2.61 D.A.#2 12.77 D.A.#2C 2.97 35.18 D.A.#2C 6.53 Totals: 34.96 34.96
Totals: 17.30 5.02 Totals: 21.26 5.55 Totals: 60.62 24.66
Post-Development Routing Calculations
(Revised per updated Basin B Routings)
villas Level II wet Pond-A-new
BasinFlow printout
INPUT:
Basin: Foothills Crossing II - Wet Pond Level II 'A' Design
12 Contour Areas
Elevation(ft) Area(sf) Computed Vol . (cy)
626.00 1409.00 0.0
628.00 3497.00 175.9
629.00 4762.00 328.3
630.00 6141.00 529.7
631.00 9357.00 814.6
632.00 13497.00 1235.5
632.40 20122.00 1482.9
634.00 24142.00 2792.6
636.00 28144.00 4727.2
638.00 32372.00 6966.7
640.00 36827.00 9527.9
641.50 40316.00 11670.0
Start_Elevation(ft) 632.00 vol . (cy) 1235.46
6 Outlet Structures
Outlet structure 0
Orifice
name: Low-Flow Orifices
area (sf) 0.087
diameter or depth (in) 4.000
width for rect. (in) 0.000
coefficient 0.600
invert (ft) 632.000
multiple 1
discharge into riser
Outlet structure 1
Orifice
name: Mid-Flow Orifices
area (sf) 0.087
diameter or depth (in) 4.000
width for rect. (in) 0.000
coefficient 0.600
invert (ft) 635.000
multiple 1
discharge into riser
outlet structure 2
weir
name: Emergency Spillway
length (ft) 30.000
side angle 71.500
coefficient 3.300
invert (ft) 640.000
multiple 1
discharge through dam
Outlet structure 3
Curve
name: Anti-vortex Device
multiple 1
Invert (ft) 638.500
discharge into riser
file: thirtysix.txt
Page 1
Villas Level II Wet Pond-A-new
Outlet structure 4
Culvert
name: Barrel
multiple 1
discharge out of riser
D (in) 30.000
h (in) 0.000
Length (ft) 166.000
Slope 0.012
Manning's n 0.013
Inlet coeff. Ke 0.500
Equation constant set 3
Invert (ft) 626.000
Outlet structure 5
Orifice
name: Inverted Pipe
area (sf) 0.049
diameter or depth (in) 3.000
width for rect. (in) 0.000
coefficient 0.600
invert (ft) 631.000
multiple 1
discharge into riser
4 inflow Hydrographs
Hydrograph 0
SCS
name: 1-Year 24-Hour SCS Method Storm
Area (acres) 16.510
CN 87.000
Type 2
rainfall , P (in) 3.500
time of conc. (hrs) 0.2300
time increment (hrs) 0.0200
time limit (hrs) 30.000
fudge factor 1.00
routed true
peak flow (cfs) 37.621
peak time (hrs) 11.991
volume (cy) 4839.119
Hydrograph 1
SCS
name: 2-Year 24-Hour SCS Method Storm
Area (acres) 16.510
CN 87.000
Type 2
rainfall , P (in) 3.700
time of conc. (hrs) 0.2300
time increment (hrs) 0.0200
time limit (hrs) 30.000
fudge factor 1.00
routed true
peak flow (cfs) 40.733
peak time (hrs) 11.991
volume (cy) 5239.494
Hydrograph 2
SCS
name: 10-Year 24-Hour SCS Method Storm
Area (acres) 16.510
Page 2
villas Level II wet Pond-A-new
CN 87.000
Type 2
rainfall , P (in) 5.600
time of conc. (hrs) 0.2300
time increment (hrs) 0.0200
time limit (hrs) 30.000
fudge factor 1.00
routed true
peak flow (cfs) 71.287
peak time (hrs) 11.991
volume (cy) 9169.618
Hydrograph 3
SCS
name: 100-Year 24-Hour SCS Method Storm
Area (acres) 16.510
CN 87.000
Type 2
rainfall , P (in) 9.100
time of conc. (hrs) 0.2300
time increment (hrs) 0.0200
time limit (hrs) 30.000
fudge factor 1.00
routed true
peak flow (cfs) 129.695
peak time (hrs) 11.991
volume (cy) 16682.513
OUTPUT:
Routing Method: storage-indication
Hydrograph 0
Routing Summary of Peaks: 1-Year 24-Hour SCS Method Storm
inflow (cfs) 37.434 at 11.98 (hrs)
discharge (cfs) 1.475 at 13.80 (hrs)
water level (ft) 635.449 at 13.96 (hrs)
storage (cy) 4164.447
Hydrograph 1
Routing Summary of Peaks: 2-Year 24-Hour SCS Method Storm
inflow (cfs) 40.531 at 11.98 (hrs)
discharge (cfs) 1.606 at 13.92 (hrs)
water level (ft) 635.709 at 13.94 (hrs)
storage (cy) 4426.913
Hydrograph 2
Routing Summary of Peaks: 10-Year 24-Hour SCS Method Storm
inflow (cfs) 70.933 at 11.98 (hrs)
discharge (cfs) 2.386 at 14.40 (hrs)
water level (ft) 638.176 at 14.40 (hrs)
storage (cy) 7178.537
Hydrograph 3
Routing Summary of Peaks: 100-Year 24-Hour SCS Method Storm
inflow (cfs) 129.051 at 11.98 (hrs)
discharge (cfs) 51.479 at 12.18 (hrs)
water level (ft) 640.195 at 12.18 (hrs)
storage (cy) 9795.943
Tue Aug 25 12:31:39 EDT 2015
Page 3
villas Level II Wet Pond-B-alternate
BasinFlow printout
INPUT:
Basin: Foothills Crossing II - Wet Pond Level II 'B' Design
11 Contour Areas
Elevation(ft) Area(sf) Computed Vol . (cy)
648.00 1673.00 0.0
649.00 2446.00 75.8
650.00 3361.00 182.9
652.00 5618.00 511.9
653.00 7641.00 756.5
654.00 11691.00 1111.8
654.40 17012.00 1323.2
656.00 19772.00 2412.1
658.00 23291.00 4005.2
660.00 27037.00 5867.5
662.00 31008.00 8015.7
Start_Elevation(ft) 654.00 Vol . (cy) 1111.84
6 Outlet Structures
Outlet structure 0
orifice
name: Low-Flow Orifices
area (sf) 0.049
diameter or depth (in) 3.000
width for rect. (in) 0.000
coefficient 0.600
invert (ft) 654.000
multiple 1
discharge into riser
Outlet structure 1
Orifice
name: Mid-Flow Orifices
area (sf) 0.087
diameter or depth (in) 4.000
width for rect. (in) 0.000
coefficient 0.600
invert (ft) 658.000
multiple 1
discharge into riser
Outlet structure 2
weir
name: Emergency Spillway
length (ft) 35.000
side angle 78.460
coefficient 3.300
invert (ft) 660.250
multiple 1
discharge through dam
Outlet structure 3
Curve
name: Anti-Vortex Device
multiple 1
Invert (ft) 659.000
discharge into riser
file: fortyeight.txt
Page 1
Villas Level II Wet Pond-B-alternate
Outlet structure 4
Culvert
name: Barrel
multiple 1
discharge out of riser
D (in) 30.000
h (in) 0.000
Length (ft) 100.000
Slope 0.005
Manning's n 0.013
Inlet coeff. Ke 0.500
Equation constant set 3
Invert (ft) 653.000
Outlet structure 5
orifice
name: Inverted Pipe
area (sf) 0.049
diameter or depth (in) 3.000
width for rect. (in) 0.000
coefficient 0.600
invert (ft) 653.000
multiple 1
discharge into riser
4 Inflow Hydrographs
Hydrograph 0
SCS
name: 1-Year 24-Hour SCS Method Storm
Area (acres) 16.600
CN 82.000
Type 2
rainfall , P (in) 3.500
time of conc. (hrs) 0.1800
time increment (hrs) 0.0200
time limit (hrs) 30.000
fudge factor 1.00
routed true
peak flow (cfs) 33.012
peak time (hrs) 11.970
volume (cy) 3974.645
Hydrograph 1
SCS
name: 2-Year 24-Hour SCS Method Storm
Area (acres) 16.600
CN 82.000
Type 2
rainfall , P (in) 3.700
time of conc. (hrs) 0.1800
time increment (hrs) 0.0200
time limit (hrs) 30.000
fudge factor 1.00
routed true
peak flow (cfs) 36.093
peak time (hrs) 11.970
volume (cy) 4345.638
Page 2
villas Level II Wet Pond-B-alternate
Hydrograph 2
scS
name: 10-Year 24-Hour SCS Method Storm
area (acres) 16.600
CN 82.000
Type 2
rainfall , P (in) 5.600
time of conc. (hrs) 0.1800
time increment (hrs) 0.0200
time limit (hrs) 30.000
fudge factor 1.00
routed true
peak flow (cfs) 67.055
peak time (hrs) 11.970
volume (cy) 8073.432
Hydrograph 3
SCS
name: 100-Year 24-Hour SCS Method Storm
area (acres) 16.600
CN 82.000
Type 2
rainfall , P (in) 9.100
time of conc. (hrs) 0.1800
time increment (hrs) 0.0200
time limit (hrs) 30.000
fudge factor 1.00
routed true
peak flow (cfs) 127.960
peak time (hrs) 11.970
volume (cy) 15406.399
OUTPUT:
Routing Method: storage-indication
Hydrograph 0
Routing Summary of Peaks: 1-Year 24-Hour SCS Method Storm
inflow (cfs) 33.012 at 11.96 (hrs)
discharge (cfs) 0.930 at 14.88 (hrs)
water level (ft) 657.511 at 14.94 (hrs)
storage (cy) 3591.360
Hydrograph 1
Routing Summary of Peaks: 2-Year 24-Hour SCS Method Storm
inflow (cfs) 36.093 at 11.96 (hrs)
discharge (cfs) 0.968 at 14.48 (hrs)
water level (ft) 657.841 at 15.14 (hrs)
storage (cy) 3868.869
Hydrograph 2
Routing Summary of Peaks: 10-Year 24-Hour SCS Method Storm
inflow (cfs) 67.055 at 11.96 (hrs)
discharge (cfs) 15.737 at 12.22 (hrs)
water level (ft) 659.637 at 12.22 (hrs)
storage (cy) 5508.693
Hydrograph 3
Routing Summary of Peaks: 100-Year 24-Hour SCS Method Storm
inflow (cfs) 127.960 at 11.96 (hrs)
discharge (cfs) 115.628 at 12.02 (hrs)
water level (ft) 660.846 at 12.02 (hrs)
storage (cy) 6740.742
wed Jun 29 14:17:50 EDT 2016
Page 3
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