SW5240601_Stormwater Report_20240617

1
Watershed Model Schematic Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023
r �4-Pre-Dev to Analysis Point'B'
C2Pe-Dev to Analysis Point'A'
�
o t1Pst-Dev'A'Pond
�5 Po
st-Dev Pst-Dev to Analysis Point'B'
�
V
1.13-Pond'A'
Legend
Hyd. Origin Description
1 SCS Runoff Post-Dev'A'Pond
2 SCS Runoff Pre-Dev to Analysis Point'A'
3 Reservoir Pond'A'
4 SCS Runoff Pre-Dev to Analysis Point'B'
5 SCS Runoff Post-Dev to Analysis Point'B'
Project: SBI HQ.gpw Wednesday, 05/8/2024

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Hydrograph Return Period Recap Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023
I
Hyd. Hydrograph Inflow Peak Outflow(cfs) Hydrograph
No. type hyd(s) Description
(origin) 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr
1 SCS Runoff 13.16 18.21 26.18 32.74 41.70 56.42 Post-Dev'A'Pond
2 SCS Runoff 5.005 7.728 12.22 16.06 21.45 30.57 Pre-Dev to Analysis Point'A'
3 Reservoir 1 1.699 5.311 12.13 21.75 33.29 41.20 Pond'A'
4 SCS Runoff 2.050 3.153 4.970 6.520 8.701 12.41 Pre-Dev to Analysis Point'B'
5 SCS Runoff 1.575 2.387 3.718 4.847 6.425 9.100 Post-Dev to Analysis Point'B'
Proj. file: SBI HQ.gpw Wednesday, 05/8/2024

3
Hydrograph Summary Report Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023
Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph
No. type flow interval Peak volume hyd(s) elevation strge used Description
(origin) (cfs) (min) (min) (cuft) (ft) (cuft)
1 SCS Runoff 13.16 2 734 57,751 Post-Dev'A'Pond
2 SCS Runoff 5.005 2 742 29,898 i Pre-Dev to Analysis Point'A'
3 Reservoir 1.699 2 796 55,480 1 331.25 31,381 Pond'A'
4 SCS Runoff 2.050 2 736 10,255 Pre-Dev to Analysis Point'B'
5 SCS Runoff 1.575 2 738 8,326 Post-Dev to Analysis Point'B'
SBI HQ.gpw Return Period: 1 Year Wednesday, 05/8/2024

4
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 1
Post-Dev 'A' Pond
Hydrograph type = SCS Runoff Peak discharge = 13.16 cfs
Storm frequency = 1 yrs Time to peak = 734 min
Time interval = 2 min Hyd. volume = 57,751 cuft
Drainage area = 12.080 ac Curve number = 82*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 30.80 min
Total precip. = 2.90 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
*Composite(Area/CN)=[(6.550 x 98)+(0.700 x 85)+(4.830 x 61)]/12.080
Post-Dev 'A' Pond
Q (cfs) Hyd. No. 1 -- 1 Year Q (cfs)
14.00 14.00
12.00 12.00
10.00 10.00
8.00 8.00
6.00 6.00
4.00 I 4.00
2.00 2.00
0.00 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 1 Time (min)

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TR55 Tc Worksheet
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023
Hyd. No. 1
Post-Dev 'A' Pond
Description A B C Totals
Sheet Flow
Manning's n-value = 0.410 0.011 0.011
Flow length (ft) = 176.0 0.0 0.0
Two-year 24-hr precip. (in) = 2.25 3.50 0.00
Land slope (%) = 5.00 0.00 0.00
Travel Time (min) = 28.46 + 0.00 + 0.00 = 28.46
Shallow Concentrated Flow
Flow length (ft) = 160.00 0.00 0.00
Watercourse slope (%) = 1.25 0.00 0.00
Surface description = Unpaved Paved Paved
Average velocity (ft/s) =1.80 0.00 0.00
Travel Time (min) = 1.48 + 0.00 + 0.00 = 1.48
Channel Flow
X sectional flow area (sqft) = 1.77 3.14 0.00
Wetted perimeter(ft) = 4.71 6.28 0.00
Channel slope (%) = 2.40 2.40 0.00
Manning's n-value = 0.013 0.013 0.015
Velocity (ft/s) =9.22
11.16
0.00
Flow length (ft) ({0})400.0 115.0 0.0
Travel Time (min) = 0.72 + 0.17 + 0.00 = 0.90
Total Travel Time, Tc 30.80 min

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Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 2
Pre-Dev to Analysis Point 'A'
Hydrograph type = SCS Runoff Peak discharge = 5.005 cfs
Storm frequency = 1 yrs Time to peak = 742 min
Time interval = 2 min Hyd. volume = 29,898 cuft
Drainage area = 9.830 ac Curve number = 74*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 45.80 min
Total precip. = 2.90 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
*Composite(Area/CN)=[(2.130 x 98)+(0.190 x 85)+(2.050 x 61)+(5.460 x 69)]/9.830
Pre-Dev to Analysis Point 'A'
Q (cfs) Hyd. No. 2 -- 1 Year Q (cfs)
6.00 6.00
5.00 1 5.00
4.00 4.00
3.00 3.00
2.00 2.00
....................:::........__________
1.00 1.00
0.00 - - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 2 Time (min)

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TR55 Tc Worksheet
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023
Hyd. No. 2
Pre-Dev to Analysis Point 'A'
Description A B C Totals
Sheet Flow
Manning's n-value = 0.410 0.011 0.011
Flow length (ft) = 300.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.50 0.00 0.00
Land slope (%) = 3.03 0.00 0.00
Travel Time (min) = 42.71 + 0.00 + 0.00 = 42.71
Shallow Concentrated Flow
Flow length (ft) = 14.18 220.00 55.13
Watercourse slope (%) = 4.94 1.36 2.50
Surface description = Unpaved Paved Unpaved
Average velocity (ft/s) =3.59 2.37 2.55
Travel Time (min) = 0.07 + 1.55 + 0.36 = 1.97
Channel Flow
X sectional flow area (sqft) = 4.91 5.00 0.00
Wetted perimeter(ft) = 7.85 10.20 0.00
Channel slope (%) = 1.15 2.55 0.00
Manning's n-value = 0.015 0.026 0.015
Velocity (ft/s) =7.78
5.68
0.00
Flow length (ft) ({0})196.6 237.3 0.0
Travel Time (min) = 0.42 + 0.70 + 0.00 = 1.12
Total Travel Time, Tc 45.80 min

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Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 3
Pond 'A'
Hydrograph type = Reservoir Peak discharge = 1.699 cfs
Storm frequency = 1 yrs Time to peak = 796 min
Time interval = 2 min Hyd. volume = 55,480 cuft
Inflow hyd. No. = 1 - Post-Dev 'A' Pond Max. Elevation = 331.25 ft
Reservoir name = Pond 'A' Max. Storage = 31,381 cuft
Storage Indication method used.
Pond 'A'
Q (cfs) Hyd. No. 3 -- 1 Year Q (cfs)
14.00 14.00
12.00 12.00
10.00 10.00
8.00 8.00
6.00 6.00
4.00 4.00
2.00 i 2.00
0.00 - 0.00
0 600 1200 1800 2400 3000 3600 4200 4800 5400 6000
Time (min)
Hyd No. 3 Hyd No. 1 111111111 Total storage used = 31,381 cuft

Pond Report 9
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Pond No. 1 - Pond 'A'
Pond Data
Contours-User-defined contour areas.Conic method used for volume calculation.Begining Elevation=329.50 ft
Stage/Storage Table
Stage(ft) Elevation(ft) Contour area(sqft) Incr.Storage(cuft) Total storage(cuft)
0.00 329.50 15,805 0 0
0.50 330.00 17,358 8,287 8,287
1.50 331.00 18,967 18,155 26,442
2.50 332.00 20,632 19,792 46,233
3.50 333.00 22,354 21,485 67,718
4.50 334.00 24,132 23,235 90,953
Culvert/Orifice Structures Weir Structures
[A] [B] [C] [PrfRsr] [A] [B] [C] [D]
Rise(in) = 24.00 2.25 8.00 0.00 Crest Len(ft) = 16.00 Inactive 10.00 0.00
Span(in) = 24.00 2.25 36.00 0.00 Crest El.(ft) = 332.00 330.97 333.00 0.00
No.Barrels = 1 1 1 0 Weir Coeff. = 3.33 3.33 3.33 3.33
Invert El.(ft) = 325.50 329.50 330.97 0.00 Weir Type = 1 Rect Broad ---
Length(ft) = 42.00 0.67 0.67 0.00 Multi-Stage = Yes No No No
Slope(%) = 1.20 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 Wet area)
Multi-Stage = n/a Yes Yes No TW Elev.(ft) = 0.00
Note:Culvert/Orifice outflows are analyzed under inlet(ic)and outlet(oc)control. Weir risers checked for orifice conditions(ic)and submergence(s).
Stage(ft) Stage/ Discharge Elev(ft)
5.00 334.50
I
4.00 333.50
3.00 - 332.50
2.00 331.50
1.00 330.50
0.00 329.50
0.00 8.00 16.00 24.00 32.00 40.00 48.00 56.00 64.00 72.00 80.00
Total Q Discharge(cfs)

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Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 4
Pre-Dev to Analysis Point 'B'
Hydrograph type = SCS Runoff Peak discharge = 2.050 cfs
Storm frequency = 1 yrs Time to peak = 736 min
Time interval = 2 min Hyd. volume = 10,255 cuft
Drainage area = 3.380 ac Curve number = 74*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 35.50 min
Total precip. = 2.90 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
*Composite(Area/CN)=[(1.160 x 98)+(2.220 x 61)]/3.380
Pre-Dev to Analysis Point 'B'
Q (cfs) Hyd. No. 4 -- 1 Year Q (cfs)
3.00 - 3.00
2.00 2.00
1.00 - 1.00
0.00 - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 4 Time (min)

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TR55 Tc Worksheet
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023
Hyd. No. 4
Pre-Dev to Analysis Point 'B'
Description A B C Totals
Sheet Flow
Manning's n-value = 0.410 0.011 0.011
Flow length (ft) = 300.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.50 0.00 0.00
Land slope (%) = 4.83 0.00 0.00
Travel Time (min) = 35.44 + 0.00 + 0.00 = 35.44
Shallow Concentrated Flow
Flow length (ft) = 4.32 0.00 0.00
Watercourse slope (%) = 4.17 0.00 0.00
Surface description = Unpaved Paved Paved
Average velocity (ft/s) =3.29 0.00 0.00
Travel Time (min) = 0.02 + 0.00 + 0.00 = 0.02
Channel Flow
X sectional flow area (sqft) = 0.00 0.00 0.00
Wetted perimeter(ft) = 0.00 0.00 0.00
Channel slope (%) = 0.00 0.00 0.00
Manning's n-value = 0.015 0.015 0.015
Velocity (ft/s) =0.00
0.00
0.00
Flow length (ft) ({0})0.0 0.0 0.0
Travel Time (min) = 0.00 + 0.00 + 0.00 = 0.00
Total Travel Time, Tc 35.50 min

12
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 5
Post-Dev to Analysis Point 'B'
Hydrograph type = SCS Runoff Peak discharge = 1.575 cfs
Storm frequency = 1 yrs Time to peak = 738 min
Time interval = 2 min Hyd. volume = 8,326 cuft
Drainage area = 2.560 ac Curve number = 75*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 39.50 min
Total precip. = 2.90 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
*Composite(Area/CN)=[(0.980 x 98)+(1.580 x 61)]/2.560
Post-Dev to Analysis Point 'B'
Q (cfs) Hyd. No. 5-- 1 Year Q (cfs)
2.00 2.00
1.00 1.00
0.00 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 5 Time (min)

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TR55 Tc Worksheet
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023
Hyd. No. 5
Post-Dev to Analysis Point 'B'
Description A B C Totals
Sheet Flow
Manning's n-value = 0.410 0.011 0.011
Flow length (ft) = 299.9 0.0 0.0
Two-year 24-hr precip. (in) = 3.50 0.00 0.00
Land slope (%) = 3.88 0.00 0.00
Travel Time (min) = 38.68 + 0.00 + 0.00 = 38.68
Shallow Concentrated Flow
Flow length (ft) = 0.00 0.00 0.00
Watercourse slope (%) = 0.00 0.00 0.00
Surface description = Paved Paved Paved
Average velocity (ft/s) =0.00 0.00 0.00
Travel Time (min) = 0.00 + 0.00 + 0.00 = 0.00
Channel Flow
X sectional flow area (sqft) = 0.55 0.00 0.00
Wetted perimeter(ft) = 2.62 0.00 0.00
Channel slope (%) = 3.30 0.00 0.00
Manning's n-value = 0.015 0.015 0.015
Velocity (ft/s) =6.31
0.00
0.00
Flow length (ft) ({0})310.8 0.0 0.0
Travel Time (min) = 0.82 + 0.00 + 0.00 = 0.82
Total Travel Time, Tc 39.50 min

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Hydrograph Summary Report Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023
Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph
No. type flow interval Peak volume hyd(s) elevation strge used Description
(origin) (cfs) (min) (min) (cuft) (ft) (cuft)
1 SCS Runoff 32.74 2 732 141,481 Post-Dev'A'Pond
2 SCS Runoff 16.06 2 742 87,008 Pre-Dev to Analysis Point'A'
3 Reservoir 21.75 2 748 139,122 1 332.36 53,985 Pond'A'
4 SCS Runoff 6.520 2 736 29,844 Pre-Dev to Analysis Point'B'
5 SCS Runoff 4.847 2 738 23,668 Post-Dev to Analysis Point'B'
SBI HQ.gpw Return Period: 10 Year Wednesday, 05/8/2024

15
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 1
Post-Dev 'A' Pond
Hydrograph type = SCS Runoff Peak discharge = 32.74 cfs
Storm frequency = 10 yrs Time to peak = 732 min
Time interval = 2 min Hyd. volume = 141,481 cuft
Drainage area = 12.080 ac Curve number = 82*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 30.80 min
Total precip. = 5.12 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
*Composite(Area/CN)=[(6.550 x 98)+(0.700 x 85)+(4.830 x 61)]/12.080
Post-Dev 'A' Pond
Q (cfs) Hyd. No. 1 -- 10 Year Q (cfs)
35.00 - 35.00
I
30.00 30.00
25.00 25.00
20.00 20.00
15.00 15.00
10.00 10.00
5.00 5.00
II
0.00 - 7 - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 1 Time (min)

16
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 2
Pre-Dev to Analysis Point 'A'
Hydrograph type = SCS Runoff Peak discharge = 16.06 cfs
Storm frequency = 10 yrs Time to peak = 742 min
Time interval = 2 min Hyd. volume = 87,008 cuft
Drainage area = 9.830 ac Curve number = 74*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 45.80 min
Total precip. = 5.12 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
*Composite(Area/CN)=[(2.130 x 98)+(0.190 x 85)+(2.050 x 61)+(5.460 x 69)]/9.830
Pre-Dev to Analysis Point 'A'
Q (cfs) Hyd. No. 2 -- 10 Year Q (cfs)
18.00 - - - 18.00
1
15.00 15.00
12.00 12.00
9.00 9.00
6.00 6.00
3.00 3.00
0.00 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 2 Time (min)

17
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 3
Pond 'A'
Hydrograph type = Reservoir Peak discharge = 21.75 cfs
Storm frequency = 10 yrs Time to peak = 748 min
Time interval = 2 min Hyd. volume = 139,122 cuft
Inflow hyd. No. = 1 - Post-Dev 'A' Pond Max. Elevation = 332.36 ft
Reservoir name = Pond 'A' Max. Storage = 53,985 cuft
Storage Indication method used.
Pond 'A'
Q (cfs) Hyd. No. 3 -- 10 Year Q (cfs)
35.00 35.00
30.00 30.00
25.00 25.00
20.00 20.00
1
1
I _
15.00 I 15.00
10.00 10.00
5.00 5.00
0.00 - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 3 Hyd No. 1 111111111 Total storage used = 53,985 cuft

18
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 4
Pre-Dev to Analysis Point 'B'
Hydrograph type = SCS Runoff Peak discharge = 6.520 cfs
Storm frequency = 10 yrs Time to peak = 736 min
Time interval = 2 min Hyd. volume = 29,844 cuft
Drainage area = 3.380 ac Curve number = 74*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 35.50 min
Total precip. = 5.12 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
*Composite(Area/CN)=[(1.160 x 98)+(2.220 x 61)]/3.380
Pre-Dev to Analysis Point 'B'
Q (cfs) Hyd. No. 4 -- 10 Year Q (cfs)
7.00 7.00
6.00 6.00
5.00 — 5.00
4.00 4.00
3.00 3.00
I
2.00 2.00
1.00 1.00
J
0.00 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 4 Time (min)

19
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 5
Post-Dev to Analysis Point 'B'
Hydrograph type = SCS Runoff Peak discharge = 4.847 cfs
Storm frequency = 10 yrs Time to peak = 738 min
Time interval = 2 min Hyd. volume = 23,668 cuft
Drainage area = 2.560 ac Curve number = 75*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 39.50 min
Total precip. = 5.12 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
*Composite(Area/CN)=[(0.980 x 98)+(1.580 x 61)]/2.560
Post-Dev to Analysis Point 'B'
Q (cfs) Hyd. No. 5-- 10 Year Q (cfs)
5.00 5.00
4.00 4.00
3.00 3.00
2.00 2.00
1.00 1.00
0.00 - - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 5 Time (min)

20
Hydrograph Summary Report Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023
Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph
No. type flow interval Peak volume hyd(s) elevation strge used Description
(origin) (cfs) (min) (min) (cuft) (ft) (cuft)
1 SCS Runoff 56.42 2 732 246,281 Post-Dev'A'Pond
2 SCS Runoff 30.57 2 740 163,794 Pre-Dev to Analysis Point'A'
3 Reservoir 41.20 2 746 243,880 1 333.18 71,841 Pond'A'
4 SCS Runoff 12.41 2 734 56,182 Pre-Dev to Analysis Point'B'
5 SCS Runoff 9.100 2 736 44,094 Post-Dev to Analysis Point'B'
SBI HQ.gpw Return Period: 100 Year Wednesday, 05/8/2024

21
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 1
Post-Dev 'A' Pond
Hydrograph type = SCS Runoff Peak discharge = 56.42 cfs
Storm frequency = 100 yrs Time to peak = 732 min
Time interval = 2 min Hyd. volume = 246,281 cuft
Drainage area = 12.080 ac Curve number = 82*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 30.80 min
Total precip. = 7.67 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
*Composite(Area/CN)=[(6.550 x 98)+(0.700 x 85)+(4.830 x 61)]/12.080
Post-Dev 'A' Pond
Q (cfs) Hyd. No. 1 -- 100 Year Q (cfs)
60.00 60.00
1
50.00 50.00
40.00 40.00
30.00 � 30.00
20.00 •
20.00
10.00 10.00
0.00 - - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 1 Time (min)

22
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 2
Pre-Dev to Analysis Point 'A'
Hydrograph type = SCS Runoff Peak discharge = 30.57 cfs
Storm frequency = 100 yrs Time to peak = 740 min
Time interval = 2 min Hyd. volume = 163,794 cuft
Drainage area = 9.830 ac Curve number = 74*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 45.80 min
Total precip. = 7.67 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
*Composite(Area/CN)=[(2.130 x 98)+(0.190 x 85)+(2.050 x 61)+(5.460 x 69)]/9.830
Pre-Dev to Analysis Point 'A'
Q (cfs) Hyd. No. 2 -- 100 Year Q (cfs)
35.00 - 35.00
30.00 30.00
25.00 25.00
20.00 20.00
15.00 15.00
10.00 10.00
5.00 5.00
0.00 — 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 2 Time (min)

23
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 3
Pond 'A'
Hydrograph type = Reservoir Peak discharge = 41.20 cfs
Storm frequency = 100 yrs Time to peak = 746 min
Time interval = 2 min Hyd. volume = 243,880 cuft
Inflow hyd. No. = 1 - Post-Dev 'A' Pond Max. Elevation = 333.18 ft
Reservoir name = Pond 'A' Max. Storage = 71,841 cuft
Storage Indication method used.
Pond 'A'
Q (cfs) Hyd. No. 3 -- 100 Year Q (cfs)
60.00 60.00
50.00 50.00
40.00 40.00
30.00 30.00
20.00 20.00
10.00 10.00
0.00 - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 3 Hyd No. 1 111111111 Total storage used = 71,841 cuft

24
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 4
Pre-Dev to Analysis Point 'B'
Hydrograph type = SCS Runoff Peak discharge = 12.41 cfs
Storm frequency = 100 yrs Time to peak = 734 min
Time interval = 2 min Hyd. volume = 56,182 cuft
Drainage area = 3.380 ac Curve number = 74*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 35.50 min
Total precip. = 7.67 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
*Composite(Area/CN)=[(1.160 x 98)+(2.220 x 61)]/3.380
Pre-Dev to Analysis Point 'B'
Q (cfs) Hyd. No. 4 -- 100 Year Q (cfs)
14.00 14.00
12.00 12.00
10.00 10.00
8.00 8.00
6.00 6.00
4.00 4.00
2.00 - 2.00
0.00 - ` - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 4 Time (min)

25
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Hyd. No. 5
Post-Dev to Analysis Point 'B'
Hydrograph type = SCS Runoff Peak discharge = 9.100 cfs
Storm frequency = 100 yrs Time to peak = 736 min
Time interval = 2 min Hyd. volume = 44,094 cuft
Drainage area = 2.560 ac Curve number = 75*
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 39.50 min
Total precip. = 7.67 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
*Composite(Area/CN)=[(0.980 x 98)+(1.580 x 61)]/2.560
Post-Dev to Analysis Point 'B'
Q (cfs) Hyd. No. 5 -- 100 Year Q (cfs)
10.00 10.00
8.00 8.00
6.00 - 6.00
4.00 - 4.00
2.00 2.00
0.00 - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 5 Time (min)

26
Hydraflow Rainfall Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2023 Wednesday,05/8/2024
Return Intensity-Duration-Frequency Equation Coefficients(FHA)
Period
(Yrs) B D E (N/A)
1 67.6239 13.2000 0.9048
2 74.1911 13.1000 0.8854
3 0.0000 0.0000 0.0000
5 72.3793 12.7000 0.8349
10 72.4736 12.4000 0.8027
25 52.8649 9.5000 0.7022
50 58.8641 10.3000 0.7023
100 50.6951 8.9000 0.6490
File name:SBI HQ.IDF
Intensity= B/(Tc+ D)^E
Return Intensity Values(in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 4.90 3.93 3.30 2.84 2.50 2.24 2.03 1.86 1.71 1.59 1.48 1.39
2 5.71 4.60 3.87 3.35 2.96 2.65 2.40 2.20 2.03 1.89 1.77 1.66
3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
5 6.57 5.34 4.52 3.94 3.50 3.15 2.87 2.64 2.45 2.29 2.14 2.02
10 7.32 5.97 5.08 4.44 3.96 3.58 3.27 3.02 2.81 2.63 2.47 2.33
25 8.08 6.57 5.59 4.91 4.40 4.00 3.68 3.41 3.19 3.00 2.83 2.69
50 8.67 7.11 6.09 5.36 4.82 4.39 4.04 3.76 3.52 3.31 3.13 2.97
100 9.19 7.52 6.46 5.71 5.15 4.71 4.35 4.06 3.81 3.60 3.41 3.25
Tc=time in minutes.Values may exceed 60.
Precip.file name:Sample.pcp
Rainfall Precipitation Table (in)
Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr
SCS 24-hour 2.90 3.50 0.00 4.40 5.12 6.09 6.87 7.67
SCS 6-Hr 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00