2018-07-02_PERMIT FILE - C2010089A ‎(2)‎

• Permit No: C2010089A
• IBM Index Class Name: Permit File
• Doc Date: 7/2/2018
• Doc Name: Pond NHN-002 & Ditch Designs
• Section_Exhibit Name: Appendix 2.05.3‎(4)‎-9
• Media Type: D
• Archive: Yes

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7
Structure Detail;
Structure #7 (Erodible Channel)
South Ditch (0+00 to 7+75)
Trapezoidal Erodible Channel Inputs:
Material: Excavated overburden (sandstone)
Bottom Left Right
Freeboard Freeboard Freeboard
Limiting
Sideslope Sideslope Slope (%) Manning's n
Width (ft)
Depth:
Velocity (fps)
Ratio Ratio
Depth (ft) % of Depth Mult. x (VxD)
Velocity:
12.00 2.0:1 2.0:1 5.0 0.0350
1.00
5.0
Erodible Channel Results:
Structure #6 (Riprap Channel)
South Ditch (7+75 to 11 +00)
Trapezoidal Riprap Channel Inputs:
Material: Riprap
Bottom Left Right
w/o Freeboard w/ Freeboard
Design Discharge:
6.64 cfs
Depth:
0.18 ft 1.18 ft
Top Width:
12.72 ft 16.72 ft
Velocity:
2.97 fps
X -Section Area:
2.23 sq ft
Hydraulic Radius:
0.174 ft
Froude Number:
1.25
Structure #6 (Riprap Channel)
South Ditch (7+75 to 11 +00)
Trapezoidal Riprap Channel Inputs:
Material: Riprap
Bottom Left Right
Freeboard Freeboard Freeboard
Width (ft) Sideslope Sideslope Slope (%)
Ratio Ratio
De pth (ft) % of Depth Mult. x (VxD)
12.00 2.0:1 2.0:1 10.0
1.00
Riprap Channel Results:
PADER Method - Steep Slope Design
Filename: Pond NHN-002 DESIGN 10YR EVENT_05.10.18.sc4 Printed 05-10-2018
Appendix 2.05.3(4)-9 Page 10 March 2018 (TR -16)
w/o Freeboard w/ Freeboard
Design Discharge:
7.68 cfs
Depth:
0.18 ft 1.18 ft
Top Width:
12.74 ft 16.74 ft
Velocity:
3.38 fps
X -Section Area:
2.27 sq ft
Hydraulic Radius:
0.177 ft
Filename: Pond NHN-002 DESIGN 10YR EVENT_05.10.18.sc4 Printed 05-10-2018
Appendix 2.05.3(4)-9 Page 10 March 2018 (TR -16)