2008-12-11_PERMIT FILE - C1980007A ‎(35)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2008
• Doc Name: 25 Year, 24 Hour Surface Water Control Plan
• Section_Exhibit Name: Exhibit 66 Pond MB-3
• Media Type: D
• Archive: Yes

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Structure Detail.,
Structure #21 (Erod/b/e Channel
D3-2A
Triangular Erodible Channel Inputs:
Material: Graded silts to cobbles when colloidal
Left Right Freeboard Freeboard Freeboard Limiting
Sideslope Sideslope Slope (%) Manning's n Mult. x Velocity
Ratio Ratio Depth (ft) % of Depth (VxD) (fps)
2.0:1 2.0:1 6.0 0.0300 0.30 5.5
Erodible Channel Results:
•
w/o Freeboard w/ Freeboard
Design Discharge: 2.10 cfs
Depth: 0.49 ft 0.79 ft
Top Width: 1.95 ft 3.15 ft
Velocity: 4.41 fps
X-Section Area: 0.48 sq ft
Hydraulic Radius: 0.218 ft
Froude Number: 1.57
Structure #20 (Cu/vent)
C3-3A
. Culvert Inputs:
Culvert Results:
Max. Tailwater Entrance
Length (ft) Slope (%) Manning's n Headwater (ft) Loss Coef.
(ft) (Ke)
17.90 5.00 0.0240 1.50 0.00 0.91
Design Discharge = 2.10 cfs
Minimum pipe diameter: 1 - 10 inch pipe(s) required
Structure #24 (Erodible Channe/)
D3-4A
Triangular Erodible Channel Inputs:
Material: Graded silts to cobbles when colloidal
Filename: MB-3.sc4 Printed 10-21-2008