2008-12-11_PERMIT FILE - C1980007A ‎(22)‎

• 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-2R
• Media Type: D
• Archive: Yes

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11
Structure #58 (Vegetated Channel
D2-6E
Structure Detail:
Triangular Vegetated Channel Inputs:
Material: Grass mixture
Left Right Retardance Freeboard Freeboard Freeboard Limiting
Sideslope Sideslope Slope (%) Gasses Mult. x Velocity
Ratio Ratio Depth (ft) % of Depth (VxD) (fps)
2.0:1 2.0:1 22.2 D, B 0.30 5.0
Vegetated Channel Results:

Stability
Class D w/o
Freeboard Stability
Class D w/
Freeboard Capacity
Class B w/o
Freeboard Capacity
Class B w/
Freeboard
Design Discharge: 0.51 cfs 0.51 cfs
Depth: 0.32 ft 0.62 ft 0.56 ft 0.86 ft
Top Width: 1.30 ft 2.50 ft 2.26 ft 3.46 ft
Velocity: 2.40 fps 0.80 fps
X-Section Area: 0.21 sq ft 0.64 sq ft
Hydraulic Radius: 0.145 ft 0.253 ft
Froude Number: 1.05 0.26
Roughness
Coefficient: 0.0804 0.3517
Structure #68 (Erodible Channe/)
D2-6F
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)
1.0:1 2.0:1 13.2 0.0300 0.30 5.5
Erodible Channel Results:
•
w/o Freeboard w/ Freeboard
Design Discharge: 0.97 cfs
Depth: 0.36 ft 0.66 ft
Top Width: 1.07 ft 1.97 ft
Velocity: 5.06 fps
Filename: MB-2R.sc4 Printed 10-23-2008