2017-09-07_PERMIT FILE - C1981019 ‎(7)‎

• Permit No: C1981019
• IBM Index Class Name: Permit File
• Doc Date: 9/7/2017
• Doc Name: Collom Topsoil Depth Test Small Area Exemption Demonstrations
• Section_Exhibit Name: Volume 18 Exhibit 7 Item 25B
• Media Type: D
• Archive: No

SEDCAD 4 for Windows
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Structure Detail;
Structure #1
Area above Test Pit
Structure #2 (Grass Filter)
Test Pit Disturbance
Grass Filter Inputs:
Stiffness
Roughness Grass Height Hydraulic Infiltration Factor Filter Length Filter Width Filter Slope
Coefficient (in) Spacing (in) Rate (iph) (N -sq m) (ft) (ft) M)
0.0054 6.0 0.86 0.15 0.700 6.0 5.0 5.0
Grass Filter Results:
Total Infiltration Volume:
0.0001 ac -ft
Filter Infiltration Rate:
0.0001 cfs
- - - -Peak Flow Depth:- —
_ 0.047 in
Critical Prone Velocity:
0.7266 fps'
Wedge Location:
0.58 ft
Sediment Depth in Zone D:
0.1766 in
Trap Efficiency:
55.3%
Structure #3 (Null
Null Input
M
Filename: Printed 07-21-2017