2017-07-18_PERMIT FILE - C1981019A ‎(2)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 7/18/2017
• Doc Name: Sediment Control for Initial Disturbance Coal Stockpile Pond Using Total Containment
• Section_Exhibit Name: Volume 18 Exhibit 7, Item 23 Part M
• Media Type: D
• Archive: Yes

SEDCAD 4 for Windows
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Structure Detail:
Structure #3 (Erodible Channell
dwnstrm edge of disturbed area
Trapezoidal Erodible Channel Inputs:
Material: Shales and hardpans
Bottom Left Right
Freeboard Freeboard Freeboard
Limiting
Width (ft) Sideslope Sideslope Slope (%) Manning's n
Mult. x
Velocity
Ratio Ratio
Depth (ft) % of Depth
p (VxD)
(fps)
20.00 4.0:1 4.0:1 1.0 0.0250
(
6.0
Erodible Channel Results:
Structure #Z (Grass Filterr
nat7 veg area dnstrm of 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) (%)
0.0121 3.0 0.67 0.20 20.000 20.0 300.0 6.E
Grass Filter Results:
Total Infiltration Volume:
w/o Freeboard w/ Freeboard
Design Discharge:
1.09 cfs
Depth:
0.06 ft
Top Width:
20.48 ft
Velocity:
0.90 fps
X -Section Area:
1.21 sq ft
Hydraulic Radius:
0.059 ft
Froude Number:
0.65
Structure #Z (Grass Filterr
nat7 veg area dnstrm of 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) (%)
0.0121 3.0 0.67 0.20 20.000 20.0 300.0 6.E
Grass Filter Results:
Total Infiltration Volume:
0.0279 ac -ft
Filter Infiltration Rate:
0.0278 cfs
Peak Flow Depth:
0.056 in
Critical Prone Velocity:
1.0367 fps
Wedge Location:
0.31 ft
Sediment Depth in Zone D:
0.0891 in
Trap Efficiency:
84.7%
I
Filename: CHR TR111 grass filter.sc4 Printed 06-27-2017
Exh. 7-23M-58 Revision Date: 6/27/2017
Revision No.: TR -1 1 1