PERMFILE58809

• Permit No: C1981012
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 19 POSTMINING DRAINAGE CALCULATIONS 10/23/97
• Media Type: D
• Archive: No

Steep Slope Design - Simons/OSM Method
Design Bottom Manning's
Discharge Width ZLeft ZRight Slope n •
(cfs) (ft) (o)
1D8.20 8.0 3.0:1 3.0:1 1.6 0.039
Top Hydraulic Froude
Depth Velocity Width Radius Number
(ft) (fps) (ft)
-----------------------------------------------
-----------------------------------------------
0.94 10.70** 13.6 0.726 2.19
w/ Freeboard: 1.24 15.4
** Non-uniform flow - Velocity shown is V=Q/A and may not be applicable
----DMaX----
(ft) (in)
1.25 15.00
----D50----
(ft) (in)
1.00 12.00
----D10----
(ft) (in)
0.33 4.00
Runoff Peak
Volume Discharge
(ac-ft) (cfs)
-----------------------------
-----------------------------
IN/OUT 12.76 108.20
J2, B2, S1
UNDIST, RECLAIM:DI4A
Drainage Area from J2, B2, S1, SWS(s)1-3: 24.1 acres
Total Contributing Drainage Area: 24.1 acres
MATERIAL: Rock Riprap
Trapezoidal Riprap Channel
Steep Slope Design - Simons/OSM Method
Design Bottom Manning's
Discharge Width ZLeft ZRight Slope n
(cfs) (ft) (~)
-------------------------------------------------
--------------------------------------------------
47.65 8.0 3.0:1 3.0:1 19.0 0.039
L'epth Velocity
(ft) (fps)
-----------------
0.36 14.40**
w/ Freeboard: 0.66
Top Hydraulic Froude
Width Radius Number
(ft)
10.2 0.321 4.45
12.0
** Nori-uniform flow - Velocity shown is V=Q/A and may not be applicable
----DMax----
(ft) (in)
----D50----
(ft) (in)
----D10----
(ft) (in)
•
1.25 15.00 1.00 12.00 0.33 4.00