2001-12-11_PERMIT FILE - C1996084 ‎(9)‎

• Permit No: C1996084
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 15-17 Mine Area P2 SEDIMENT CONTROL POND 2-3
• Media Type: D
• Archive: No

SEDCAD 4 for Windows
CoDYTight 1998 Pamela J. Schwab
Civil Software Design
•
Structure #6 (Pand1
pond
Pond Inputs:
Structure Detai/••
Initial Pool Elev: 6,617.00
Initial Pool: 0.14 ac-ft
'Sediment Storage: 1.73 ac-ft
Dead Space: 20.00

*Sediment capacity based on Average Annual R of 70.0 far 3 year(s)
Perforated Riser
Riser
Riser Height Barrel
Barrel Barrel Slope Number of

'
Diameter (ft) Diameter Len th ft %
g () ( ) s n Spillway Elev Holes per
Manning
(in) (in) Elev
8.00 8.00 ~ 6.00 70.00 1.00 0.0240 6,619.00 2
Pond Results:
•
Peak Elevation: 6,619.76
H'graph Detention Time: 10.54 hrs
Pond Model: CSTRS
Dewater Time: 3.95 days
Trap Efficiency: 80.88
Dewatering time is calculated from peak stage to lowest spillway
Elevation-Capacity-Discharge Table

Elevation Area

(ac) Capacity

(ac-ft) Discharge

(~s) Dewater
Tme
(hrs)
6,616.60 0.330 0.000 0.000 Top of Sed. Storage
6,617.00 0.339 0.135 0.000 Low hole SPW #1
6,617.50 0.350 0.307 0.037 56.09"
6,618.00 0.361 0.485 0.201 10.70•
6,618.50 0.373 0.669 0.274 9.40
6,619.00 0.365 0.858 0.332 7.60 Spillway #1
6,619.50 0.397 1.054 1.035 7.35
6,619.76 0.403 1.158 1.050 3.60 Peak Stage
6,620.00 0.409 1.255 1.063
6,620.50 0.422 1.463 1.090
Filename: New Pond 2-3rev.sc4 Printed 07-24-2001