PERMFILE102806

• Permit No: C1981032
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Diversion Ditch and Sediment
• Section_Exhibit Name: CHAPTER C MINE OPEATION PLAN Appendix A
• Media Type: D
• Archive: No

RUNOFF L`I DISTURBED AREA
BASIN LD
•
BASIN AREA Loif Lch Tc
LD .022 200 1,450 .10
EVENT PEAK FLOW VOL RUNOF F
10 9.8 .54
25 . 14.8 .81
100 22.9 1.25
SEDIMENT VOLUM E BY U.S. L.E.
A = R x K x LS x C
R = 30
K = .24
C = 1.0 NO COVER
LS FOR MULTIPLE SLOPES
~• '
11 = 250 S1 = .38 m = .6 L1 = 2.1
12 = 160' S2 = .04 m = .5 L2 = 1.48
~m
Ln = (72.6
Sn = 650+454s+65s2
l0,OD0 + S2
((L1S1) ~1 - (LOST) ~) + ((L2S2) ~2 - (L1S2) ~,1)
Ls =
11 + 12
S1 = 9.77 ~1 = 250
S2 = .35 ~2 = 410
~ _ ((2.1)(9.77) 250 - 0) +((1.48)(.35) 410 -(2.1)(.35)(250)) = 12.6
A = 90.7 Tons/Year/Acre = 2.6
Sed. Vol 90.? Tonsl~eL~Yee~x 14.3 Acre x 2000 Lbs
. ~.6 02.4 Lbs~ x 43560 Cu FL/Ac Ft
~~
Sed. Vol/Ye2r = .37 Ac Ft