PERMFILE52028

• Permit No: C1981020A
• IBM Index Class Name: Permit File
• Doc Date: 5/13/2002
• Section_Exhibit Name: Appendix M‎(i)‎ to M‎(viiI)‎
• Media Type: D
• Archive: Yes

• e) Diversion Channel Design
Problem: Determine hydraulic data for the diversion channels to
be located above the waste rock disposal site.
Assumptions: a) Type 11 Storm
b) CN = ~0
o> AMC II
Snlnfinne
i) Peak Discharge for the diversion channels shall be calculated
using Figure D-2 from "Peak Flows in Colorado" - SCS.
Drainage Area I (Ad = 6ac)
From Figure ~-2
For ~'~ = 6ac, Peak Discharge is 11 CFS71i~ of runoff
• ForC?I=30, 910=9.391N
0
0 0 410 = 11 CFS71N X 0,3~ IN = 4.29 CFS.
Drainage Area II (.Ad = 12ac)
From Figure I)-2
For A = 12 ac, Peak Discharge is 19 CFS71N of runoff
For CPS = u0,.~l0 = 0.39 IN.
0
0 0 410 19 CFS71N X 0.39 IN = 7.41 CFS
Use Table E-1 - - Slope adjustment factors by drainage areas
For 50~ slope and 6ac the slope adjustment factor is 1,14
For 50~ slope and 12ac the slope adjustment factor is1.13
0
• o o Q10 = 4.29 cFS x 1.14 = 4,39 cFS (.4d = Sac)
glo = 7.41 cFS x 2.7_~ = 3.7!I cFS (ad = 12 ac)