2011-11-30_PERMIT FILE - C1981008A

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 11/30/2011
• Doc Name: Collection/Diversion Ditches and Culverts Design Parameters
• Section_Exhibit Name: Section 2.05.3‎(3)‎ Attachment 2.05.3‎(3)‎-1
• Media Type: D
• Archive: Yes

DITCH C27
Time of Concentration (SCS Method)
Project: Pond 015 Drainage By: R. L. Gubka
Location: New Horizon Mine Checked:
Present
Curve Number: 79
Length of Flow: 1963.63 ft
Average Land Slope: 6.50 %
Time of Concentration: 0.368 hrs, 22.1 mins
Date: 08/22/11
Date:
DITCH C27
Graphical Peak Discharge
Project: Pond 015 Drainage By: R. L. Gubka Date: 08/22/11
Location: New Horizon Mine Checked: Date:
Present
1. Data:
Drainage area: .................... A = 6.1630 Acres
Runoff Curve Number: ............. CN = 79
Time of Concentration: ........... Tc = 0.37
Storm Type: ....................... = II
Pond and swamp areas spread
throughout watershed ............... = 0.00 percent of A
0.0000 Acres
2. Frequency ........................yr = 100
3. Rainfall, P(24- hour) ..............in = 3.00
4. Initial abstraction, la............ = 0.5316
5. Compute la /P ....................... = 0.1772
6. Unit peak discharge, qu ...... csm /in = 583.89
7. Runoff ,Q .........................in = 1.1885
8. Pond & swap adjustment factor .... Fp = 1.00
9. Peak Discharge,gp ...............cfs = 6.6823
Revised Aug 2011 JR-60) Attachment 2.05.3(3) -1 -46