2010-12-08_PERMIT FILE - C1981008A ‎(54)‎

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 12/8/2010
• Doc Name: Pond 011 As-Built SedCad & SurvCad Hydrology Calculation for 10yr-24hr & 25yr-24Hr Events
• Section_Exhibit Name: Section 2.05.3‎(3)‎ Attachment 2.05.3‎(3)‎-14
• Media Type: D
• Archive: Yes

Curve Number: 80
Length of Flow: 2231.07 ft
Average Land Slope: 2.03 %
Time of Concentration: 0.706 hrs, 42.4 mins
Graphical Peak Discharge
Basin 011A
Location: New Horizon Mine
Developed
1. Data:
Drainage area: .................... A = 25.5063 Acres
Runoff Curve Number: ............. CN = 80
Time of Concentration: ........... Tc = 0.65
Storm Type: ....................... =11
Pond and swamp areas spread
throughout watershed ............... = 0.00 percent of A
0.0000 Acres
2. Frequency ........................yr = 10
3. Rainfall ,P(24 - hour) .............. in = 2.00
4. Initial abstraction, la............ = 0.5000
5. Compute la /P ....................... = 0.2500
6. Unit peak discharge, qu ...... csm/in = 402.61
7. Runoff, Q .........................in = 0.5625
8. Pond & swap adjustment factor .... Fp = 1.00
9. Peak Discharge,gp ...............cfs = 9.0256
Basin 0116
Location: New Horizon Mine
Developed
1. Data:
Drainage area: .................... A = 101.9003 Acres
Runoff Curve Number: ............. CN = 80
Time of Concentration: ........... Tc = 0.71
Storm Type: ....................... =11
Pond and swamp areas spread
throughout watershed ............... = 0.00 percent of A
0.0000 Acres
2. Frequency ........................yr = 10
3. Rainfall ,P(24 - hour) .............. in = 2.00
4. Initial abstraction, la............ = 0.5000
5. Compute la /P ....................... = 0.2500
6. Unit peak discharge, qu ...... csm/in = 383.43
7. Runoff, Q .........................in = 0.5625
8. Pond & swap adjustment factor .... Fp = 1.00
9. Peak Discharge,gp ...............cfs = 34.3402
Revised January 2010 (PR06) Attachment 2.05.3(3) -14 -4