2012-06-28_PERMIT FILE - M2012032 ‎(21)‎

• Permit No: M2012032
• IBM Index Class Name: PERMIT FILE
• Doc Date: 6/28/2012
• Doc Name: Appendix 6 & 7
• Media Type: D
• Archive: No

10 -Yr 24 -hr Event
Graphical Peak Discharge
Project: SWB -7 By: B Langenfeld Date: 05/23/12
Location: Revenue Mine Checked: Date:
Developed
1. Data:
Drainage area: .................... A = 14.4310Acres
Runoff Curve Number: ............. CN = 87
Time of Concentration: ........... Tc = 0.04
Storm Type :....................... = II
Pond and swamp areas spread
10 -Yr 24 -hr Event
Runoff Curve Number and Runoff
Project: SWB -8 By: B Langenfeld Date: 05/23/12
Location: Revenue Mine Checked: Date:
Developed
1. Runoff Curve Number (CN)
Cover description CN Soil Group Area(Acre)
Mined Land, Disturbed (Poor) 87 C 1.563
CN (weighted): 87.0
Total Area: 1.563 Acre
2. Runoff
Return Period: 10 -Year
Rainfall, P: 2.20 in
Runoff, Q: 1.0645 in
Runoff Volume: 0.1386 Acre -Ft
Revenue Mine August 2012 6 -6
throughout watershed ............... =
0.00 percent of A
0.0000 Acres
2.
Frequency ........................yr
=
10
3.
Rainfall ,P(24 - hour) ..............
in =
2.20
4.
Initial abstraction, Ia............
=
0.2989
5.
Compute Ia /P .......................
=
0.1358
6.
Unit peak discharge, qu
...... csm /in =
991.04
7.
Runoff ,Q .........................in
=
1.0645
8.
Pond & swap adjustment
factor .... Fp =
1.00
9.
Peak Discharge,gp ...............cfs
=
23.7875
10 -Yr 24 -hr Event
Runoff Curve Number and Runoff
Project: SWB -8 By: B Langenfeld Date: 05/23/12
Location: Revenue Mine Checked: Date:
Developed
1. Runoff Curve Number (CN)
Cover description CN Soil Group Area(Acre)
Mined Land, Disturbed (Poor) 87 C 1.563
CN (weighted): 87.0
Total Area: 1.563 Acre
2. Runoff
Return Period: 10 -Year
Rainfall, P: 2.20 in
Runoff, Q: 1.0645 in
Runoff Volume: 0.1386 Acre -Ft
Revenue Mine August 2012 6 -6