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

APPENDIX 6 - STORMWATER CALCULATIONS AND DESIGNS
SWB -1
Graphical Peak Discharge
Project: SWB -1
Location: Revenue
Developed
1. Data:
Drainage area: .................... A
Runoff Curve Number: ............. CN
Time of Concentration: ........... Tc
Storm Type :.......................
Pond and swamp areas spread
throughout watershed ...............
2. Frequency ........................yr
3. Rainfall ,P(24 - hour) .............. in
4. Initial abstraction, Ia............
5. Compute Ia /P .......................
6. Unit peak discharge, qu ...... csm /in
7. Runoff ,Q .........................in
8. Pond & swap adjustment factor .... Fp
9. Peak Discharge,gp ...............cfs
SWB -2
By: B Langenfeld Date: 05/23/12
Checked: Date:
17.9530Acres
70
0.25
II
0.00 percent of A
0.0000 Acres
100
3.30
0.8571
0.2597
655.74
0.8869
1.00
16.3142
Graphical Peak Discharge
Project: SWB -2 By: B Langenfeld Date: 05/23/12
Location: Revenue Checked: Date:
Developed
1. Data:
Drainage area: .................... A = 1.8430Acres
Runoff Curve Number: ............. CN = 74
Time of Concentration: ........... Tc = 0.03
Storm Type :....................... = II
Pond and swamp areas spread
Revenue Mine August 2012 6 -1
throughout watershed ............... =
0.00 percent of A
0.0000 Acres
2.
Frequency ........................yr
=
100
3.
Rainfall ,P(24 - hour) ..............
in =
2.20
4.
Initial abstraction, Ia............
=
0.7027
5.
Compute Ia /P .......................
=
0.3194
6.
Unit peak discharge, qu
...... csm /in =
930.59
7.
Runoff ,Q .........................in
=
0.4474
8.
Pond & swap adjustment
factor .... Fp =
1.00
9.
Peak Discharge,gp ...............cfs
=
1.1990
Revenue Mine August 2012 6 -1