PERMFILE69474

• Permit No: C1994082A
• IBM Index Class Name: Permit File
• Doc Date: 9/27/2007
• Doc Name: Drainage and Sediment Control Plan
• Section_Exhibit Name: Tab 13 Attachment 13-12
• Media Type: D
• Archive: Yes

Fe~rnary 1999 Yoart Mime * 13-12 Drainage and Sedsmcnt ComtrolP/an I i
TABLE OF CONTENTS
Section
Page No.
1.0 INTRODUCTION ...............................
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2.0 HYDROLOGIC CALCULATIONS ...........................................................
2.1 Precipitation Distribution .....................................................................
2.2 Storm Duration ......................................................................................
2.3 Retum Period/Precipitation ................................................................
2.4 Hydrograph Response Shape ...............................................................
2.5 Drainage Basin Area ...............................................................................
2.6 Time of Concentration, T~ ....................................................................
2.7 Muskingum Routing Parameters, K, X ...............................................
2.8 Curoe Number, CN ...............................................................................
3.0 SEDIMENTATION CALCULATIONS ....................................................
3.1 Rainfall Factor, R ....................................................................................
3.2 Soil Erodibiliry Factor, K ......................................................................
3.3 Length-Slope Factor, LS ........................................................................
3.4 Control Factor, C ....................................................................................
3.5 Practice Factor, P ....................................................................................
3.6 Sediment Pazticle Distribution .............................................................
4.0 PONDS ..................................................................................................................
5.0 DITCH AND CULVERT DESIGN ................
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6.0 POST MINING CHANNELS ......................................................................................................... 7
6.1 Vegetated Channel Design ..............................................................................................7A
6.2 Rock Riprap Channel Design .........................................................................................7B
6.3 Turf Reinforcement Mat Channel Design .................................................................. 7B
7.0 TOPSOIL STOCIG'ILE SAE
8.0 STOCHI'OND DESIGN..
9.0 REFERENCES .......................................
....................................................................... 9

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Montgomery Wahon Miming Grout' * 765 S. Umiam Boulevard, Suite 460 * Lakewaor~ Colorado 80228 * [phone]
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TR-30 Revised 03/07