2008-12-04_PERMIT FILE - C1994082A ‎(4)‎

• Permit No: C1994082A
• IBM Index Class Name: Permit File
• Doc Date: 12/4/2008
• Doc Name: Drainage and Sediment Control Plan
• Section_Exhibit Name: Tab 13 Attachment 13-12
• Media Type: D
• Archive: Yes

February 1999 Yoa.rtMine * 13-12 Drainage and Sediment Control Plan • i
TABLE OF CONTENTS
Section
Page No.
1.0 INTRODUCTION ...............................................................................................................................1
2.0 HYDROLOGIC CALCULATIONS ...............................................................:...............................1
2.1 Precipitation Distribution ........................................................................................................ 2
2.2 Storm Duration ......................................................................................................................... 2
2.3 Return Period/Precipitation ................................................................................................... 2
2.4 Hpdrograph Response Shape .................................................................................................. 2
2.5 Drainage Basin Area ................................................................................................................. 2
2.6 Time of Concentration, T~ ...................................................................................................... 2
...................
2.7 1~Iuskingum Routing Parameters, K, X .............................
2.8 Curve Number, CN .................................................................................................................. 3
3.0 SEDIMENTATION CALCULATIONS ......................................................................................3
3.1 Rainfall Factor, R ...................................................................................................................... 3
3.2 Soil Erodibility Factor, K ........................................................................................................ 3
3.3 Length-Slope Factor, LS ..........................................................................................................3
3.4 Control Factor, C ...................................................................................................................... 3
3.5 Practice Factor, P ...................................................................................................................... 6
3.6 Sediment Particle Distribution ............................................................................................... 6
4.0 PONDS ....................................................................................................................................................7
5.0 DITCH AND CULVERT DESIGN ............................................................................................... 9
6.0 POST MINING CHANNELS .......................................................................................................10
6.1 Ve etated Channel Desi .........................10
g gn ......................................................................
6.2 Rock Riprap Channel Design ...........................................................................................11
6.3 Turf Reinforcement Mat Channel Design ...................................................................12
7.0 TOPSOIL STOCKPILE SAE .........................................................................................................14
8.0 STOCKPOND DESIGN ...:..............................................................................................................14
9.0 REFERENCES ...................................................................................................................................15
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Montgomery Watson Mining Group * 165 S. Union Boulevard, Suite 460 * Lakewood, Colorado 80228 * [phone]
TR-30 Revised 08/08