PERMFILE135356

• Permit No: C1994082A
• IBM Index Class Name: Permit File
• Doc Date: 6/15/2006
• Doc Name: Drainage and Sediment Control Plan
• Section_Exhibit Name: Tab 13 Attachment 13-12
• Media Type: D
• Archive: Yes

FeGruary 1999 Yxvrt Mine * 73-12 Drainage anASerk~mext CvntmlPlvn 1 i
TABLE OF CONTENTS
• Section
Paee No.
1.0 INTRODUCTION ......................................................................................... ........................................1
2.0 HYDROLOGIC CALCULATIONS ......................................................... ........................................1
2.1 Precipitation Distribution ................................................................ ........................................ l
2.2 Storm Duration ................................................................................. ........................................2
2.3 Return Period/Precipitanon ........................................
...................
........................................ 2
2.4 Hydrograph Response Shape .......................................................... ........................................ 2
2.5 Drainage Basin Area ......................................................................... ........................................ 2
2.6 Time of Concentration, T~ .............................................................. ........................................2
2.7 Muskingum Routing Parameters, K, X ......................................... ........................................ 2
2.8 Curve Number, CN .......................................................................... ........................................ 2
3.0 SEDIMENTATION CALCULATIONS ................................................... ........................................ 3
3.1 Rainfall Factor, R .............................................................................. ........................................ 3
3.2 Soil Erodibiliry Factor, K ................................................................ ........................................ 3
3.3 Length-Slope Factor, LS .................................................................. ........................................ 4
3.4 Control Factor, C .............................................................................. ........................................4
3.5 Practice Factor, P ......................
3.6 Sediment Particle Distribution
•
•
4.0 PONDS
5.0 DITCH AND CULVERT DESIGN
6.0 POST MINING CHANNELS
7.0 TOPSOIL STOCKPILE SAE ...............
S.0 STOCKI'OND DESIGN
9.0 REFERENCES
............ 4
............ 5
PR-02 Rexi,reA03/03
Montgonxry Watran Mixing Gronp * 165 S. Uniai Bonlevaml, Suite 460 * LokemoaA, ColorvAo 80228 * [phone]