PERMFILE41923

• Permit No: C1982057A
• IBM Index Class Name: Permit File
• Doc Date: 10/4/2002
• Doc Name: Drainage and Sediment Control Plan
• Section_Exhibit Name: Tab 13 Attachment 13-5B
• Media Type: D
• Archive: Yes

Septembn 1998 - " ~Senera I/W South Expansion ` Drunage and Sediment Contra! Plan ~ ii -
TABLE OF CONTENTS ~
• Section Page No.
1.0 INTRODUCTION .......:.......................................................:................... ..................... 1
2.0 HYDROLOGIC CALCULr1TIONS ...................................................... ..................... 1
2.1 Precipitation Distribution .............................................................. ..................... 1•
2.2 Storm Duration ............................................................................. ..................... 2
2.3 Return Period/Precipitation ..............................:.......................:... ....................: 2
2.4 Hydrograph Response Shape ......................................................... ..................... 2
2.5 Drainage Basin Area ......:..........................................:.................... ..................... 2
2.6
Time of Concentration'T~ ............................................................ ..................... 2
.
2.7 Muskingum Routing Pazameters, K, X ...:........................:............. ..................... 2
2.8 Curve Number, CN ............:............:.............................:.............: ..:...........:...... 2
3.0 SEDIMENTATION CALCULATIONS .:............................................... ..................... 3
3.1 Rainfall Factor, R ............................................:............................. ..................... 3
3.2 Soil Erodibility Factor, K .............................................................. ...........:......... 3
3.3 Length-Slope Factor, LS :.............................................................:.
.
..................... 4
3.4 Control Factor, C ................................................................:......... ..................... 4
3.5 Practice Factor, P ....:...................................................................... ..................... 4
3.6 Sediment Particle Distribution ....................................................... ..................... 5
• 4.0 PONDS ........:............................................................................................. .....................5
5.0 ..HAUL ROAD CHANNEL AND CULVERT DESIGNS .........:...:....... ..................... 5
6'.0 POST MIMING CHANNELS ..:...........................................................:... :........:........... 6
7.0 REFERENCES ..........................:...................:........:.................................. ...:................. 7
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Montgomery Watson Mining Croup • 165 5. Union Bauleoard, Suite 460 • [akemood, Colorado 80118 •(970J 7635140
Revised 1(99