HYDRO24993

• Permit No: C1981035
• IBM Index Class Name: Hydrology
• Doc Name: HYDROLOGIC & HYDRAULIC DESIGN OF SEDIMENTATION PONDS & OTHER DRAINAGE FEATURES FOR NTL KING COAL MI
• Permit Index Doc Type: OTHER SURFACE WATER
• Media Type: D
• Archive: No

Table of Contents
1. Scope and Purpose ...................................... 1
2. Mine Drainage Plan ..................................... 1
2.1 Diversion of Uncontaminated Runoff ......................... 1
2.2 Treatment of Yazd Runoff ............................... 1
3. Drainage Basin Characteristics ............................... 2
3.1 Basin Geometry and Soils ................................ 2
3.2SCSCurveNumber ...................................3
4. Hydrology ........................................... 4
4.1 West Hillside Area .................................... 5
4.2 Peak Discharges and Volumes ............................. 5
5. Drainage Swctures ...................................... 5
5.1 Pipes and Channels .................................... 5
5.2 Yazd Drainage Routed to Ponds ................:........... 6
5.3 Drainage Swcture Summary .............................. 7
5.4 Riprap Design for the Eastside Drainage Channel ................. 8
6. Sediment Ponds ........................................ 9
6.1 Hydrology ......................................... 9
6.2 Watershed Sediment Yield ............................... 11
6.3 Pond Geometry ...................................... 11
6.4 Outlet Works and Trash Rack ............................. 12
7. Topsoil Storage Pile Drainage ............................... 13
~-
June 1995