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Jmmary 2002 Seneea IIW South Expan.rian * Drainage and ,Sedrmen[ Con[rol Plan 1 Page 9 <br />6.0 POST MINING CHANNELS <br />All post mining channels were designed to safel}' pass the peak discharge from the ]0-year, 24-hour <br />event. The post mining channels dimensions were determined using Manning's Equation fox open <br />channel flow. All channels will be grassed-lined channels except for their steeper portions which will <br />require rip rap. All hydrology and channel design inputs and results can be found in Appendix 3, Posc <br />Mining Channel Designs. Included in this submittal ate revised designs for PM-2 Lower, PM- <br />2A, PM-3 Lower, and PM-4 (new). The design results axe shown on Figure 1, Postmine Channel <br />Designs. The locations of the channels are shown on Exhibit 20-2A,Postmining Topography. <br />Channel profiles fox channels PM-2 Lower and PM-4 are shown Exhibit 20-5.9, Postmining <br />Channel Profiles. <br />MWH * 165 S. Union Boulevard, Surte 410 * Lnkemoad, Colorado 80228 * (970) 763-5140 <br />ucuvto-.,../r,.,.. nu~r..ro/vam/,m~a..a usw.w.,p.e.- Rev 7/02 <br />