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January 2002 Senem IIW South Expanrion * Drainage and Sediment Control P/an • Page 9 <br />• 6.0 POST MINING CHANNELS <br />All post-training channels were designed to safely pass the peak discharge from the 10-yeaz, 24-hour <br />event The post mining channels dimensions were determined using Manning's Equation for open <br />channel flow. All channels will be grassed-lined channels except for then steeper portions, which will <br />require riprap. All hydrology and channel design inputs and results for the South Atea can be <br />found in Tab 20, Attachment 20-1, Postmine Channel Designs. The design results are shown <br />on Figure 20-1,2, Poatmine Channel Designs for South Area. The locations of the channels are <br />shown on Exhibit 20-2, Poshnining Topography and Drainage. <br />• <br />L J <br />PA-0S <br />lievrred 4/06 <br />MI P/I i * 165 S. Union Bau/evanl Snite 410 * Lakeaoor~ Ca/ararla 80228 * (970) 763-5140 <br />