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Portal #1 Reclamation Channel - page 3 <br />HYDRAULICS OF RECLAMATION CHANNEL <br />The existing drainage slope in the vicinity of the reclaimed <br />portal was measured from the available mapping. It was <br />determined that the design slope, to match the existing grade, <br />would be 250. This is a steep channel slope. In order to keep <br />the erosion potential and tractive forces as low as possible in <br />the channel, it was designed with a wide, flat configuration. <br />Table 2 presents the specifics of the channel. <br />Table 2. Reclamation Channel Hydraulics, 25-yr. Capacity <br />Element Portal #1 Channel <br />Flow capacity, cfs 5.1 <br />Channel slope, ft./f t. .25 <br />Cross section shape triangular <br />Side slope, horiz. to vert. 8:1 <br />Depth of flow, ft. .35 <br />Channel top width, ft. 15 ' <br />' flow top width = 5.6 ft., additional width for freeboard <br />The velocity in the channel for the 25-year design discharge is <br />5.2 feet/second. This is a non-erosive velocity for the existing <br />Water 6 Environmental Systems Technology, Inc. April, 1999 <br />