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Channel Designs <br />The sucfacc water diversion dimensions were determined using blanniags Equation for open channel tlocv. All <br />channels will he either gravel- or vegetated-lined channels. If Elow velocities exceed 6 feet per second, the channels <br />will be lined with riprap or erosion will he controlled with the use of rock check dams. Channels will be designed <br />with a 0.3 toot treeboani. For channels where cock check dams or straw bales are installed, a I toot frccboard was <br />added to the design depth. The Elk Creek postmine channel will also be designed with a I toot frccboard. Riprap <br />sizes were determined using Parfet, OSbI or limiting velocity methods. Given the uncertainty in determining riprap <br />sizes foe steep grades, a factor of safety of 3 inches was added to the riprap Dso designed using the Pader method. <br />The limiting velocities were determined from the "Erosion and Sediment Pollution Control Program Jlanual", <br />Bureau of Land and ~t'ater Conservation, Pennsylvania. The limiting velocities are shown in the channel design <br />section. The Elk Creek channel was designed using the Simons/OSM method, which includes abuilt-in factor-of- <br />safety. Ripcap will consist of durable rock resistant to weathering with a uniform gradation- <br />This section contains design calculations for the following ditches: <br />Elk Creek b4ine and D-Seam Portal Ditches <br />Yard Ditches 1 and 2 <br />Berm Ditch <br />Refuse llitches <br />Haul Road Ditch <br />Conveyor 1 A Ditch <br />East Clean Water Ditch <br />West Refuse Pile Diversion <br />West Refuse Ditch <br />East Rcfusc Ditch <br />6'lk Creek Mine Ditches D1, D2, D3 Upper, D3 Lower, D4, DS Upper, DS Middle, <br />DS Lower, D6, D7, D8 Upper & D8 Lower, D9 and D10. <br />Topsoil Pile Downdrain <br />Hubbard Creek Fansite Ditches HCD-1, HCD-2, HCD-4 <br />In addition, this section contains the desi}m cnlculacion for the following posnnine temporary and permanent <br />ditches snd channels: <br />Substation :~ Chnnncls <br />SS-l, SS-2, SS-3, & S$-4 <br />