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and a minimum depth of 0.5 feet on a 1 percent slope. The water bar, as <br />• designed, is capable of conveying .75 cfs with .3 feet freeboard and have an <br />outslope velocity of 1.11 feet per second (fps) (see Appendix 2.05.3-4 for <br />calculations). Sun Coal Company, pursuant to the approved haul road decom- <br />mission plan (TR-O1), and in order to facilitate vehicular travel, modified the <br />water bar configuration such that the water bar top width is 15 feet having a <br />minimum depth of 0.5 feet. <br />According to Kaufman (1977), when flow velocities are between 2 to 5 fps <br />and/or when the (outslope) slope embankment is over 10 percent, it should be <br />riprapped. In all cases, where cross drains were proposed, the embankment <br />outslope exceeds 10 percent. If erosion occurs at the base of any cross drain, <br />Sun Coal Company will adopt appropriate erosion control mitigation techniques. <br />• <br /> <br />- 179 - (Rev. 5/861 <br />