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• 2.05.3(4)(a)(ii) <br />The erosion control matting selected for this application is <br />Enkamat 7010. Channel linings are selected to withstand shear <br />stress in the channel. According to the manufacturers published <br />information, Enkamat 7010 is capable of resisting 6 pounds per <br />square foot of shear (tractive) stress. The basic formula to <br />determine shear stress of a channel is unit weight of water X slope <br />of channel X depth of flow. <br />The shear force developed in the upper diversion ditch at a ten and <br />fifteen percent grade is about 2 and 3 pounds per square foot <br />respectively. Therefore, the Enkamat 7010, which can resist a <br />shear stress of 6 pounds per square foot will be installed in the <br />ditch at locations where the ditch grade exceeds 4$. Additionally, <br />the Operator will assure the ditch was constructed in accordance <br />with the approved design, make modifications to the ditch as <br />necessary, and will supply the Division with a P.E. construction <br />certification. <br />• <br />• <br />-101- Rev. March 25, 1995 <br />