Laserfiche WebLink
I <br />Design Criteria <br />Sedimentation ponds are designed to contain all runoff from a 10 year 24 <br />hour storm of 1.8" plus an accumulation of 3 years of sediment for a mini- <br />mum of 24 hours. <br />Spillways will discharge peak runoff from a 25 year 24 hour storm of 2.1 <br />inches and maintain a minimum of 1 ft. of freeboard. <br />All ditches will safely pass the peak flow from a 10 year 24 hour storm. <br />Riprap will be added as necessary to control erosion. The maximum velocity <br />allowed without riprap will be 4 FPS. <br />n <br />U <br />• <br />