Laserfiche WebLink
Chapter 4-Site-Specific Industriftorm Water BMPs <br />hat to Consider • <br />W <br />F- The dams <br />Check dams should be used only in small open channels that rain 10 acres or <br />orities) less The center <br />should not be placed in streams (unless approved by appropriate <br />downstream darned so that the toe <br />the top of Dams should be <br />section of the check dam should be lower than the eges. <br />of the upstream dam is at the same elevation as and After each significant rainfall, check dams when it reaches onerhalfthe originaldarm height. <br />accumulation. Sediment should be ction <br />com Check for erosion at edges and repair promtly atatve as require. controls will beuused as a pepmane tl ' <br />stone and riprap should be removed 9e <br />erosion control measure. It will be important <br />Conta t the State local storm wateow <br />is to beknst lied. expect <br />rate for the swale in which this measure <br />program agency or a licensed engineer for assistance in designing this measure. <br />Advantages of Check Dams <br />• Are inexpensive and easy to install <br />• May be used permanently if designed properly <br />• Allow a high proportion of sediment in the runoff to settle out <br />• Reduce velocity and provide aeration of the water <br />• May be used where it is not possible to divert the flow or otherwise stabilize the c. <br />Disadvantages of Check Dams- <br />• May kill grass linings in channels if the water level remains high after it rains or if thersignificant sedimentation <br />• Are useful only for drainage areas of 10 acres or less <br />E <br />4-94