Laserfiche WebLink
+ Chapter 4 - Best Management Practices for Erosion and Sediment Control <br /> 4. 08 STORM DRAIN INLET PROTECTION <br /> (ES BMP 1 . 08 ) <br /> Definition <br /> A sediment filter or an excavated impounding area around a storm drain drop inlet or curb <br /> inlet. <br /> Purpose <br /> i <br /> To prevent sediment from entering storm water conveyance systems prior to permanent <br /> stabilization of the disturbed area . <br /> r <br /> Condition Where Practice Applies <br /> Where storm drain inlets are to be made operational before permanent stabilization of the <br /> disturbed drainage area . Different types of structures are applicable to different conditions <br /> (see Plates 4 . 08a through 4. 08h) . <br /> i <br /> Planning Considerations <br /> i Storm sewers which are made operational before their drainage area is stabilized can <br /> convey large amounts of sediment to receiving waters . In case of extreme sediment <br /> loading , the storm sewer itself may clog and lose most of its capacity. To avoid these <br />+ problems, it is necessary to prevent sediment from entering the system at the inlets . <br /> This section contains several types of inlet filters and traps which have different <br />+ applications dependent upon site conditions and type of inlet. Other innovative techniques <br /> for accomplishing the same purpose are encouraged , but only after specific plans and <br /> details are submitted to and approved by the stormwater permitting agency. <br /> Note that these various inlet protection devices are for drainage areas of less than one <br /> acre (0 .4 ha) . Runoff from large disturbed areas should be routed through a TEMPORARY <br />.. SEDIMENT TRAP - Section 4.25 ( ES BMP 1 .25) . <br /> Design Criteria <br /> w <br /> 1 . The drainage area shall be no greater than 1 acre (0 .4 ha) . <br /> 2 . The inlet protection device shall be constructed to facilitate clean out and disposal <br /> of trapped sediment and to minimize interference with construction activities. <br /> i 3 . The inlet protection devices shall be constructed so that any resultant ponding or <br /> stormwaterwill not cause excessive inconvenience ordamage to adjacent areas or <br /> structures . <br /> 4 . Design criteria more specificto each particular inlet protection devices will be found <br /> on Plates 4 .08a-h . <br /> w <br /> 4-33 <br />