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Chapter 4 - BestMana ement Practices for Erosion and Sediment Control <br />4.OS STORM DRAIN INLET PROTECTION <br />{ES SMP 1.(18) <br />Definition <br />A sediment filter or an excavated impounding area around a storm drain drop inlet or curb <br />inlet. <br />Pur ose <br />To prevent sediment from entering storm water conveyance systems prior to permanent <br />stabilization of the disturbed area. <br />Condition Where Practice Apwlies <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 />Plannina Considerations. <br />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 upas site coxiditioosnencouraged, s and type of rbut onlet nly after specific ther innovative and <br />for accomplishing the same puree are <br />" details are submitted to.and approved by the stommwater 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 />ow <br />Desig_ n r9a <br />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 is <br />of trapped sediment and to minimize interference with construction activities. <br />3. The inlet protection devices shall be constructed so that any resultant ponding. or <br />stormwaterwiil not cause excessive inconvenience or damage to adjacent areas or <br />structures. <br />4. Design criteria more specificto each particularinlet protection devices will befound <br />on Plates 4.08a -h. <br />M <br />