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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 conditioosnencouraged ,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 /> 4-33 <br />