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BMP C220: Storm Drain Inlet Protection <br /> Purpose To prevent coarse sediment from entering drainage systems prior to <br /> permanent stabilization of the disturbed area. <br /> Conditions of Use Where storm drain inlets are to be made operational before permanent <br /> stabilization of the disturbed drainage area. Protection should be provided <br /> for all storm drain inlets downslope and within 500 feet of a disturbed or <br /> construction area, unless the runoff that enters the catch basin will be <br /> conveyed to a sediment pond or trap. Inlet protection may be used <br /> anywhere to protect the drainage system. It is likely that the drainage <br /> system will still require cleaning. <br /> Table 4.9 lists several options for inlet protection. All of the methods for <br /> storm drain inlet protection are prone to plugging and require a high <br /> frequency of maintenance. Drainage areas should be limited to 1 acre or <br /> less. Emergency overflows may be required where stormwater ponding <br /> would cause a hazard. If an emergency overflow is provided, additional <br /> end-of-pipe treatment may be required. <br /> Table 4.9 <br /> Storm Drain Inlet Protetion <br /> Applicable for <br /> Type of Inlet Emergency Paved/Earthen <br /> Protection Overflow Surfaces Conditions of Use <br /> Drop Inlet Protection <br /> Excavated drop inlet Yes, Earthen Applicable for heavy flows. Easy <br /> protection temporary to maintain. Large area <br /> flooding will Requirement: 30'X 30'/acre <br /> occur <br /> Block and gravel drop Yes Paved or Earthen Applicable for heavy concentrated <br /> inlet protection flows. Will not pond. <br /> Gravel and wire drop No Applicable for heavy concentrated <br /> inlet protection flows. Will pond. Can withstand <br /> traffic. <br /> Catch basin filters Yes Paved or Earthen Frequent maintenance required. <br /> Curb Inlet Protection <br /> Curb inlet protection Small capacity Paved Used for sturdy, more compact <br /> with a wooden weir overflow installation. <br /> Block and gravel curb Yes Paved Sturdy, but limited filtration. <br /> inlet protection <br /> Culvert Inlet Protection <br /> Culvert inlet sediment 18 month expected life. <br /> trap <br /> 4-82 Volume II—Construction Stormwater Pollution Prevention February 2005 <br />