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<br />, ~ ' " <br /> <br />Sediment Contrtol <br />InlefPfotec Ion <br /> <br />{8M:l\UJ:':ilUl'l(/iJ\ <br /> <br />SA!t[iaAGSm <br />OI'!:RlAP GNTO CURB <br /> <br />1 <br /> <br />rCUR5INiIl <br /> <br />BAC,Of <br />CuRfi <br /> <br /> <br />SPIUI'IAY_ <br /> <br />CURB INLET SAND BAG BARRIER <br />IHi:lINLElPRDfECJIONiSUSWSmIIiEJM(RO_~Di:lPAItD <br />Ji?f:aORCSfR)o91 <br /> <br />Description <br /> <br />Storm drain inlet protection methods prevent sediment from entering <br />storm drainage systems prior to permanent stabilization ofthe dis- <br />turbed area, This can include a sediment filter or an excavated <br />impounding area around a storm drain drop inlet or curb inlet or a <br />geotextile barrier supported around or across a storm drain inlet <br /> <br />These methods reduce the rate at which sediment -laden water may <br />enter an inlet thereby causing ponding and settling of sediment This <br />will keep sediment from being transported to lakes or streams and <br />can also prevent clogging of the storm sewer caused by heavy <br />sediment loads, <br /> <br />Storm drain inlet protection is only as effective as the filter or barrier <br />used around the inlet Effectiveness decreases rapidly if the inlet <br />protection is not properly maintained, <br /> <br />Storm drain inlet protection provides relatively good removal of <br />coarse and medium-size sediment from runoff, However, most fine <br />silt and clay particles will pass though gravel filters on these struc- <br />tures, <br /> <br />Advantages <br /> <br />Storm drain inlet protection will reduce the amount of sediment <br />leaving a construction site. <br /> <br />Inlet protection is inexpensive and easy to construct <br /> <br />Limitations <br /> <br />Properly maintaining inlet protection is difficult and often inlets <br />become clogged causing erosion elsewhere. <br /> <br />Inlet protection devices are generally not very effective at <br />filtering fine-grained sediment or large loads of sediment <br /> <br />Metropolitan Council! Barr Engineering Co. <br /> <br />1- <br /> <br />Purpose <br /> <br />Water Quantity <br />Flow attenuation 0 <br />Runoffvolume reduction 0 <br />Water Quality <br /> <br />Pollution prevention <br />Soil erosion . <br />Sediment control . <br />Nutrient loading IJ <br />Pollutant removal <br />Total suspended sediment (TSS) . <br />Total phosphorus (P) (] <br />Nitrogen (N) (] <br />Heavy metals IJ <br />Floatables 0 <br />Oil and grease 0 <br />Other <br />Fecal coliform 0 <br />Biochemical oxygen demand IJ <br />(BOD) <br />. Primary design benefit <br />IJ Secondary design benefit <br />o Little or no design benefit <br /> <br />3-113 <br />