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Chapter 4-Site-Specific Oustrial Storm Water BMPs <br />Storm `Drain"{nlet Protection <br />What Is It <br />Storm drain inlet protection is a filtering measure placed around any inlet or drain to trap sediment. <br />This mechanism prevents the sediment from entering inlet structures. Additionally, it serves to <br />prevent the silting-in of inlets, storm drainage systems, or receiving channels. Inlet protection may <br />be composed of gravel and stone with a wire mesh filter, block and gravel, filter fabric, or sod. <br />Sod Inlet Protection <br />Flow FiOw <br />i <br />Flow <br />Flow <br />Excavated Gravel Inlet Protection <br />• EMBANKMENT <br />t <br />?M?ayJ .c? <br />Fitter Fabric. \. <br />Filter Fabric Inlet Protection Block and Gravel Inlet Protection <br />FIGURE 4.24 EXAMPLES OF STORM DRAIN INLET PROTECTION <br />from State of North Carolina, 1988; Washington State, 1992;.and County of Fai <br />987) <br />When and Where to Use It <br />This type of protection is appropriate for small drainage areas where storm drain inlets will be ready <br />for use before final stabilization. Storm drain inlet protection is also used where a permanent storm <br />drain structure is being constructed onsite. Straw bales are not recommended for this purpose. <br />Filter fabric is used for inlet protection when storm water flows are relatively small with low <br />velocities. This practice cannot be used where inlets are paved because the filter fabric should be <br />staked. Block and gravel filters car, be used where velocities are higher. Gravel and mesh filters <br />• <br />11 <br />• <br />4-84 <br />Droo Inlet <br />with Grate <br />Stakes