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Chapter 4-Site-Specific Sustrial Storm Water BMPs • <br />Gravel .or Stone Filter Berm <br />What Is It <br />A gravel or stone filter berm is a temporary ridge constructed of loose gravel, stone, or crushed <br />rock. It slows and filters flow, diverting it from an exposed traffic area. Diversions constructed of <br />compacted soil may be used where there will be little or no construction traffic within the right-of <br />way. They are also used for directing runoff from the right-of-way to a stabilized outlet. <br />Coarse aggregate <br />X111 ={?=11 }.-II(111 I II I I-l?l=?=-II <br />IF I I - - <br />FIGURE 4.23 TYPICAL GRAVEL FILLER BERM <br />(Modified from Commonwealth of Virginia, 1980) <br />When and Where to Use It <br />This method is appropriate where roads and other rights-of-way under construction should <br />accommodate vehicular traffic. Berms are meant for use in areas with shallow slopes. They may <br />also be used at traffic areas within the construction site. <br />What to Consider <br />Berm material should be well graded gravel or crushed rock. The spacing of the berms will depend <br />on the steepness of the slope: berms should be placed closer together as the slope increases. The <br />diversion should be inspected daily, after each rainfall, or if breached by construction or other <br />vehicles. All needed repairs should be performed immediately. Accumulated sediment should be <br />removed and properly disposed of and the filter material replaced, as necessary. <br />• <br />• <br />4-R2