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I <br /> � f <br /> 5 <br /> • Build a temporary dike, if necessary, to the down slope side of the <br /> structure to prevent bypass flow. <br /> Block and Grar,el Filter- A barrier formed around the storm drain inlet <br /> with standard concrete blocks and gravel. See Figure 4.2.8. <br /> • Provide a height of 1 to 2 feet above inlet. <br /> it <br /> f Recess the first row 2-inches into the ground for stability. <br /> I <br /> Support subsequent courses by placing a 2A through the block <br /> opening. <br /> • Do not use mortar. <br /> E <br /> • Lay some blocks in the bottom row on their side for dewaterir�g the <br />¢ pool. <br /> Place hardware cloth or comparable wire mesh with '/-inch openings <br /> over all block openings. <br /> is Place gravel just below the top of blocks on slopes of 2H:1V or flatter. <br /> • An alternative design is a gravel donut. <br /> A Provide an inlet slope of 3H:IV. <br /> Provide an outlet slope of 2H:IV. <br /> Provide al-foot wide level stone area between the structure and the <br /> • inlet. <br /> E Use inlet slope stones 3 inches in diameter or larger. <br />#:. Use gravel '/2- to 3/4-inch at a minimum thickness of l-foot for the <br /> outlet slope. <br /> E <br />' 3 <br />[ I <br /> E <br /> E: <br /> i; <br /> F <br /> is <br /> I. <br /> IIe � r <br /> f: <br /> k <br /> r <br /> e <br /> ljolunte II—Construction Stornnl,ater Pollution Prevention -August 2012 <br /> p. <br /> 4-81 <br /> 1 <br /> 1. <br />