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• Support subsequent courses by placing a 2x4 through the block opening. <br /> • Do not use mortar. <br /> • Lay some blocks in the bottom row on their side for dewatering the pool. <br /> • Place hardware cloth or comparable wire mesh with %-inch openings over all <br /> • block openings. <br /> • Place gravel just below the top of blocks on slopes of 2H:1 V or flatter. <br /> • An alternative design is a gravel donut. <br /> • Provide an inlet slope of 3H:1 V. <br /> • Provide an outlet slope of 2H:1V. <br /> • Provide a1-foot wide level stone area between the structure and the inlet. <br /> • Use inlet slope stones 3 inches in diameter or larger. <br /> • Use gravel 1/2- to 3/-inch at a minimum thickness of 1-foot for the outlet slope. <br /> Page 155 <br />