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Chapter 4 - Best Management Practices for Erosion and Sediment Control <br /> Dike Design <br /> 1 . An earthen dike shall be used to direct stormwater runoff into the temporary slope <br /> ' drain and shall be constructed according to the practice entitled DIVERSION - <br /> Section 5 . 18 (ES BMP 1 . 18) . (See Plate 4 . 30a) <br /> 2 . The height of the dike at the centerline of the inlet shall be equal to the diameter of <br /> the pipe (D) plus 6 inches ( 15 cm) . Where the dike height is greater than 18 inches <br /> (45 cm) at the inlet, it shall be sloped at the rate of 3 : 1 or flatter to connect with the <br /> remainder of the dike . (See Plate 4 . 30a) <br /> Outlet Protection <br /> The outlet of the slope drain shall be protected from erosion according to the practice <br /> entitled OUTLET PROTECTION - Section 5 .36 (ES BMP 1 . 36) . (See Plate 4 .30b) . <br /> Construction Specifications <br /> 1 . The measure shall be placed on undisturbed soil or well-compacted fill . <br /> 2 . The entrance section shall slope toward the slope drain at the minimum rate of <br /> " '/zinch per foot (4 cm/m) . <br /> 3 . The soil around and under the entrance section shall be hand-tamped in 8 inch (20 <br /> cm) lifts to the top of the dike to prevent piping failure around the inlet. <br /> 4 . The slope drain shall be securely staked to the slope at the grommets provided . <br />.r <br /> 5 . The slope drain sections shall be securely fastened together and have watertight <br /> fittings . <br /> Maintenance <br /> The slope drain structure shall be inspected weekly and after every storm , and shall have <br /> repairs made if necessary. The contractor should avoid the placement of any material on <br /> and prevent construction traffic across the slope drain . <br /> ' I <br /> rb Po. <br /> YPMm. I I <br /> Pian ncrnns an <br /> Plate 4. 30d Flared End Section Schematic <br /> Source: VDHBT Road Designs and Standards <br /> 4-103 <br />