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r <br /> 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 /> r 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 towardthe slope drain at the minimum rate of <br /> Yzinch per foot (4 cm/m) . <br /> 1 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 /> 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 /> ' Plan Eiees[Sw <br /> Plate 4.30d Flared End Section Schematic <br /> Source: VDH&T Road Desions and Standards <br /> A 4r) 3 <br />