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Section 816.74 (b) Continued. <br />•~ (c) The design of a head-of-hollow fill shall include an internal <br />drainage system which will ensure continued free drainage of anticipated <br />seepage from precipitation and from springs or wet weather seeps. <br />(1) Anticipated discharge from springs and seeps and due to precip_- <br />tation shall be based on records and/or field investigations to deter- <br />mine seasonal variation. The design of the internal drainage system <br />shall be based on the maximum anticipated discharge. <br />(2) All granular material used for the drainage system shall be free of <br />clay and consist of durable particles such as natural sands and gravels, <br />sandstone, limestone or other durable rock which will not slake in <br />water. <br />(3) The internal drain shall be protected by a properly designed filter <br />system. <br />• (d) Surface water runoff from the areas adjacent to and above the fill <br />shall not be allowed to flow onto the fill and shall be diverted into <br />stabilized channels which are designed to pass safely the runoff from a <br />100-year, 24-hour precipitation event. Liversion design shall comply <br />with the requirements of Section 816.43(f). <br />(e) The top surface of the completed fill shall be graded such that the <br />final slope after settlement will be not steeper than 1v:20h (6 percent) <br />toward properly designed drainage channels in natural ground along the <br />periphery of the fill. Surface runoff from the top surface of the fill <br />shall not be allowed to flow over the outslooe of the fill. <br />(f) Surface runoff from the outslope of the ."ill shall be diverted off <br />the fill to properly designed channels which will pass safely a 100- <br />year, 24-hour precipitation event. Liversion design shall comply with <br />the requirements of 816.43(f). <br /> <br />816-102 <br />