. Railroad structures and estimates . EARTH DAM -•Pluk. FIuk-BoxiUled with Mcoe WASTE WEIRFig. 218. Fig. 218 represents the general cross section for earth dam;with ordinarj material it is recommended that the upstreamslope should not be steeper than 1 to 3, the rear slope 1^ to 1,preferabl} 1 to 1, top width not less than 6 ft. for a height of10 ft. or less, 8 ft. \Nide from 10 to 15 ft. high, and 10 ft. wide for15 to 20 ft. high. The foundation should be on firm ground, with all sod and per-ishable matter removed over the entire area of the foundationfor a depth of at least 6 inches, to prev
. Railroad structures and estimates . EARTH DAM -•Pluk. FIuk-BoxiUled with Mcoe WASTE WEIRFig. 218. Fig. 218 represents the general cross section for earth dam;with ordinarj material it is recommended that the upstreamslope should not be steeper than 1 to 3, the rear slope 1^ to 1,preferabl} 1 to 1, top width not less than 6 ft. for a height of10 ft. or less, 8 ft. \Nide from 10 to 15 ft. high, and 10 ft. wide for15 to 20 ft. high. The foundation should be on firm ground, with all sod and per-ishable matter removed over the entire area of the foundationfor a depth of at least 6 inches, to prevent disintegration andpossible leakage. When the height exceeds 10 ft., an intercepting or bond trench2 ft. deep, from 6 to 12 ft. wide, should be made running the fulllength. The inner slope should be protected with a thick layer of hardmaterial, and when subject to wave action a further layer ofhea\y rock should Vje provided; the rear slope is best protectedby sod. The waste way if possible should be located at a natural gap. 470 CRIB AND MASONRY DA
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