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<br />69 <br /> <br />--+ <br /> <br />Where foundation material is excessively perml2abl(" a cutoff may be used to reduce <br />s<,epage. Different kinds of cutoffs include sheet pil~ walls, fabric reinforced membrane, con- <br />crete walls, or a grout curtain, Where seepage is noti large enough to require a cutoff, the <br />seepage may be collected with drainage blankets, p~rvious trenches, or perforated pipe <br />drains. Any pipe within the levee must be capable o:f resisting all loads that will be applied <br />on it. Cross sections of levees and dikes are shown in figure 7.1.5. <br /> <br />DIKE OR LEVEE PfWTECTION <br /> <br />ODD <br />ODD <br />ODD <br /> <br />3' <br />l <br />!....-- ........ <br /> <br />~MP~~T_E~_F~~O- <br />FILT~:I ----,-- <br />-:::.'=' SHEETPILE <br />....~ CUTOFF <br />" <br />-~ - <br />.... \ <br />, <br />FLOOD PROOFING WITH DIKES' ~\ <br />-'---3 <br />----' <br />~/ <br /> <br />\l <br /> <br /> <br />THESE OR OTHER MEANS -rr;::-.' / <br />SHOULD BE PROVIDED TO <br />NEGATE EFFECTS OF i -~,- <br />SEEPAGE ON BUILDING <br /> <br />----"- <br /> <br />3' <br /> <br />-__-1 <br />f <br /> <br />Sl..-- <br /> <br /> <br />IMPERVIC)US <br />FILL <br /> <br />00 0 . <br /> <br />-+ <br />.~------- <br /> <br />-- <br /> <br />BLANKET DRAII, <br />DIKE WITH BU\NK~T DRAIN <br />---- <br /> <br /> <br />3' <br /> <br />__~ ~_~_--.l <br />"'-"0 <br />/ \ ~ t <br />I \ <br /> <br />/ COMPAGTED \ RANDOM <br />I MPEFlVIious \ FI LL <br />FILii <br /> <br />'\/ <br /> <br /> <br /> <br />DIKE WITH IMPERVIOUS CORE <br />--~ <br /> <br />ROCK OR IMPERVIOUS <br />STRATUM <br /> <br />Figure 7.15, levees and dil'es, (Reference 39) <br />