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<br />EM 1110-2-1913 <br />31 Mar 78 <br /> <br />, <br /> <br />Table 2-1. Factors Requiring Intensive Field <br />Investigations and Design Studies <br /> <br />Factor <br /> <br />Field Investigations and Design Studies <br />Should Be More Extensive Where: <br /> <br />Previous experience <br /> <br />Consequences of failure <br /> <br />Levee height <br /> <br />Foundation conditions <br /> <br />Duration of high water <br /> <br />Borrow materials <br /> <br />Structure in levees <br /> <br />There is little or no previous experience in <br />the area particularly with respect to <br />levee performance <br /> <br />Consequences of failure involving life and <br />property are great (urban areas for <br />instance) <br /> <br />Levee heights are great <br /> <br />Foundation soils are weak and compressible <br /> <br />Foundation soils are highly variable along <br />the alignment <br /> <br />Potential under seepage problems are severe <br /> <br />Foundation sands may be liquefaction <br />susceptible <br /> <br />High water levels against the levee exist <br />over relatively long periods <br /> <br />Available borrow is of low quality, water <br />contents are high, or borrow materials are <br />variable along the alignment <br /> <br />Reaches of levees are adjacent to concrete <br />structures <br /> <br />2-2 <br /> <br />e <br /> <br />. <br /> <br />; <br /> <br />. <br /> <br />. <br /> <br />e <br />