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<br />EM 1110-2-1913 <br />31 Mar 78 <br /> <br />A'A17.1RAL 6ROUN~. <br />~ ~?7//// <br />IMPERVIOUS BACKFill <br /> <br />~ <br /> <br /> <br />FI.L TtR MATERIAl..' . ' <br />. (SAND) <br /> <br />,PERFORATeD OI/SLOrreD' <br />COLLECTOR PIP. ' <br /> <br /> <br />,",wIN. <br /> <br />Figure 5-6. Pervious toe trench with <br />collector pipe <br /> <br />measures such as berms. However, wells require periodic maintenance and <br />frequently suffer loss in efficiency with time, probably due to clogging <br />of well screens by muddy surface waters, bacteria growth, or carbonate <br />incrustation. They increase seepage discharge, and means for collecting <br />and disposing of their discharge must be provided. <br /> <br />b. Desi~n of Well Systems. The design of a pressure relief well <br />system involves determination of well spacing, size, and penetration <br />to reduce uplift between wells to allowable values. Factors to be <br />considered are (a) depth, stratification, and permeability of founda- <br />tion soils, (b) distance to the effective source of seepage, (c) charac- <br />teristics of the lands ide top stratum, if any, and (d) degree of <br />pressure relief desired. Guidance on the method used to determine well <br />spacing and penetration is contained in EM 1110-2-1905 (ref. A-3a(6)), <br /> <br />5-8 <br /> <br />e <br /> <br />. <br /> <br />. <br /> <br />e <br /> <br />. <br /> <br />.. <br /> <br />e <br />