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716 CHAPTER 11: Intermittent and Recirculating Packed-Bed Filters <br /> Effluent pipe <br /> ft <br /> 77 <br /> LA <br /> Sand bed 4 in walls <br /> Sand bed <br /> 3 ft Dosing chamber <br /> c <br /> CD <br /> to <br /> 8 in walls <br /> 8+n <br /> Oft <br /> Imhoff tank <br /> v <br /> Influent pipe <br /> (a)Plan view <br /> 22 in 25 in <br /> $ 38 in <br /> Influent <br /> pig : <br /> 6ft 41 in <br /> P i <br /> Effluent <br /> pipe <br /> _ (b)Cross section <br /> FIGURE 11-8 ! <br /> Plan and section views of a typical intermittent sand filter recommended by the U.S. <br /> Public Health Service,for five persons, circa 1915-1920 (Frank and Rhynus, 1920): <br /> (a) plan view and (b) cross section. <br />