. Engineering and Contracting. The filters are designed to yield normally? gals, per acre per 21 hours, restingone-half of the time, requiring therefore arate of gals, per acre per 24 hourswhen in service. It is possible, however, tooperate them at somewhat higher rates. Tlicdetails of the filters are shown in Fig. 11 toFig. 15, inclusive. Walls.—The outside and dividing walls wereof concrete, and were designed simply as lightretaining walls and not to resist water pres-sure on one side with no filtering material onthe other. To provide access to the gate-houseso that it can
. Engineering and Contracting. The filters are designed to yield normally? gals, per acre per 21 hours, restingone-half of the time, requiring therefore arate of gals, per acre per 24 hourswhen in service. It is possible, however, tooperate them at somewhat higher rates. Tlicdetails of the filters are shown in Fig. 11 toFig. 15, inclusive. Walls.—The outside and dividing walls wereof concrete, and were designed simply as lightretaining walls and not to resist water pres-sure on one side with no filtering material onthe other. To provide access to the gate-houseso that it can be reached when the two addi-tional filters are constructed, withoiit havingto walk across the surface of the filters, anelevated reinforced concrete walk has beenbuilt above and is supported on the dividingwall between Filters Xos. 2 and 3. Distributing Svstem.—ln order to provideprotection from the frost, the distribution sys-tem is built below the surface of the filters,and consists of main distributors, lateral dis-. SECTION ON k-l
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