. Engineering and Contracting. basins Mean low water in river Total (,_eo2ia*4o?.i.—so- filters are shut oft with a T-ft. rise in theriver, the septic tanks can still be operated,even up to maximum high water in the river,the effluent from the tanks llowing to the gate-house, through the by-pass between theinfluent and effluent wells, and then outthrough the effluent conduit directly to theriver. CO^•CRETE. In the construction of the sewage purifica-tion works, concrete, both plain and rein-forced, was used extensively. The relativevolumes of cement, sand and ballast
. Engineering and Contracting. basins Mean low water in river Total (,_eo2ia*4o?.i.—so- filters are shut oft with a T-ft. rise in theriver, the septic tanks can still be operated,even up to maximum high water in the river,the effluent from the tanks llowing to the gate-house, through the by-pass between theinfluent and effluent wells, and then outthrough the effluent conduit directly to theriver. CO^•CRETE. In the construction of the sewage purifica-tion works, concrete, both plain and rein-forced, was used extensively. The relativevolumes of cement, sand and ballast in theseveral classes of work were as follows; Mean low water in river 1:2: 4.—Water-tables, belt courses, window-sills, lintels, etc.; sub-structure of gate-house (except foundation floor), and walkover influent conduit wall; reinforced floors,columns, stairways, and :2%: 5%.—Sprinkling fllters. settling basins,collecting and distributing, and north and I ,Gi->vel Walt 0 (hick 1 / @—S Water Main. 21 Vitrified Sewer Pipe Fig. 19—Section Through Part of Settling Basin. Operation During Freshets.—With a in the river, the settling basins would beshut off, but the filters could still be operatedunder normal conditions. With a total rise of i7 ft. in the river the filters would cease to befree-draining at the bottom, and would prob-able be shut off. It would be possible, how- south walls of septic tanks; conduits andblow-offs, foundations and miscellaneoussmall structures. : 3 : 7.—East and west outside walls, bafflewalls, and dividing walls of septic tanks(except collecting and distributing wall). The specifications for the concrete were sim- ^BLE II.—UNIT COSTS Side Sewage Pumping Station. Superstructure Main Sewage Pumping Station. Substructure Superstructure Total Gate-House, Sewage Purification Works. Substrucnire Superstructure Total ; Pump House, Sewage Purification Works. Superstructure Septic tanks Sp
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