. Engineering and Contracting. ng wall a 3 ft. 4-ins. by conduit extends to a blow-off gate-chamber in the levee on the east side of theworks, from which two blow-ofts run to theriver, the larger one, 4 ft. in diameter, havingits outlet at the edge of the river. Thesmaller one, 16 ins. in diameter, extends outfarther, and has three outlets in the centerof and at the bottom of the river. All theoutlets are protected by flap-gates, and in thegate-chamber each blow-off is fitted With asluice-gate. The 4-ft. blow-off was providedto care for a large volume of sewage whichmight pass ov
. Engineering and Contracting. ng wall a 3 ft. 4-ins. by conduit extends to a blow-off gate-chamber in the levee on the east side of theworks, from which two blow-ofts run to theriver, the larger one, 4 ft. in diameter, havingits outlet at the edge of the river. Thesmaller one, 16 ins. in diameter, extends outfarther, and has three outlets in the centerof and at the bottom of the river. All theoutlets are protected by flap-gates, and in thegate-chamber each blow-off is fitted With asluice-gate. The 4-ft. blow-off was providedto care for a large volume of sewage whichmight pass over the overflow weirs in thecollecting and distributing wall, and the is for use when the tanks are the present the sludge is disposed of inthe river when the river rises and the dilutionis sufficiently great, but the city has acquireda large tract of landj adjoining the works,and remote from buildmgs, which can be usedfor sludge disposal should this be found de-sirable or necessary at a later -DUlrituting Well •SECTION ON/-(;-ft Fig. 9—Vertical Sections Through Gate House. South Wall.—The south wall is similar inconstruction to the north wall, but the collect-ing conduit is not reinforced. The effluentfrom each secondary tank is drawn off througheight 2-ft. sluice-gates, a reinforced concretebafllle and a floating scum-board holding back GATE-HOUSE. From the center of the south wall of theseptic tanks the sewage flows through a so-called influent conduit to the gate-house. Thisconduit. -J ft. iJ ins. in diameter, of reinforcedconcrete, is located under the dividing wall February 9, 1910. ENGINEERING-CONTRACTING 133 between Filters Nos. 2 and 3. The flow fromthe septic tanks and to and from the sprinklingfilters is controlled at the gate-house, somedetails of which are shown in Figs. 9, 10and 11. Substructure.—The substructure of the gate-house is of concrete, heavily reinforced, and influent well. From the distributing well thesewage
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