. Engineering and Contracting. ch 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 ar
. Engineering and Contracting. ch 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 passes into a series of distributingchambers connecting with the distribution sys-tems in the filters. These distributing cham-bers are built in the upper portion of theouter annular well of the substructure, thelower portion being termed the effluent SECTION ON mil Cnc^t Fig. 10—Longitudinal Section Through Gate House. its. outside diameter is 38 ft. Sewage is firstadmitted from the influent conduit into aninfluent well, 15 ft. in diameter and 25 ft. 3in. deep, located in the center of the sub-structure. The influent well encloses two con-troller wells, approximately elliptical in plan,each 6 ft. 6 ins. wide and 7 ft. long, throughwhich the sewage flows out into an annulardistributing well, 3 ft. in w-idth, enclosing the into which the effluent from the filters flow. Each controller well contains a specially de-signed controller, adjustable from a minimumcapacity of 10, gals, to a maximum ca-pacity of 22,500,000 gals, per 24 hours, andoperating under a minimum loss of head ofabout ft. These controllers were installed to care forthe fluctuating head in the septic tanks, but, -wsix on account of the change in the method ofoperating these tanks, with a constant level,the controlle
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