Engineering and Contracting . y treatment that maybe necessary before it is drawn into basins 7and S. The addition of hypochlorite of limeor liquid chlorine when necessary may bemade just before the water goes to the filtersor these chemicals may be applied to the fil-tered water as it leaves the filter house. The rated capacity of each of the 40 filterunits is 4,000,000 gals, per 24 hours, or 160, gals, per day for the plant. This out-put may be increased to 200,000,000 gals, perday. should it become necessary to supply thisamount of water. The contract for the concrete substructure,f
Engineering and Contracting . y treatment that maybe necessary before it is drawn into basins 7and S. The addition of hypochlorite of limeor liquid chlorine when necessary may bemade just before the water goes to the filtersor these chemicals may be applied to the fil-tered water as it leaves the filter house. The rated capacity of each of the 40 filterunits is 4,000,000 gals, per 24 hours, or 160, gals, per day for the plant. This out-put may be increased to 200,000,000 gals, perday. should it become necessary to supply thisamount of water. The contract for the concrete substructure,filter boxes, conduits and connections wasawarded to the McCormack-Coombs Con-struction Co. of St. I^uis on .\pril 18, 1913,for the sum of $ Because of thelocation of the filters in basin 7, it was possi-ble for the contractor to design a compara-tively simple plant for mixing and placingconcrete. .\ switch track was laid along thebasin wall, so that material could be dumpedfrom car? into hn« above the mixer which. Fig. 4. View of Filter Boxes and WashvVater Line of New Filters at St. Louis, fromConcreting Tower. placed in a pit ll, ... r. . llii. w the surface - about ? 10 cars >hed will the variable quan- I s into a ^<ir)..|.i ;.. ?: in .i t wcr 11! it. liigh. From tower chutes run for Ihe entire length 336 Engineering and Contracting \ol. XLI. No. 11. of the filters, a total of about 700 ft. Con-crete can be taken from the main chutes atany one of the twelve towers and carried toany part of the work. The grade of the mainchutes is 20 per cent. They are made ofwood, lined with sheet iron, are 12 ins. inwidth and depth and span 45 ft. betweentowers. The moveable chutes are made ofsteel in one piece, and are 12 ins. wide by lUins. deep. The velocity with which the concrete flowsfrom the main tower to its destination isabout 480 ft. per minute. The mixing and placing of concrete wasbegun on July 17, 1913, and up to Feb. , a total
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