Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 224
186 ASSOCIATION OF ENGINEERING SOCIETIES. Each of the filter beds, I F and 2 F, contains 13 500 sq. ft. of filter surface, or one-third acre, and each sludge bed 6 000 sq. ft. They are under drained by two lines of 4-in. drain pipe running longitudinally. The under drainage system is so arranged… … Fig. 1 2. or it can all be sent to the lower end of the beds, where it enters a sewer connecting with the river below the pond. The filter and sludge beds are four feet in depth and composed of graded material. Bed No. 1 has three feet of cinders and a top coating of sand one foot thick. Bed No. 2…
Engineering
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