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The Project Gutenberg EBook of Transactions of the American Society of Civil Engineers, vol. LXXII, June, 1911, by E. D. Hardy This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.net Title: Transactions of the American Society of Civil Engineers, vol. LXXII, June, 1911 Water Purification Plant, Washington, D. C. Results of Operation. Paper No. 1191. Author: E. D. Hardy Release Date: December 27, 2008 [EBook #27632] Language: English Character set encoding: ASCII *** START OF THIS PROJECT GUTENBERG EBOOK SOC. CIVIL ENGINEERS, JUNE 1911 *** Produced by Juliet Sutherland, Christina and the Online Distributed Proofreading Team at http://www.pgdp.net Transcriber's Notes: 1. Tildes are used to denote text in small caps. AMERICAN SOCIETY OF CIVIL ENGINEERS INSTITUTED 1852 TRANSACTIONS Paper No. 1191 WATER PURIFICATION PLANT, WASHINGTON, D. C. RESULTS OF OPERATION.[1] ~By E. D. Hardy, M. Am. Soc. C. E.~ ~With Discussion by Messrs. Allen Hazen, George A. Johnson, Morris Knowles, George C. Whipple, F. F. Longley, and E. D. Hardy.~ The Washington filtration plant has already been fully described.[2] At the time that paper was written (November, 1906), the filtration plant had been in operation for only about 1 year. It has now been in continuous operation for 5 years, and many data on the cost, efficiency, and methods of operation, have accumulated in the various records and books which have been kept. It is thought that a brief review of the results, and a summary of the records in tabular form, will be of interest to the members of the Society, and it is also hoped that the discussion of this paper will bring out the comparative results of operation of other filter plants. As a matter of convenience, the following general description of the plant is given. _Description of the Filtration Plant._--The Washington filtration plant was completed and put in operation in October, 1905. It consists of a pumping station for raising the water from the McMillan Park Reservoir to the filter beds; 29 filters of the slow sand type, having an effective area of 1 acre each; the filtered-water reservoir, having a capacity of about 15,000,000 gal.; and the necessary piping and
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