File:Cassier's magazine (1911) (14783429813).jpg

Identifier: cassiersmagaz401911newy (find matches)
Title: Cassier's magazine
Year: 1891 (1890s)
Authors:
Subjects: Engineering
Publisher: New York Cassier Magazine Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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^2 to 8 inches in diameter. Thestrainers were made from 10 to 20feet long. These strainers were con-structed of perforated brass sheetsenveloping brass or iron frames, orthey were made of solid brass. Somewells had not only strainers at thebottom, but the strainers were en-veloped and underlaid with gravel.In some cases vitrified pipe was usedin connection with gravel. The em-ployment of gravel seems to havebeen comparatively successful. Butthe whole well system came into dis-favour because of clogging and be-cause of the inefficiency and expenseof the small stations. Two consider-able galleries were accordingly con-structed. One of these consists of awell of brick 18 feet in diameter,with long arms of vitrified tile pipeextending horizontally and below thesurface. The well was sunk to anelevation of —10 feet. The pipes,36 inches in diameter at the well,taper off gradually to 20 inches atthe outer ends. They extend acrossthe line of flow of the water in the THE CATSKILL AQUEDUCT 257
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258 CASSIERS MAGAZINE water-table, and are surrounded withgravel. The joints are left open.The inverts of the pipes are 5 feetabove the well bottom. The entirelength of this gallery—the Wantaghgallery—is 2^ miles or thereabouts.Each pipe drops 3 feet along the in-vert as it approaches the well. Bythis method a supply averaging 1,000gallons daily per lineal foot of pipemay be obtained at an expense of$15 per lineal foot for construction.The Massapequa gallery is of thesame general design, but is half againas long. Brooklyn derives her sup-ply in part from these galleries, inpart from the streams, and in partfrom wells. The remaining boroughs of Rich-mond and Queens derive theirwater supply from driven wells. TheBorough of Richmond (Staten Is-land) is to obtain some additionalwater from the near-by New Jerseymainland. The Croton Falls reser-voir will add something to the Cro-ton possibilities. It has been esti-mated that with this addition the safeminimum supply of water avail-able

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