Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 460
irelength of overfall, 1,443 feet; average depth below crest of dam, 12 feet. Where the body of water which may at any time discharge over the dam islarge, and the fall high, it is especially desirable to secure a location Avhere theoverfall can be upon solid rock. If there be a ledge at the side… … Fig. 1047. When the dam can have only an earth foundation, an artificial apron, or plat-form of timber or rock, is to be made, on which the water may fall, or the highfall may be broken up by a succes-sion of steps. In some cases a rollor incline, like that given in theCroton dam, is extended to…
Mechanical drawing
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