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Pamphlet T 462 CORNELL UNIVERSITY LIBRARY KOS CORNELL UNIVERSIT UNDED BY EZRA CORNELL Cornell University Library Pamphlet T 462 Modifications of the plan of the new Cro 3 1924 032 873 592 olin , str1 Modifications of the Plan of the New Croton Dam By WILLIAM R. HILL Read before the American Water Works Association at St. Louis , Mo. , June 8th , 1904 Pamphlet 462 21 13861282 ES MODIFICATIONS OF THE PLAN OF THE NEW CROTON DAM . BY WILLIAM R. HILL . The responsibility of the engineer in charge of con- structing dams and reservoirs , is but vaguely appreciated by the public . In view of the many disastrous failures that have occurred , due to faulty plans and poor con- struction , it is made imperative for the engineer to exercise his best powers to insure proper and substantial struc- tures . There is , perhaps , no other field of engineering that develops in the course of construction so many new conditions and unexpected obstacles , and when the en- gineer finds it necessary to make radical changes in the plans , even though involving heavy expenditures and sub- jecting himself to severe criticism , it is his bounden duty to make these changes . The writer had the honor of being Chief Engineer of the Aqueduct Commission of the City of New York , from January Ist , 1900 , to October 14th , 1903. During his incumbency the new Croton Dam was under construc- tion . The purpose of this paper is to explain , as briefly as possible , the original plan of this structure and the im- perative necessity of its modification , and to answer a general demand made upon the writer that would seem to indicate a very widespread interest in these rotable changes .