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<br />I' <br /> <br />. <br /> <br />,"0' t","':' <br />/;.:> (., u <br /> <br />. <br />! <br />I <br /> <br />. <br /> <br />46 <br /> <br />The control of the river during construction ~~d im- <br /> <br />madiately after would form a pon1 of varying magnitude just <br /> <br />above the d~'filled with the muddy waterg of the Colorado <br /> <br />and these would daposit their sediment on the river bed and <br /> <br />lower toe of the dam in such manner as to for", something <br /> <br />of a seal and tend to prevent water entering the foundation <br /> <br />at any considerable velocity. <br /> <br />This plan of constr~ction was disc~seed ~ith Secretary <br /> <br />Lane in obtaining authority for the extensive investigations <br /> <br />of the Colorado River in 1914. It had previously, and,has <br /> <br />since be3L discussed by tn3 au~hor with manr engineers in <br /> <br />order to bring out, if possible, any weak points connected <br /> <br />with the plan, and some of the details of this plan have <br /> <br />bean modified as the !'~3ult. of -such d.isc.us~3ions~ T!'-~ey are <br /> <br />of course subjeot to further mo~ification by f'JOrther thought, <br /> <br />and especially by the experience 0btained during construction. <br /> <br />The plans were ~orked out in mere detail ~ld estimates made <br /> <br />on the basis of such a structure as compared wi~~ a dam built <br /> <br />of concrete under the direction of the Chief Engireer of the <br /> <br />Reclamation Service BY I~. John L. $avage, Designing Engineer, <br /> <br />u, S. Reclar~tion Service, and his assista~ts. <br />