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<br />.. <br /> <br />r r ~...., <br />t:.;\;1 <br /> <br />27 <br /> <br />menace from the floods of the Gila, but the investigations <br /> <br />show such poor conditions for droundation and abutments that <br /> <br />tne feasibility of this reservoir is subjcct to doubt. <br /> <br />The control o~ the Colorado River proper is, for the <br /> <br />reasons above stated, the main clement involved, and this <br /> <br />has been investigated extensively. <br /> <br />Possible reservoir sitos nave been found on the Grand <br /> <br />and the Groen rivers, wi,ich, if constructed and operated <br /> <br />for the purpose of flood protecticn, would groatly reduce <br /> <br />the volume of the floods, for though thc areas intercepted <br /> <br />. <br /> <br />by each are small compared with '~he total area of the <br /> <br />Colorado Rivcr Basin, they drain mountains with high pre- <br /> <br />cipitation that furnish a relativc+y large volumc of water. <br /> <br />A reservoir site also exists on the San Juan Rivar, which is <br /> <br />the next tributary of importance, but the fcasibility of this <br /> <br />has not been established. <br /> <br />01 the total area dranod by thc Colorado Ri vor, 244,000 <br /> <br />square miles. 96,000 is drained by the Grand, the Green, and <br /> <br />the San Juan, which, th~ugh draining less trAn two-fifths of <br /> <br />the total area, furnish appro:dmately 84 per cent of the <br /> <br />total water s~,ly. There is still, however, nearly 100,000 <br /> <br />square miles below these r~vers. axclusive of tho Gila, wi,ich <br /> <br />would be uncontrolled by such r3servoirs. These areas, though <br /> <br />. <br /> <br />furnishing a relatively small ~ua.~tity of water, owing to <br /> <br />their aridity, are yet of such extent and declivity that they <br />