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<br />8 <br /> <br />and the lands are, in fact, often enriched by the deposit of silt. <br />Farm buildings are located above the flood line, so that there ie no <br />damage to houees, berns or livestock. <br /> <br />Where the physical situation permits, end the drainage area <br />is not too large, generally a practical and economic plan for flood con- <br />trol might consist of an improved river channel of uniforJII carrywg <br />capacity plul' enough added flood storf<ge C&pa.city so located and de- <br />signed that no more water reaches the improved river channel at any <br />time than can be handled by it without overflowing. It is evident <br />that to accomplish such a result in the most economic manner, a com- <br />prehensive plan for each erea to be protected is necessary in which <br />structures are eo designed and balanced as to give complete protection <br />for the lowest possible cost. It also is evident that if such a plan <br />is put through, the improved river channel must be kept under strict <br />control to prevent future constrictions and encroachments. <br /> <br />A comprehensive flood control plan should afford full pro- <br />tection against the worst flood that can be expected. Partial protec- <br />tion is a poor substitute for complete safety. While half-way measures <br />may be reasonably effective against minor floods, they may be entirely <br />useless when a great flood happens along. In addition, they may en- <br />gender a false sense of security among the Shortsighted, with a con- <br />sequent lOBS of life and heavy property damage when the day of reckon- <br />ing comes. <br /> <br />Chart IV is a map of 8. locality where the above principles <br />have been succes13fully applied. It shows in yellow the location of the <br />five dry retarding besine of the Miami Conservancy District, which <br />pioneered this type of flood protElction in this COl.Ultry. The reservoirs <br />shown in blue are part of the old navigation canal system, and do not <br />contribute to flood control. The flood control reservoirs are located <br />on the tributaries and upper part of the Big Miami River, in southwestern <br />Ohio. They ue ell situated above the principal are8.S to be protected. <br />The drainage area is 3,672 square miles above Hamilton, and 2,600 square <br />