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<br />r
<br />
<br />22
<br />
<br />3888
<br />
<br />MISSOURI RIVER BASIN
<br />
<br />other purposes, but produces large flood-control benefits by storing
<br />excess flows during }Jigh-watcr periods.
<br />13. Under the Flood Control Act of .Juue 28, 1938, the general
<br />comprehensive plan for flood control and other purposes in the
<br />Missouri River Basin as set forth in Flood Control Committee Docu-
<br />ment No. 1, Sc\~ent'y-fifth Congress, first session, was approved, and
<br />$9,000,000 uuthorized for reservoirs for the initiation and partial
<br />accomplishment of the plan. Construction work has beeu started
<br />on one reser\'oir project only, the Kanopolis Dum on the Smoky Hill
<br />River in central Kansas, at an estimated totol cost of $9,000,000.
<br />Completion of the construetiou work on this dam hos been deferred
<br />in order to conserve" critical muterials find manpower.
<br />14. Under the Flood Control Act of August 18, 1941, there was
<br />authorized to be OpPfopl'inteu in addition to previous authorizations,
<br />$7,000,000 for the prosecution of the comprehensive plan approved
<br />in the act of June 28, .1938, including the Harlan County Reservoir
<br />on the Republican River in Nebraska und such other supplemental
<br />work on the Republican River as the Seerctary of War and the Chief
<br />of Engineers may find advisable. The plan presented in this report
<br />provides for necessary and desirable doms on tributaries of the
<br />Republican River as well as the Harlan County Dam on the main
<br />stem of thut river as authorized in the Flood Control Act of 1941.
<br />15. A system of levees along the Missouri River between Sioux
<br />City, Iowa, and Kansas Cil.y, :Mo., and a bank-erosion project just
<br />above Sioux City were authorized by the Flood Control Act of 1941,
<br />substantially in accordance with the pJ.ws presented in House Docu-
<br />Inent 821, Seventy-sixth Congress, third ~cssion. The plan included
<br />in House Docmnent 821 would provide protection against discharges
<br />similar to those which occurred during the 1938 1I00d. '
<br />16. A project for proteet.ion of the Kl1nsas Citys of Kltllsas and,
<br />Missouri wus authorized for construet.ion in the Flood Cont.rol Act
<br />of 1936, '''in aceord.wce with plaus approved by the Chief of Engi-
<br />neers on reeommendat.ion of the Board of Engineers for Rivers and
<br />Harbors find as fl,mended by further surveys and studies now in prog-
<br />ress * * *.lI Construct.ion of some of the units of this project
<br />wns start8d but has since been deferred in order to conserve criticn.l
<br />llw,tcrinls and manpOVt,.cr for the war effort. Further studies hnve.
<br />b.ecn made ,md a survey report dated Jnne 2;, 1942, hns been sub-
<br />mitted to the Chief of Engineers. The report of Jnne' 27, 1942,
<br />proposes modification of tlte plnu used as a hasis for tlte authorization
<br />in tlte Flood Control Act of 1936 to include a cut-off at Liberty Bend,
<br />near the Kansas Cit,ys, and various changes in "nlinelnent and height
<br />of the proteeti\"e works. The plans presented in the report of June,
<br />27, 1942, were discussed at tlte hearings of the Flood Control COIll-
<br />mittee in Jnne 1943.
<br />
<br />II. FLOOD CHARACTERISTICS
<br />
<br />17. General.-The Missouri River between Sio1L~ City, Iowa, and
<br />tlte mouth is subject to two general periods of high water each year.
<br />The first is often referred to as the l\'larch rise. It is caused by the
<br />rapid melting of snow in the Plnins ureas in J\..1ontana, ~Vyonling, and
<br />the Dakotas and the hreak-up and melting of the ice in t.he main
<br />stem and its trihutnries. This melting of snow and ice occurs in a.
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