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<br />ISg;: <br /> <br />. <br /> <br />Chapter II <br /> <br />Existing flood control structures <br /> <br />The only major flood control structures in the Gunnison-Arkans~s <br />project area are two developments located at Pueblo and near Caddo a'. <br />The Pueblo Flood Conservanoy Distriot was formed as a result of the <br />disastrous flood of 1921, and a major flood oontr6l development was <br />construoted between 1924 and 1926 at a oost of *4,000,000. It consists <br />of a barrier dam across the Arkansas River about 6 miles west of-the <br />City of Pueblo, ~esiSned to decrease all potential floods to 100,000 <br />second-feet 6r less, and an improved ch~el through the city designed <br />to carry 125,000 second-feet of water. To date there have been no <br />floods of great magnitude to test the adequacy of the project. <br /> <br />.' <br /> <br />The barrier dwn has a conorete overflow spillway section vnth <br />earth.nng dikes to hi&her ground. The spill.my section has tyro openings <br />--through-whi:ch~the-Denvor-and" 'Rio"-Gra'nds~l1estcrn Rai-lroad tracks~llncl~the..-" <br />Ar.kans,.-s 'Ri-:ver~ pass.,1'he Be,s seIhe r, Ditoh passes, thr:ouglLthe _earthffl1.:-:.in , <br />0: concrete c-ondu~t" on the - rfGIi~,~- or sou{h sido _orilla vallElY-~-::: ~'=_ ~-~- <br /> <br />,~Tho improvod.-fiood ~hannel:--through~ P~ebl~~i=~ -app~~xi~a~1/::23::rn~Ie;' <br />long. The rivor is confinod' botrltfen a high concroto;'faced"ollrtlifill-~---' <br />dike along tho ontiro flood.my on tho north sido and a natural shalo and <br />gravel bluff on the south side. Rook paving is provided 'in the bottom <br />of tho channel and in places nlong the south side bluffs. Tho slope of <br />the dike on tho concreto.faced river side is 1 1/2 to 1. The crO\"ffi is <br />very narrow and the oarth on tho offstroam side is at tho maximum angle <br />of repose~ The physical eapaoity of the Fresent flood channel appears <br />to be 100,000 second-foct. Howovor, nn obstruction causing curront <br />impingemont could-dostroy the levoo in its present state of disrepair <br />,-nth a flOYI of 15,000 second-foet. No one can-say thD.tthe presont flood... ,1 <br />,vny is safo for ~'iY given flow in oxoess of 10,000 second-foot. <br /> <br />John Martin Resorvoir, primarily a flood control structuro oon- <br />structed by tho Corps of Engineors, is locatod on tho Arkansas River <br />about 1.4 miles doymstrewn from tho villago of Caddo a and about 58 milos <br />upstream from tho Colorado-Kansas Stato line. It is utilizod for flood <br />control, irrigntion conservntion, and sediment control. Tho flood oon- <br />trol capacity of 270,000 acre-feet is d osigned to roduco all floods of <br />record at its site to a spillYm~ discharge of 10,000 second-foot or <br />loss, which is tho approximato c~l1aeity of tho rivor channel dOl'mstronrn ' <br />from tho dam. A capacity of 385,000 aero-feet bolow the flood control <br />space is allocated to irrigation and nodimont storago. Tho total capa- <br />city undor elovution 3,S70 is 655,000 acre-foot. The outlot yrorks aro <br />at elovation 3,768 feet. Tho top of tho irrigation pool is at olbvn- <br />tion 3,851 foet. Tho top of tho spillvruy gutos is ~t olovation 3,870- <br />foot and tho top of tho dam v~rios from olovation 3,880 to 3,883 feet. <br />Exhibits 5 anel 6 show the genoral plan and location of John llartin Dam <br />--<lnd ,Roservoir-.---------- ---- -----------,----- <br /> <br />. <br /> <br />9 <br />