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<br />4302 <br /> <br />. <br /> <br />. <br /> <br />" <br /> <br />22. Evaj5orati6ii~ records H,r the hasin are rather sparse and in- <br />complete with only two stations. Puehlo City Reservoir has an average <br />total pan evaporation for the period ~\ay through October of 57,72 inches. <br />Sugarloaf Reservoir has an average total pan evaporation for the period <br />July through September of 15.11 inches. <br /> <br />23. STREAMFLOW CHARACTERISTICS.- The Arkansas River is a steep <br />mountain stream from its source to Canon City, a distance of 128 miles. <br />Ncar Canon Ci ty, the river emerges from the mountains through the Royal <br />Gorge. Stream gradients often exceed 50 feet per mile above Canon City <br />and decrease to 10 feet per mile at Puehlo. <br /> <br />24. The Arkansas River floods are of t\;O general types. "Spring <br />floods" \'Ihich result from snO\;mel t, often augmented by storm runoff, and <br />"summer floods" ,;hich result entirely from storm runoff. The spring <br />floods are characterized by moderate flows of long duration, engendering <br />a large vo] ume of runoff. The summer floods are characteri zed by high <br />di scharges and re lati ve Iy small vol urnes of runoff. <br /> <br />~,' <br /> <br />I~ <br /> <br />25. The mountainous areas ahove Canon City are not conducive to <br />high peak floodflm'Js, Streamflow -records at Canon City sho~'.' that for <br />75 years of reco.d the highest peak dis.charge from a drainage area of <br />over 3,100 s'1uare miles is 19,000 c,L~" \;hi.ch oecurred on 2 August <br />19::1. "lost of this flow originated from Grape Creek, a right hank trib- <br />ut[lry immediately upstream of Canon City, The second highest peak of <br />12,300 c.f.s, occurred on 18 August }909, At Pueblo, with a drainage <br />area of 4,686 square miles, the peak discharge for 70 years of record <br />is 103,000 c.f.s. ,;hich occurred on 3 June 1921. The record further <br />sho';s that there was a peak discharge of 30,000 c.f.s. on 5 August 1902, <br />25,600 c,f.s. on 12 July 1923, and 18 other discharges over 10,000 <br />c.f.s, <br /> <br />_ _ _ _ _ _ _ _ _26. _-':fll.€:_channe~L capacity_ Df._the_Arkansas_River~ -above-John-~Iart-in-- - ---- - ~ <br />Dam varies from a few cubic feet per second in the headl,'aters to a <br />maximum of ahout 10,000 c.f.s, in the vicinities of Canon City and La <br />Junta. Channel capacities increase from Pueblo to La Junta, and de- <br />crease from La Junta to Las Animas. The capacities detcrmined by <br />backwater studies arc: below Pueblo, 5.000 c.f.s,; at Avondale, 6,600 <br />c.f.s.; at Nepesta, 8,20~ c.f.s.; at La Junta, 10,200 c.f.s.; and at <br />Las Animas. 6" 500 c. f. s . Stream gaeing data fDr se Iected gages in the <br />Arkansas River Basin in Colorado are listed in table 2. Locations of <br />stream gaging stations are shown on plate 2, <br /> <br />/ <br /> <br />R <br />