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ARKANSAS RIVER BASIN, COLORADO, KANSAS, NEW MEXICO D17 70,000 60,000 (\ c z @ 50,000 ~ " ~ ~ t:; 40,000 i:' " 0; " c.J 30,000, 0; ui c " .. 5 20,000 ~ 25 Site No. (pI. I) 39-------Near Hoehne, Colo. 44 Near Alfalfa, Colo. S!--n.-m......-Near Las Animas, Colo. ',. " : ~ 10,000 14 15 16 17 JUNE 1965 18 19 20 o FIGURE 8. _ Discharge hydrographs from selected gaging stations on Purgatoire River, Hoehne to Las Animas, Colo. these creeks, the peak discharge near Alfalfa was not as high as it might have been. . Between the gaging station near Alfalfa and a miscellaneous site near Thatcher on the Purgatoire River, the peak discharge increased about 20,000 cfs from an intervening area of 615 square miles. Two measured tributaries with combined drainage areas of 164 square miles contributed peak flows of about 7,000 cfs of this increase. At the gaging station at Ninemile Dam near Higbee, the peak discharge was an estimated 105,000 cfs, representing an increase of 57,300 cfs from 965 square miles of drainage area between the miscellaneous site and Ninemile Dam. Chacuaco Creek, with a peak flow of 38,900 cfs, was evidently the greatest contributor to the increase in this reach, Three significant peaks of the Purgatoire River occurred at the station near Las Animas during the flood period. The first peak on June 14 also oc- curred at the station near Higbee but not at the Alfalfa station. A local storm of considerable magnitude must have occurred in the area upstream from Higbee, possibly in Chacuaco Creek basin, where there are no precipitation stations. Two outstanding peaks occurred on June 18; both, however, were considerably less than the peak discharges that occurred up- stream. The first peak, 59,900 cfs, was caused mainly by the flood water