Laserfiche WebLink
<br />0471 <br /> <br />through 1974, the average annual flow of, the South Platte River at the <br /> <br />Narrows Dam site was 422,700 acre-feet; for the period 1947 through 1974, <br /> <br />the average annual flow at Balzac, Colorado, was 318,100 acre-feet. <br /> <br /> <br />Based on the point flow study which was used to determine the storable <br /> <br />flows for the "Narrows Unit Feasi bi 1 ity Study," 237,000 acre-feet <br />(1947-1974) of the 422,700 acre-feet at Narrows Dam site was surplus <br />water and flowed out of the State unused. A detailed description of <br />this study may be found in the "Narrows Unit Hydrology Appendix, 1966." <br /> <br />Divertible Flows <br /> <br />Based on a hydrograph analysis of hiS~~} flows and the storable <br /> <br />flows for Narrows Reservoir, the .eft'i~~t'~C1 '~rage annual supply <br />", ',' ',,\~ <br />/\, ..', -."\. 'oJ> <br />divertible from the South ~a'he Rivet; fbr recharge is 100,300 acre-feet. <br />< . . V' <br />, ' -' <br />The annual divertible~ows rang~'-from 3,400 acre-feet in 1954, to <br />. , . , <br />""- " ,.- <br />307,400 acre-fe\ 1n 1973:.;tfiese values were resolved using a diversion <br />season which exte* ~:;'arch through November and a total canal <br />capacity for the recharge system of 1,370 ft3/s. <br /> <br />Ground-Water Operation Study <br />A ground-water operation study was used to determine the yield which <br />could be expected from the ground-water storage of surplus flows <br /> <br />and from the subsequent pumping of this water to meet the computed <br />supplemental water requirements of the 23 major ditch systems in the <br />Lower South Platte Water Convervancy District. Figure E-1 shows the <br />annual farm delivery requirements for the ground-water alternative <br />