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<br />en <br />c:; <br />C'j <br /> <br />CHAPTER III <br /> <br />WATER SUYJ:'LY <br /> <br />above the dam site. Irrigation diversion records are collected and <br />maintained under the direction of the state Engineer. <br /> <br />Extensi on of Records <br /> <br />The available discharge records were extended by correlation to <br />cover the 20-year period, 1930 to 1949. The 7-year record on East <br />~.c~.,above tl1e.,QI'as.s.\[aJ.ll>yCaD.:!ilwas correlated with the record <br />of ~,B~;ver near Jl!l2.~~~' White River above Meeker drains the slopes <br />across the divide.-from Rifle Creek, and, like East Rifle Creek, has a <br />fairly high base flow. The gaged run-off of East Rifle .Creek was not <br />adjusted for the three smell irrigation diversions made above the gage <br />since these same diversions and resulting return flow would be expected <br />to continue with proj ect operation. <br /> <br />Discharge that would have occurred at Rifle Gap Dam site if no <br />diversions had been made to Grass Valley Canal was estimated by adding <br />canal diversions to discharge at the dam site where records were avail- <br />able concurrently. Otherwise the discharge was computed by adding <br />inflow between the two gages to discharge at the East Rifle Creek gage. <br />Inflow between the gages, most of which comes from West and Middle Rifle <br />Creeks, was computed from concurrent records at the gages, with consider- <br />ation given to the Grass Valley Canal diversions. The computed inflow <br />was extended to cover the 1930-l949 period by correlation with the flow <br />of Buzzard Creek near Collbran. The character of the Buzzard Creek <br />watershed and run-off is similar to that of J'Iest and Middle Rifle Creeks. <br /> <br />Available supply <br /> <br />From records and correlations, the average run-off of East Rifle <br />~reek above the Grass Valley Canal diversion is estimated at 29,700 <br />acre-feet annually. The average run-off of Rifle Creek at the Rifle Gap <br />:lam site, with no diversions made to the Grass Valley Canal, is esti- <br />mated at 38,600 acre-feet annually. The estimated monthly and annual <br />flows of East Rifle Creek and of Rifle Creek at tile Rifle Gap Dam site <br />tor the 1930-l949 period are given in the tables on pages 20 and 21, <br />respecti '1e:...y. <br /> <br />:9 <br />