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-r- N - M CHAPTER III WATErl SUP,'LY Quality In w~ter year 1941 the Bureau of Reclamation sampled and anaLyzed water from points near the Rifle Creek and E~st Rifle Creek gages. All samples were found suitable for irrigation although water from East Rifle Creek was found superior to that of Rifle Creek. The following table gives the results of analyses made of the Rifle Creek water. The averages are weighted to show average quality of water that would be stored in the reservoir. Total Milligram eauivalents ner liter Conduct- dissolved Soluble Cations Anions ance solids sodium IOW.05) (oom) [oercent Ca Mg Na HCO, SOl.. Cl N01 ~ast Rifle Creek Maximum 63 398 5 4.24 2.09 0.32 4.22 2.28 0.31 0.09 Average 53 327 4 3.44 1.76 0.24 3.23 1.90 0.l6 0.01 lifle Creek at dam site Maximum 146 1,310 18 9.15 6.91 3.24 4:&[ 13.6 0.43 0.39 Averafle 90 664 10 5.52 :,.15 1.1'7 3. 8 5.90 0.2l 0.05 QUALITY OF RIFLE CREEK WATER Return flow from irrigated lands .rrigation near Rifle for the past 65 cands is of relatively good quali ty. .ands carries considerable amounts nf .s unsuitable for domestic use, i:t is has been successfully used for years. Return flow from higher Water returning from the lower dissolved salts, and although it successfully reused for irrigation. Water Requirements :onsumptive Use Project lands are estimated to require 2.20 acre-feet an acre Lnnually for consumptive use. This estimate was based on a relatioll- hip between consumptive use and cumulative day-degrees of temperature lbove freezing during the growing season, Temperatures recorded at tifle were used in milking the estimate as Rifle is at approximately ,he same elevation as the project lands and is climatically represen- ative of the area, I , I , 22