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benefits due to the amount of supplemental mater being furnished to <br />230,000 acres of currently irrigated land, the proportion of the <br />consumptive use shortage furnished would be a good method of pro - <br />oortionin,; benefits due to each sonerate nroiect feature. Thus, <br />shortanes are expressed both in 1,000 acre -feet and percent of con - <br />sumotive use. <br />Table 3 shows the shorta.es on 230,000 acres of land utilizing <br />historical flows. increased flows from tho Colorado -Big Thompson <br />project, and a 825,000 acre -foot reservoir at the :arrows "ite from <br />Operation No. S. The maximum shortage during the period 1925 -1945 , pas <br />18.4 percent in 1937. The maximum accumulative shortage was 84.6 <br />percent during the period 1931- 1941. Thus, from the standpoint of <br />providing an adequate water supply, this reservoir is justified on <br />the basis that essential minimum needs of 230,000 acres of currently <br />irrigated land are barely furnished if the Rlue -South Platte project <br />is not built. <br />Operation No. 8A, which is also included in table 3, shows the <br />effect of adding the increased return flo available at Yersey from <br />an increased irr.^ortation of 64,800 acre -feet annually by the city of <br />Denver. This effects a reduction of the maximum annual shortage <br />from 18.4 percent to 15.0 percent with the accumulative shortage <br />reduced from 84.6 percent to 54.5 percent. The increased return flow <br />from increased importations by the city of Denver could be utilized <br />on only currently irrigated lands. This is due to the fact that <br />during the period 1935 -1938 no water was available for storage in <br />Narrows Reservoir, so a water supply could not have been assured <br />12 <br />