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OJ2432 Mention is made of the fact tl.at this alternative would use consumptively approximately 27 percent of the supply between Denver and Wa terton. It appe .'rs that these al terna ti ves should be divided by subbasin or subregion within the South Platte. For example, there i". little point in comparing Grey Mountain to Two Forks si,.!ce the two would not meet the same needs. Fur-thermore, it appears that a serious error is introduced by assuming the same value for irrigation, municipal, and industrial supplies throughout the basin. Alternative.3 - Storage of Mountain Tributary Flows in Geer Canyon, CoffinLop, and GL-ey l'~oLlll'ta.in ReS81.-voiL-S.. Once d9ain the statement is made that it would be possible to divert and deliver 40,000 acre-feet and to oonsumptively use a total of 13,400 acre-feet in these subbasins, whioh is equivalent to 34 percent of Doe undeveloped flow in this tributary area. A reference is needed for the diversion and delivery of 40,000 acre-feet. Furthermore, only one use is assumed and that results in the low consumptive use of 13,400 acre-feet. Regarding Grey Mountain, the report states "the proposed Grey Mountain Reservoir on the Cache la Poudre River west of Fort Collins would have an active storage capacity of 200,000 acre- feet. An estimated 17,000 acre-feet of water would be delivered annually for municipal supplies, 5,700 acre-feet of which would be oonsumptively used (Table 17)." We would like to see a reference provided for this statement. In consideration of alternafives for the Cache la Poudre River,the Idylwilde.Project on the Up?er Poudre was not considered, and it appears .that it should be considered along with Grey Mountain. Because the iegislature has authorized a feasibility study on the Poudre above Fort Collins, it may be appropriate to. consider this as a separate alternative, and the combination of Geer Canyon and Coffintop as a separate alternative. : A feasibility study on expansion of Halligan Reservoir was prepared several years ago, and this shQuld be considered in one of the alternatives. The benefits of:...a Poudre River reservoir include flood control, and better water management capabilities for the basin. These should be mentioned, at least. Alternative 4 - Expansion of Existing Facilities. This alternative includes (1) increasing storage capacities of Gross, Ralston, Stanley and Marston Reservoirs, (2) increasing the capacities within Chatfield, Cherry Creek and Bear Creek Reservoirs, (3) increasing storage capacities for reservoirs operating within the Colorado-Big Thompson Project, and (4) increasing capacities of major irrigation reservoirs in the Lower South Platte (see Alternative 6) . 8