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<br />~ ~ ~. ': ";., <br />. U:..... '.... _ ,J J <br /> <br />. <br /> <br />W. G. W11k1nson, Water Commissioner for District No.3, has <br />determ:l.ned the surplus now from 1947 to 1960 from the daily oper- <br />ations on the river and consideration of downstream rights. These <br />nows, averaging 24,500 acre-feet per year are presented. in Table 2 <br />and represent nows storable under a new storage right. <br /> <br />Historic vs Future Conditions <br /> <br />A base condition for measuring the effects of the Cache la <br />Poudre Unit was developed by considering significant changes in the <br />historic water supply and use that may be expected to occur in the <br />future without construction of the \U1it. <br /> <br />. <br /> <br />The "future without" situation for the Poudre Basin was assumed. <br />to comprise the presently irriS/lted lands and presently developed. <br />irriS/ltion facilities with the effects of a considerably expanded <br />municipaJ. and industrial use of present water supplies (discussed <br />elsewhere in this report). No developments are foreseen which would <br />alter the Mountain Supply from historic conditions. Historic <br />transmountain imports were assU!Iled indicative of future conditions. <br />Present ground water development and use were considered. representa- <br />tive of the future conditions. Since CBT deliveries to the Poudre <br />Basin beS/ln in 1953, an average of 105,500 acre-feet per year has <br />been delivered for use in the basin, with a maximum of 155,700 acre- <br />feet in 1954. Based on studies prepared by the Region 7 Hydrology <br />Branch, "Colorado-Big Thompson Project unused carriage capacity," <br />May 1961, it was estimated that CBT deliveries to the Poudre would <br />have averaged 117,500 acre-feet per year during the 1947-1960 period, <br />had that project been in full operation througllout the study period <br />(See notation on Table 4). The estimated future CBT deliveries were <br />considered in developing the base condition. <br /> <br />Basin out now will also be influenced to a degree by the CBT <br />Project. It has been estimated that 10.3 percent of the CBT deliveries <br />to the Poudre would escape the Poudre basin as return now. y <br /> <br />Basin Depletion Study <br /> <br />An analysis of historic water supply and depletions of this <br />supply within the Poudre Basin is presented in Table 3. The first <br />step in the analysis was estimating a net annual water supply, column <br />(6), which included the mountain supply, precipitation over the <br />irriS/lted area and CBT deliveries, less the annual change in content <br />of the plains reservoirs. Basin out now, column (9), was determined <br /> <br />Y CBT Definite Plan Report, Appendix I, Chapter 2, Page 298. <br /> <br />. <br /> <br />19 <br />