7850 - Laserfiche WebLink

Home Browse Search

1 Reservoir Operating Studies 1 months. In the drier quartile of years (those having a 75 % flow exceedance probability), flows in this reach drop to very low levels as the senior Maybell Canal diversion just upstream takes nearly everything in the river. Comparison to Table 2-4 (the preliminary flow recommendations at Maybell) shows that, under current conditions, the median flows satisfy the flow recommendations in all months. More detailed results of this scenario can be found in Appendix E. Table 2-6 1 1 u Modeled Current Conditions Flows at Maybell (cfs) 1 25% exc. 50% exc. 75% exc. October 317 234 162 November 364 275 228 December 338 247 198 January 304 235 198 February 352 277 255 March 726 513 406 April 3,136 2,102 1,396 May 7,028 5,772 4,069 June 6,385 5,176 3,657 July 1,772 1,018 469 August 387 237 107 September 180 112 44 2040 Demand Conditions without Elkhead Enlargement Project Key Assumptions The future "without project" conditions scenario was defined by the use of projected demands representing year 2040 conditions. These projected demands result in additional depletions, over the "current potential" demands represented in the scenario discussed above, of approximately 38,000 af. This 38,000 of is assumed to reflect full utilization of currently consulted depletions as well as future uses not anticipated in previous Section 7 consultations; thus the 38,000 of includes the depletion effects considered in previous consultations. It is important to note that "full utilization of currently consulted depletions" may imply some reallocation of those consulted depletions among basin water users, since the consultations were not specific about how those depletions would occur. Included in the 38,000 of demand increment is approximately 14,000 of of additional demand associated primarily with municipal use. The remaining 24,000 of of demand is associated primarily with industrial uses such as the construction of additional thermal-electric generation capacity at the Hayden and Craig stations, a new coal-gasification plant, new mining facilities and minor increases in agricultural and snow-making water uses. In most instances, these future depletions would be expected to occur using existing water diversion facilities and water rights. Some modeled future depletions may involve federal actions (e.g., permitting) that would require consultation under Section 7 of the Endangered Species Act. 2-15