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. Memo to Colorado Water Conservation Board From Peter Evans and E.I.Jencsok December 5, 1995 Re: Endangered Fish Instream Flow Water Rights, "15 Mile Reach," Colo. River Page 3 Notice reflects comments received at and prior to the October 20, 1995 special meeting and the November 7, 1995 regular Board meeting. With distribution of the Final Notice, the Board has complied with the public notice process. FISH & WILDLIFE SERVICE FLOW RECOMMENDATIONS The amounts of water being recommended by the Service on a monthly basis for instream flow water rights are provided below. These amounts reflect the Service's recommendations from the May 1995 report. :p~ f'b<W0 ~ U.s. Fish and Wildlife Service Flow Recommendations . Rate Exceed. Jan Feb Mar Apr May Jun Jul Aue Sep Oct Nov Dee 25% 25% 1630 1630 1630 3210 10720 15660 1060 1630 1630 1630 1630 1630 25% 50% 1630 1630 1630 2440 9380 14250 5370 1630 1630 1630 1630 1630 30% 80% 1630 1630 1630 2260 7710 11350 3150 1240 1240 1240 1630 1630 20% 100% 1240 1240 1240 1860 7260 6850 1480 810 810 810 1240 1240 . PHYSICAL WATER AVAILABILITY To evaluate the physical availability of water in the 15 Mile Reach, various studies were conducted by consultants and the Board staff. Physical Water Availability Studies: In 1994 Leonard Rice Consulting Water Engineers (LRCWE) completed a Physical Water Availability Study for the Board. Seven major river basins within Colorado were studied: Gunnison, Yampa, Little Snake, White, Dolores, Colorado mainstem and the San Juan. The purpose of the study was to quantify the amount of water, in volume and rate of flow, for sections of rivers in the Upper Colorado River Basin which have or will have endangered fish flow recommendations. The LRCWE study did the following: ~ Evaluated the study period of 1970-1992 to detennine if it was representative of the complete period of record. ~ Reviewed USGS gaging station records for their appropriateness in characterizing the streamflows within stream reaches of interest. ~ Statistically generated gage records to fill incomplete gage records from the study period. ~ Adjusted gage records to account for'major changes of water use in the basins during the study period ( The purpose of these adjustments was to bring gage station records during the period to an estimated 1992 level of depletion). ~ Presented statistical gage and adjusted gage record results in tabular and graphical formats on an annual, monthly, and daily basis.