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<br />.. <br /> <br />.. <br /> <br />Memorandum <br />Gunnison Hydrology <br />June 25, 1991 <br /> <br />match the most recent CWR&PDA study results. Thus, a depletion <br />of 67,530 AF is certainly very reasonable. <br /> <br />7. <br /> <br />Estimated future upstream depletions <br />including Silver Jack (Bostwick Park) <br /> <br />= 60,000 AF <br /> <br />This value simply reflects the subordination agreement. To date <br />there are only an estimated 1400-1900 AF of depletions occurring <br />under the subordination. <br /> <br />8. Average annual diversion to the Gunnison Tunnel = 336,400 <br /> <br />The AB Lateral hydropower study shows historical diversions of <br />337,824 AF or a difference of 1,424 AF. Such a difference is <br />not considered significant enough to change for this rough <br />analysis. <br /> <br />9. <br /> <br />Minimum Annual Releases from Blue Mesa <br /> <br />= 756,000 AF <br /> <br />This represents the minimum amount required to be released for <br />power purposes to make the project economically viable according <br />to the USBR, "Economic Justification Report for the Aspinall <br />Unit", dated February, 1959. Releases from Blue Mesa were only <br />527,000 AF in 1990, and 522,000 AF in 1989. Prior to this, the <br />release in 1978 which totalled 707,133 AF was the lowest of <br />record (334,929 AF to Gunnison Tunnel + 371,204 AF measured <br />below the tunnel). One premise for the value is that this is <br />the minimum which should be released to meet downstream demand, <br />Given that there were calls for water in 1977 and 1978 by <br />Redlands this value would appear acceptable. However, according <br />to the State Engineer's office, the releases in 1989 and 1990 <br />were adequate. Mr. Kepler noted that Redlands did call in 1989 <br />but in 1990 Redlands did not call and made it through with just <br />minor shortages during March and a few days during the summer. <br />Thus, a release of 555,017 AF (327,824 + 217,193=555,017)Zis <br />probably closer to today's actual needs. <br /> <br />10. Minimum Annual Release from Blue Mesa <br />to Downstream seniors and Powell <br />(Min Ann Rel 756,000 AF - 336.400 AF to Gunnison Tunnel = <br />419,600 AF) <br />(Alternative Min Ann Release = 556,000-337,824=218,176) <br /> <br />Keep in mind that these releases still gain tributary inflow. <br /> <br />3 <br />