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<br />Memorandum
<br />Gunnison Hydrology
<br />June 25, 1991
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<br />3 . Natural inflow between Crystal and Blue Mesa
<br /> 1,266,850 - 1,067,410 = 199,440 (1940-1985)
<br /> 1,323,000 - 1,132,000 = 191,000 (1906-1983)
<br /> 1,224,700 - 1,039,900 = 184,800 (1940-1983)
<br /> 1,344,764 - 1,146,000 = 198,764 (1906-1985)
<br /> 396,000 - 329,000 = 67,000 (1977)
<br />4. Unregulated inflow between Crystal and Blue Mesa
<br />
<br />199,440 - 55,030 = 144,4l0 (1940 - 1985)
<br />191,000 - 55,030 = 135,970 (1906 1983)
<br />184,800 - 55,030 = 129,770 (1940 - 1983)
<br />198,764 - 55,030 = 143,734 (1906 1985)
<br />67,000 - 55,030 = 11,970 (1977)
<br />
<br />The 55,030 AF value represents total active storage space in
<br />Morrow Point and Crystal. This value is conservative in that
<br />normal operations of the units constantly fluctuate reservoir
<br />levels which often creates the ability to do more regulation
<br />than indicated. However, under a strict accounting these
<br />reservoir units would not be entitled to anymore water than
<br />indicated unless they are dropped below minimum power pool at
<br />some time. Thus, this is a fair portrayal of what should happen
<br />even though as a practical matter it probably has not and may
<br />not occur in the future.
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<br />5. Unregulated flow into Blue Mesa = Natural flow - Depletions
<br />
<br />329,000 - 67,530 = 261,470
<br />1,067,410 - 67,530 = 999,880
<br />1,132,000 - 67,530 = 1,064,470
<br />1,039,900 - 67,530 = 972,370
<br />1,146,000 - 67,530 = 1,078,470
<br />
<br />(1977)
<br />(1940 - 1985)
<br />(1906 - 1983)
<br />(1940 - 1983)
<br />(1906 - 1985)
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<br />6.
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<br />Historical depletions above Blue Mesa
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<br />= 67,530
<br />
<br />The depletions above Blue Mesa have been estimated in a number
<br />of reports including the CWR&PDA Upper Gunnison-Uncompahgre
<br />Basin Phase I study (53,500 AF); the 1953 Clifford Jex study
<br />(57,700 AF); and the 1968 USDA Study (57,681 AF). If you add on
<br />10,000 AF for Aspinall Unit evaporation and reduce Jex and USDA
<br />values by 4,000 AF to reflect agricultural consumptive loss due
<br />to inundation by the Aspinall Units the depletion values would
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