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<br />.~ ,. ......
<br />
<br />Relationships of CRSP Shared Reservoir Evaporation to Total CRSP Storage
<br />
<br /> Average Average CRSP
<br /> CRSP Live CRSP Active Shared
<br />~ Storace {aO Storace (aO EvaD{aO Rearession Analvses
<br />1968 10,006,534 5,123,250 251,646 Active Storage:
<br />1969 11,701,142 6,764,000 315,083
<br />1970 14,222,401 9,231,741 367,164
<br />1971 16,417,858 11,354,088 442,260 Relation of CRSP Shared Evap to Active Stolrllge
<br />1972 17,229,715 12,165,945 449,544 i 800,000
<br />1973 19,703,066 14,639,296 504,409 0. 700,000
<br />1974 22,158,563 17,094,793 590,940 Q
<br />aii
<br />1975 23,634,096 18,570,326 613,612 I 600,000
<br />1976 24,105,743 19,041,973 626,694 Q 500,000
<br />.c
<br />1977 20,730,592 15,672,536 537,406 In
<br />ll. 400,000
<br />1978 19,158,480 14,106,380 519,065 l:!
<br />1979 22,336,514 17,284,414 612,639 0 300,000
<br />ii
<br />1980 25,709,770 20,657.670 688,502 ~ 200,000
<br />c
<br />1981 25,392,305 20,340,205 648,525 .i 100,000
<br />1982 25,835,729 20,783,629 666,691 0
<br />1983 27,692,454 22,640,354 734,416 0 5 10 1~ 20 25
<br />1984 27,759,568 22,707,468 714,727 Mllllona
<br />1985 27,619,938. 22,567,838 702,973 Average CRSP Active Storage (at)
<br />1986 27,414,909 22,362,809 706,131
<br />1987 27,153,464 22,101,364 705,172
<br />1988 26,465,639 21,413,539 689,455 Live Storage:
<br />1989 24,540,351 19,488,251 634,821
<br />1990 21,806,134 16,754.034 549.702
<br />199.1 20,141,572 15,089,472 510,689 Relation of CRS.P ~hared Evap to l.1ve Storage
<br />1992 19,208,740 14,156,640 491,352 800,000
<br />1993 21,297,564 16,245,464 573,884 t 700,000
<br />1994 23,080,796 18,028,696 589,440 600,000
<br />1995 24,500,724 19,448,624 649,206 Do
<br />! 500,000
<br />1996 26,252,053 21,199,953 671.123 ii 400,000
<br />1997 26,416,641 21,364,541 681,115 ~
<br />c 300,000
<br />1998 27,174,302 22,122.202 693,294 ~
<br />1999 27,050,819 21,998,719 694.007 200,000
<br />2000 25,830,330 20,778,230 660,675 100,000
<br />2001 23,802,258 18,750,158 614,593 0
<br />2002 20,256,954 15,204,854 512,030 0 5 10 15 20 25 30
<br />2003 16,472,537 11,420,437 427,526 Average CRSP Live Storage (at) Mllllona
<br />2004 14,160,551 9,108,451 355,545
<br />
<br />
<br />
<br />Notes:
<br />(1) Historic calendar year data from Bureau of Reclamation. Average storage values are based on the average of the
<br />end-of-year storage amounts for the year indicated and for the previous year. Storage amounts include storage in all
<br />CRSP units, including Lake Powell, Flaming Gorge Reservoir, Navajo Reservoir and the Aspinall Unit (Blue Mesa,
<br />Morrow Point and Crystal reservoirs).
<br />(2) CRSP shared evaporation includes lake evaporation for Lake Powell, Flaming Gorge Reservoir and the Aspinall Unit
<br />reservoirs, and is shared between the Upper Division States in proportions to their Upper Colorado River Basin
<br />Compact Article lII(a) apportionments, CRSP shared evaporation is approximately 10,000 af at zero live CRSP
<br />storage (5,000 af based on the regression analyses) and approximately 130,000 af if storage in all CRSP reservoirs
<br />were at the top of the inactive pools (133,000 af based on the regression analysis). Lake evaporation for Navajo
<br />Reservoir is not included in CRSP shared evaporation.
<br />(3) Data for the period 1968-2004 were used in the regression analyses. Data prior to 1968 do not reflect a normal
<br />distribution of storage between CRSP unit reservoirs under future operational conditions (for example, NavajO Reservoir
<br />storage remained below the top of the inactive pool required for operation of the NavajO Indian Irrigation Project diversion
<br />from 1962 when it began storing water until 1968, and Morrow Point Reservoir began operation in 1968). For the period
<br />1968-1977, the historic average end-of-year CRSP storage and annual CRSP evaporation amount were increased to
<br />reflect the average storage of 15,670 af and average evaporation amount of 340 af occurring at Crystal Reservoir after its
<br />initial filling in 1978.
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