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<br />Diversion
<br />Twin Lakes Tunnel
<br />Busk-Ivanhoe Tunnel
<br />Columbine Ditch
<br />Ewing Ditch
<br />Wurtz Ditch
<br />Hoosier Pass Tunnel
<br />Boreas Pass Ditch
<br />Englewood's Moffat Tunnel
<br />Total
<br />1 Acre-feet.
<br />
<br />Maximum 1984-93
<br />(at) 1
<br />
<br />62,664
<br />
<br />9,760
<br />
<br />3,100
<br />
<br />2,580
<br />
<br />5,730
<br />
<br />12,400
<br />
<br />334
<br />
<br />4,000
<br />
<br />100,568
<br />
<br />1993
<br />(at)
<br />62,664
<br />4,980
<br />2,478
<br />1,622
<br />4,031
<br />11 ,186
<br />334
<br />4,000
<br />91,295
<br />
<br />Average 1984-93
<br />(af)
<br />
<br />35,211
<br />
<br />5,419
<br />
<br />1,695
<br />
<br />1,185
<br />
<br />2,874
<br />
<br />10,249
<br />
<br />59
<br />
<br />4,000
<br />
<br />60,692
<br />
<br />Fryingpan-Arkansas Project-Diversions through Boustead Tunnel began in 1971.
<br />The average annual diversion during the 1984-93 period was 52,021 acre-feet. The
<br />maximum diversion occurred in 1984 and was 107,600 acre-feet. The operating prin-
<br />ciples for the project state that diversions will not exceed 120,000 acre-feet in any year
<br />and will not exceed a total aggregate of 2,352,800 acre-feet in any consecutive 34-year
<br />period. The latter requirement would mean a long-term average diversion of
<br />69,200 acre-feet. Since the 1984-93 average diversion has been less than this, it is
<br />likely that in the coming decade or so annual diversions may be higher than
<br />69,200 acre-feet (provided that water is available for diversion) to approach the
<br />34-year aggregate limitation.
<br />
<br />Colorado-Big Thompson Project and Windy Gap-The Colorado-Big Thompson
<br />Project was completed in June 1947 and delivers water to the east slope through the
<br />Alva B. Adams Tunnel. The 1965 normalized diversion rate through the tunnel was
<br />285,000 acre-feet. Diversions through the Adams Tunnel averaged 234,950 acre-feet
<br />between 1984 and 1993 with the maximum diversion during that 10-year period being
<br />285,200 acre-feet in 1985. There has been no expansion of diversions through the
<br />Alva B. Adams Tunnel.
<br />
<br />Windy Gap is the newest feature of the Colorado-Big Thompson Project. Windy Gap
<br />pumps water from the Fraser-Colorado River confluence up to Granby Reservoir for
<br />subsequent delivery to the east slope through the Alva B. Adams Tunnel. The Windy
<br />Gap Project began operation in 1987. In 1988, Windy Gap pumped 19,863 acre-feet,
<br />and in 1993 it pumped 21,740 acre-feet. Operation of Windy Gap is expected to
<br />increase diversions by the Colorado-Big Thompson Project by 54,000 acre-feet per year.
<br />The water will be used for municipal and industrial purposes by the cities of
<br />Longmont, Loveland, Estes Park, and the Platte River Power Authority. Values were
<br />supplied by the Colorado Water Conservation Board in consultation with the Northern
<br />Colorado Water Conservancy District.
<br />
<br />Miscellaneous Exports-Miscellaneous exports by 12 small transmountain diversion
<br />ditches have increased by 5,417 acre-feet since 1965. In 1965, the normalized
<br />diversions from these 12 ditches were 19,880 acre-feet, and in 1990 the diversions
<br />were 24,844 acre-feet. The diversions between 1984 and 1993 are summarized on the
<br />following page.
<br />
<br />30
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