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<br />
<br />For this study, losses due to seepage and evaporation were assumed to
<br />occur from the South Canal. The loss pattern, shown in Table 2.2, was
<br />weighted in a manner to assume greater losses in the beginning of the year
<br />to allow the canal banks to achieve saturation. Beginning in July, the
<br />losses were assumed to equal the total lateral demand.
<br />
<br />Table 2.2
<br />South Canal lateral demands during irrigation season, in acre-feet
<br />
<br />Year
<br />
<br />Apr
<br />
<br />620
<br />278
<br />724
<br />318
<br />296
<br />342
<br />
<br />1976
<br />1980
<br />1983
<br />1985
<br />1986
<br />1987
<br />
<br />Mean
<br />AF per day
<br />Demand, cfs
<br />Demand as %
<br />of peak
<br />Est. losses,
<br />Tot. demand,
<br />
<br />430
<br />14
<br />7
<br />
<br />18%
<br />cfs 23
<br />cfs 30
<br />
<br />May
<br />
<br />1,260
<br />1,938
<br />1,840
<br />2,010
<br />1,924
<br />1,980
<br />
<br />1,825
<br />61
<br />31
<br />77%
<br />29
<br />60
<br />
<br />Jun
<br />
<br />2,130
<br />2,170
<br />2,682
<br />2,197
<br />2,068
<br />2,240
<br />
<br />2,248
<br />75
<br />38
<br />94%
<br />42
<br />80
<br />
<br />Jul
<br />
<br />2,482
<br />2,298
<br />2,570
<br />2,310
<br />2,290
<br />2,180
<br />
<br />2,355
<br />79
<br />40
<br />99%
<br />40
<br />80
<br />
<br />AU9
<br />2,870
<br />2,340
<br />2,498
<br />2,270
<br />2,170
<br />1,991
<br />
<br />2,357
<br />79
<br />40
<br />
<br />99%
<br />40
<br />80
<br />
<br />Project 7 supplies to Fairview Reservoir via South
<br />Mean, AF 500 500 500 500
<br />AF per day. 17 17 17 17
<br />Demand, cfs 8 8 8 8
<br />Tot. demand 39 68 88 88
<br />
<br />Canal
<br />500
<br />17
<br />8
<br />88
<br />
<br />Sep
<br />1,158
<br />1,260
<br />1,342
<br />1,260
<br />1,148
<br />925
<br />
<br />1,182
<br />39
<br />20
<br />50%
<br />20
<br />40
<br />
<br />.
<br />
<br />500
<br />17
<br />8
<br />48
<br />
<br />2.1.2
<br />
<br />West Can a 1
<br />
<br />The West Canal is a tributary of the South Canal, and conveys
<br />irrigation flows to about 5,700 acres on the west side of the Uncompahgre
<br />River. The canal was built in 1912 as part of the Reclamation Project. The
<br />canal is about 21 miles long and is generally unlined, although small
<br />portions of its length are lined with a trapezoidal concrete section. Flows
<br />are recorded by the UVWU~ (see ~ppendix ~). Maximum diversions are in the
<br />range of 170 to 180 cfs.
<br />
<br />The West Canal is also used to supply winter stock water to UVWU~
<br />members. These supplies are generally provided directly from the
<br />Uncompahgre River, rather than the South Canal, using a small diversion dam
<br />upstream of the South Canal mouth. No records are kept by the UVWU~ of
<br />quantities diverted for this use. For this study, it was estimated that a
<br />monthly average of 10 cfs was adequate (diverted from the Uncompahgre),
<br />based upon conversations with the UVWU~ General Manager.
<br />
<br />- 2.6 -
<br />
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