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<br />"J '
<br />iJ. ,I
<br />
<br />175
<br />
<br />9
<br />
<br />c. Changes In farm practice resulting in higher consumptive use
<br />and brought on by more rel iable water supply, principally In
<br />the area served by the Colorado-Big Thompson Project.
<br />
<br />2. The droulh of the 1930's was more severe on the plains than In the
<br />mountains. and seems to mark the beginning of a long-term trend of diminishing
<br />flows at Julesburg. The 1941-1950 period is the only period following 1930
<br />that exceeded the 1912-1930 flow, and this was primarily because of 1942 which
<br />was the highest flow year of record.
<br />
<br />3. Flow at Julesburg hus decreased from the 14-year
<br />implementation of the South Platte River Compact in 1923.
<br />the Compact on the slate 1 lne runoff is not clear from the
<br />probably overshadowed by other factors.
<br />
<br />period prior to
<br />The effect of
<br />diagram and is
<br />
<br />4. The effect of heavy pumping of the South Platte alluvium since the
<br />early 1950's on the flow at Julesburg has combined with the effect of the
<br />1954-1956 drouth to sharply turn the line to the right. The 1 ine swings up-
<br />ward again with the advent of the C-BT Project and the end of the drouth. to
<br />a rate higher than the long-term average, but less than the pre-Compact
<br />period. Indications point towards the Jule<;burg flow just holding Its own.
<br />
<br />5. The importat ion of west slope water with attendant carry-over storage
<br />facilities combined vdth the development of storage within the basin has helped
<br />to stabi] ize the water supply, resulting in a higher level of water use. A
<br />major factor influencing water use has been the rapid population growth of the
<br />metropolitan Denver area and of other communities in the South Platte Basin.
<br />This grovlth [<; shown in the following table.
<br />
<br />POPULATION GROWTH IN THE SOUTH PLATTE RIVER BASIN
<br />
<br />County
<br />(I)
<br />
<br />1900
<br />(2)
<br />
<br />140,500
<br />6,150
<br />3,120
<br />9,306
<br />6,200
<br />4,100
<br />12,168
<br />3,268
<br />16,808
<br />3.292
<br />971
<br />
<br />205,883
<br />
<br />Denver
<br />Boulder
<br />Dougl as
<br />Jefferson
<br />Arapahoe
<br />Adams
<br />Larimer
<br />Morgan
<br />Weld
<br />Logan
<br />Sedgwi ck
<br />
<br />Total
<br />
<br />% Increase in Total
<br />
<br />Relative Annl.
<br />Water Use in
<br />Acre-Feet at
<br />100 gpcd
<br />
<br />23.000
<br />
<br />Relative Annl.
<br />Depict Ion In AF
<br />
<br />10,000
<br />
<br />1920
<br />(3)
<br />
<br />256.491
<br />11,006
<br />3,517
<br />14,400
<br />13,766
<br />14.430
<br />27,872
<br />16,124
<br />54,059
<br />18,427
<br />1,,207
<br />
<br />434,299
<br />
<br />110
<br />
<br />48,500
<br />
<br />24,000
<br />
<br />1940
<br />(1+)
<br />
<br />322,416
<br />12,958
<br />3,496
<br />30,725
<br />32,150
<br />22,481
<br />35,539
<br />17,214
<br />63.7"7
<br />18,370
<br />5,294
<br />
<br />56'+. 390
<br />
<br />30
<br />
<br />63,000
<br />
<br />30.000
<br />
<br />1950
<br />(5)
<br />
<br />415,786
<br />19.999
<br />3,507
<br />55,687
<br />52,125
<br />40,234
<br />43,554
<br />18,074
<br />67,504
<br />17,187
<br />5.095
<br />
<br />1960
<br />(6)
<br />
<br />493,887
<br />37,718
<br />4,816
<br />127.520
<br />113,426
<br />120,296
<br />53,343
<br />21,192
<br />]2,344
<br />20,302
<br />4,242
<br />
<br />1964
<br />(])
<br />
<br />524,000
<br />46,000
<br />5,700
<br />170,000
<br />137,000
<br />151,500
<br />63,000
<br />21,300
<br />77.500
<br />20,600
<br />4,250
<br />
<br />737,752 1,069.086 1,220,850
<br />
<br />82,600
<br />
<br />40,000
<br />
<br />3 I
<br />
<br />120,000
<br />
<br />60,000
<br />
<br />45
<br />
<br />14
<br />
<br />137,000
<br />
<br />68,000
<br />
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