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Section 5
<br />Projected Water Use
<br />Table 5-5 Breakdown of Potential 2030 Chanqes in
<br />~I Decrease I in
<br />17,000-59,000 2,300-4,500 4,000-8,000 -
<br /> Decrease
<br />Colorado 1,200-2,700 6,700-13,000 - - 7,900-16,000
<br /> Decrease
<br />Dolores/ San Juan/ 100-200 1,500-3,100 - 2,000-4,000 1,300 Decrease up
<br />San Miguel to 2,400 Increase
<br />Gunnison 300-1,500 2,200-8,500 - - 2,500-10,000
<br /> Decrease
<br />North Platte No significant No significant No significant No significant -
<br /> change expected change expected change expected change expected
<br />Rio Grande 600-1,100 100-200 59,000-99,000 - 60,000-100,000
<br /> Decrease
<br />South Platte 40,000-79,000 38,000-57,000 55,000-90,000 - 133,000-226,000
<br /> Decrease
<br />Yampa/VVhite/ Green 100-200 1,100-2,400 - 0-40,000 2,600 Decrease up
<br /> to 39,000 Increase
<br />TOTAL 59,000-144,000 52,000-89,000 118,000-197,000 2,000-44,000 185,000-428,000
<br /> Decrease
<br />As noted, reductions in agricultural irrigated acres may
<br />occur due to development, acquisition for M&I needs,
<br />dry-up for instream flow purposes, or as a result of lack
<br />of long-term supply availability such as lack of
<br />augmentation for well pumping or over pumping of
<br />groundwater. As described in Section 8, not all of the
<br />reduction in agricultural irrigated acres will result in
<br />additional supplies available for M&I or other uses. In
<br />addition, not all of the development of irrigated
<br />agricultural lands for M&I use will result in a reduction of
<br />irrigation demands. Some of the
<br />development of agricultural irrigated Multi-Family
<br />acres will be for large lot residential
<br />Single-Family Medium
<br />development of 1 to 5 acres or Density
<br />ranchettes of 5 to 35 acres. For many of o Single-Family Low
<br />these parcels, if the water rights are not w Density
<br />R
<br />sold and transferred at the time of a Public Parks
<br />~
<br />development, there may be some ~
<br />continued irrigation for hay or pasture for ~ Employment District
<br />domestic animals kept on the properties. comme~~~a~
<br />Basin Roundtable feedback was mixed
<br />on whether new residential owners would Industrial
<br />tend to irrigate as diligently as the former
<br />rancher or farmer and whether overall
<br />water demands would change as a result
<br />of this new land use.
<br />J~~a
<br />$~ole'ri~ice Wo~e' $upplY Initia~ive
<br />Typical water use per acre for different types of M&I land
<br />use development in the South Platte Basin are shown in
<br />Figure 5-6. Generally, as residential densities increase,
<br />the gross water use per acre also tends to increase.
<br />Figure 5-6 shows that average gross water use can
<br />range from 1.3 AF/acre for industrial use to 3.5 AF/acre
<br />for higher density residential uses, such as apartments.
<br />Agricultural water deliveries and consumptive to
<br />historically irrigated lands vary widely and are dependent
<br />upon seniority of water rights, physical availability of
<br />Annual Water Use in AF/acre
<br />Source: Cities of Wesfininster and Greeley and NCWCD
<br />Figure 5-6
<br />Estimated Gross Urban Water Demands by Land Use
<br />(Indoor and Outdoor Use)
<br />C~A
<br />S:\REPORT\WORD PROCESSING\REPORT\SS 11-7-04.DOC 5-11
<br />0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
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