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<br />Arkansas Basin
<br />Growth
<br />
<br />The Arkansas Basin is
<br />comprised of all or part of
<br />18 counties. Changes in
<br />population from 2000 to
<br />2030, including percent
<br />annual growth rate on a
<br />subbasin level, are shown in
<br />the table here. During that
<br />time, the population in the
<br />basin is expected to grow by
<br />almost half a million people,
<br />or 55 percent.
<br />
<br />Arkansas Basin Population Projections
<br />
<br />Arkansas River Basin
<br />
<br />
<br /> Increase in Percent Percent
<br /> Population Change Annual
<br /> 2000 2030 2000 to 2000 to Growth
<br />Subbasin Designation Population Population 2030 2030 Rate
<br />Upper Arkansas 85,000 146,400 61,400 72 1.8
<br />Urban Counties 662,600 1,028,000 365,400 55 1.5
<br />Lower Arkansas 46,200 52,100 5,900 13 0.4
<br />Eastern Plains 18,200 29,900 11,700 64 1.7
<br />Southwestern Arkansas 23,100 36,600 13,500 58 1.5
<br />TOTAL 835,100 1,293,000 457,900 55 1.5
<br />
<br />Arkansas Basin
<br />Water Demands
<br />
<br />Arkansas Basin Demand Projections
<br />
<br /> Identified
<br /> Projected Increase in Gross
<br /> 2000 Gross 2030 Gross Conservation Gross Demand
<br /> Demand Demand Savings Demand Shortfall
<br />Subbasin Designation (AF) (AF) (AF) (AF) (AF)
<br />Upper Arkansas 22,700 36,400 2,400 13,700 6,600
<br />Urban Counties 212,900 292,800 14,500 79,900 8,000
<br />Lower Arkansas 12,200 13,000 900 800 800
<br />Eastern Plains 4,300 5,500 300 1,200 1,200
<br />Southwestern Arkansas 4,800 7,200 500 2,400 500
<br />TOTAL 256,900 354,900 18,600 98,000 17,100
<br />
<br />Following the South Platte
<br />Basin, the Arkansas Basin is
<br />projected to experience the
<br />largest increase in municipal
<br />and industrial (M&I) and self-
<br />supplied industrial (SSI) water
<br />demand by 2030, for an
<br />increase of 98,000 acre-feet
<br />(AF). M&I is defined as all of
<br />the water use of a typical
<br />municipal system, including
<br />residential, commercial,
<br />industrial, irrigation, and
<br />firefighting. Large industrial
<br />water users that have their own water supplies or
<br />lease raw water from others are described as SSI
<br />water users. M&I and SSI water demand forecasts for
<br />the Arkansas Basin are shown in the table above.
<br />
<br />Water use can be considered both in terms of gross
<br />water needs or demands-the total amount of water
<br />delivered to a user-and in consumptive use (CU), or
<br />the water that will actually be consumed. The 2000
<br />and 2030 gross demands are presented in the table,
<br />along with the projected conservation savings.
<br />Conservation practices include ordinances and
<br />standards that improve the overall efficiency of
<br />water use, such as installation of low water-use
<br />plumbing fixtures. As the table indicates, the
<br />Arkansas Basin will need an additional 98,000 AF to
<br />meet the increased demands of M&I water use. The
<br />majority of the demand is expected to be met
<br />through existing supplies and water rights and
<br />through the implementation of various projects and
<br />processes. However, there are still some anticipated
<br />shortfalls expected in certain portions of the basin.
<br />This is also shown in the table.
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<br />
<br />Wet and Dry Periods
<br />
<br />Every year, there is at least one lOa-year flood
<br />somewhere in the state. Colorado's total flood losses
<br />to date have been documented to be $4.9 billion.
<br />The Arkansas Basin's most recent flood event was
<br />April 29-May 3, 1999. The estimated total historic
<br />damages for this basin are $1.3 billion to date.
<br />
<br />
<br />. Irrigation
<br />. Storage
<br />o Municipal
<br />DCommercial
<br />. Domestic
<br />o Stock
<br />. Industrial
<br />o Recreation
<br />. Fishery
<br />.Augmentation
<br />o Recharge
<br />
<br />Source: Colorado Division of Water Resources, Cumulative Yearly Statistics of the
<br />Colorado Division of Water Resources, 1999-2004
<br />
<br />
<br />-==-
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<br />May-June 1935
<br />Kiowa, Bijou,
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<br />ment Creeks flood
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<br />June-July 1957
<br />Basin floods
<br />
<br />June 1965
<br />
<br />Dry Avg Wet
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<br />June & Aug 1921
<br />Basin floods
<br />
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<br />Source: Colorado Water Conservation Board; and McKee, Doesken, and Kleist, Historical Dry and Wet Periods in Colorado, Figures,
<br />Colorado Climate Center, Colorado State University, 1999.
<br />
<br />Fall at Ruby (photo courtesy of Colorado State Parks)
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