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<br />South Platte Basin
<br />Growth
<br />
<br />The South Platte Basin is
<br />comprised of all or part of
<br />23 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 2 million people, or
<br />65 percent; the fourth highest
<br />growth rate in the state.
<br />
<br />
<br />South Platte Basin Population Projections
<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 />Denver Metro 1,432,700 2,157,200 724,500 51 1.4
<br />South Metro 685,800 1,146,400 460,600 67 1.7
<br />Upper Mountain 39,200 125,300 86,100 220 3.9
<br />High Plains 24,900 28,800 3,900 16 0.5
<br />Northern 747,200 1,364,600 617,400 83 2.0
<br />Lower Platte 55,800 89,300 33,500 60 1.6
<br />TOTAL 2,985,600 4,911,600 1,926,000 65 1.7
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<br />South Platte Basin
<br />Water Demands
<br />
<br />South Platte 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 />Denver Metro 301,600 513,400 26,800 120,600 12,500
<br />South Metro 152,900 256,900 15,400 88,600 50,300
<br />Upper Mountain 9,400 29,400 1,700 17,900 1,400
<br />High Plains 9,700 11,200 700 800 -
<br />Northern 201,000 400,000 22,600 164,900 18,400
<br />Lower Platte 15,600 39,900 1,500 16,900 8,000
<br />TOTAL 690,200 1,250,800 68,700 409,700 90,600
<br />
<br />Nearly two-thirds of the
<br />increase in the state gross
<br />municipal and industrial (M&I)
<br />demand by 2030-or
<br />approximately 409,700 acre-
<br />feet (AF) - will be in the South
<br />Platte Basin. M&I is defined as
<br />all of the water use of a
<br />typical municipal system,
<br />including residential,
<br />commercial, industrial,
<br />irrigation, and firefighting.
<br />Large industrial water users
<br />that have their own water
<br />supplies or lease raw water from others are
<br />described as self-supplied industrial (SSI) water users.
<br />M&I and SSI water demand forecasts for the South
<br />Platte Basin are shown in the table above.
<br />
<br />The 2000 and 2030 gross demands are presented in
<br />the table, along with the projected conservation
<br />savings. Conservation practices include ordinances
<br />and 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 South
<br />Platte Basin will need an additional 409,700 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.
<br />
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<br />South Platte River Basin
<br />
<br />Surface Water Diversions in Acre-feet by Use
<br />
<br />(Continued from page 7/
<br />
<br />Wet and Dry Periods
<br />
<br />Every year, there is at least one I OO-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 South Platte Basin's most recent major flood
<br />event was July 28-29, 1997. The estimated total
<br />historic flood damages for this basin are $3.4 billion
<br />to date.
<br />
<br />
<br />. Water reuse and conservation are major components
<br />to meeting future water needs but this will put added
<br />pressure on agriculture as return flows diminish.
<br />
<br />. The urban landscape is very important to the
<br />economy and an important component to quality of
<br />life.
<br />
<br />. Transfers of agricultural water rights to M&I use will
<br />continue to be a significant option for meeting future
<br />needs.
<br />
<br />Source: Colorado Division of Water Resources,
<br />Cumulative Yearly Statistics of the Colorado Division of Water Resources, 1999-2004
<br />
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<br />July-Aug 1976
<br />Big Thompson and Cache
<br />la Poudre flood
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<br />Dry Avg Wet
<br />
<br />June & Sept 1933
<br />Castlewood Dam
<br />fails
<br />
<br />July 1997
<br />Fort Collins,
<br />Sterling flood
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<br />Sept 2-4, 1938
<br />Bear and Clear
<br />Creeks flood
<br />
<br />May 5-6, 1973
<br />Basin floods
<br />
<br />July 12, 1996
<br />Buffalo Creek
<br />floods
<br />
<br />Source: Colorado Water Conservation Board
<br />
<br />July 15, 1982
<br />Dam Failure,
<br />Roaring & Fall
<br />Rivers flood
<br />
<br />Bonny Reservoir (photo courtesy of Colorado State Parks)
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