ColoradoBasinWaterSupplyandNeedsReport

• Basin Roundtable: Colorado
• Title: Water Supply & Needs Report for the Colorado Basin
• Date: 5/1/2006
• Basin Roundtables - Doc Type: Needs Assessment Documents

Colorado Basin Water Supply
and Needs Report
IJ IIII

4.2.3 Changes of Water Rights......................................................................................... 4-4

4.2.4 Leases of Water....................................................................................................... 4-5

4.2.5 Augmentation Plans................................................................................................. 4-5

4.2.6 I nstream Flows......................................................................................................... 4-6

4.2.7 New Appropriations.................................................................................................. 4-7

4.2.8 Groundwater Rights................................................................................................. 4-7

4.2.9 Reuse....................................................................................................................... 4-8

4.2.10 Conservation Activities............................................................................................. 4-8
4.3 Interstate Compacts, Equitable Apportionment Decrees, and Memoranda of

U nd erstand i ng . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-9

4.3.1 Colorado River Com pact of 1922 ............................................................................. 4-9
4.3.2 Upper Colorado River Basin Compact of 1948 ........................................................ 4-9
4.3.3 Rio Grande, Colorado, and Tijuana Treaty of 1944 Between the U.S. and

Mexico.................................................................................................................... 4-10

Section 5 Consumptive Water Supply Needs in the Colorado Basin

5.1 Overview of Projection Methods............................................................................................... 5-1
5.1.1 Method for Estimating Municipal and Industrial Use ................................................ 5-2
5.1.1.1 Overview of Method for Estimating M&I Use .......................................... 5-2
5.1.1.2 Population Projections............................................................................ 5-3
5.1.1.3 Estimates of Per Capita M&I Water Use................................................. 5-3
5.1.1.4 Self-Supplied Industrial Use ...................................................................5-5
5.1.1.5 Effect of Level 1 Conservation................................................................ 5-5
5.1.1.6 Estimate of M&I CU Rates...................................................................... 5-6
5.1.1.7 Existing Agricultural Demands Method ...................................................5-6
5.1.1.8 Future Agricultural Demands Method .....................................................5-7
5.2 Estimated 2000 and Projected 2030 M&I and SSI Use............................................................. 5-9
5.3 Projected 2030 Agricultural Demand...................................................................................... 5-10

Section 6 Non-Consumptive Water Supply Needs in the Colorado Basin

6.1 Concepts for Environmental Flow Management .......................................................................6-1
6.2 Recreational and Environmental Information ............................................................................ 6-1
6.2.1 Flow Considerations................................................................................................. 6-1
6.2.2 Water Based Recreation.......................................................................................... 6-5
6.2.3 Upper Colorado River Basin Study........................................................................... 6-9

Section 7 Availability of Existing Water Supplies in the Colorado Basin

7.1 Methods and Tools Employed to Evaluate Surface Water Supply Availability.......................... 7-1
7.2 Overview of Groundwater Supplies and Availability.................................................................. 7-1
7.2.1 Defi nition of G rou ndwater Resou rces....................................................................... 7-1
7.3 Available Surface Water and Alluvial Groundwater Supply....................................................... 7-2
7.3.1 Surface Water Supplies .......................................................................................... 7-5

7.3.2 Alluvial Aquifer .......................................................................................... 7-6

7.4 Availability for Water Supply Development under Interstate Compacts and Decrees............. 7-17

CDIVI

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