GunnisonBasinWaterSupplyandNeedsReport

• Basin Roundtable: Gunnison
• Title: Water Supply & Needs Report for the Gunnison Basin
• Date: 6/1/2006
• Author: CDM
• Basin Roundtables - Doc Type: Needs Assessment Documents

Gunnison Basin Water Supply
and Needs Report
'.IlL

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 Instream 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

Understanding................................................................................................................. .......... 4-9

4.3.1 Colorado River Compact 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 Gunnison 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 Gunnison 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 .......................................................................................... 6-6

Section 7 Availability of Existing Water Supplies in the Gunnison 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 Definition of Groundwater Resources....................................................................... 7-1
7.3 Available Surface Water and Alluvial Groundwater Supply....................................................... 7-3
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............. 7-16

CONI

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S:\1177\Basin Reports\Gunnison\TOC_Gunnison.doc