Final Draft ALP Marketing Supply and Demand Study

A-LP Water Animas -La Plata Water Marketing Supply and Demand Study Section 3
Refined Demands
Brown and Caldwell followed up with the above mentioned water providers:
• Letters to water providers who indicated no additional supplies were needed or who could not
immediately use A -LP Project water because of distance. These were sent to providers in mid -
September 2010 and to date, there has been no response.
• Telephone calls and acquiring additional information from other water providers
— Letter from La Plata Archuleta Water District which showed interest in purchasing a portion
of the State's water, up to 1,560 AF
— Water plans coming out for Lake Durango and La Plata West Water Authority. Data from
Lake Durango Water Company will not be available until the end of this year. There has
been no response from La Plata West Water Authority.
3.2 Additional Potential Water Demands
Brown and Caldwell looked at other ways that the State Water could be utilized in the study area. These
included:
• Additional Demand Due to Growth
• Potential to Serve Water Demands by Exchange
• Potential to Protect Junior Reservoirs
• Use of State Water for Compact Compliance Purposes
• Serve Additional Demands Created Because of Climate Change
3.2.1 Use of State's A -LP Water to Satisfy Additional M &I Water Demands
CWCB has updated M &I water demand projections for the State of Colorado. There have been two
studies done recently, one titled Colorado 2050 Municipal and Industrial Water Use Projections (2050
Water Use Projections, July 2010) and the second titled Draft 2050 Municipal and Industrial Gap
Analysis, (2050 Gap Analysis), September 2010. Both of these reports update the Statewide Water
Supply Initiative (SWSI) Phase 1(2004).
A significant finding of the 2050 Water Use Projections is that water usage has fallen by 18 percent in
Colorado since the publishing of SWSI. The reason for this decrease in water demand could not be
specifically identified in the investigation; however, it is attributed to enhanced conservation efforts
following the 2002 drought, the current economic downturn and improved quality of data concerning
water usage. The SWSI report estimates a water usage rate for the Dolores /San Juan /San Miguel basin
(re- titled Southwest Basin in current studies) of 220 gallons per capita per day (gpcd). The 2050 Water
Use Projection study indicates water usage for the Southwest Basin to have fallen from 220 gpcd to 183
gpcd since 2004.
The projected population growth rate in the SWSI 2004 study was 2.14 percent resulting in a total basin
population of approximately 172,000 in 2030. The 2050 Population Projection Study refined this
projection to 1.6 to 2.1 percent through 2050 with the population projected to be between 204,000 and
249,000 in the Southwest Basin.
3 -2
FINALALP Repor?_1_13_11_LL.docx