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Overview of Conservation Options in the Colorado River Basin Water Supply & Demand Study WEAN-CRB Webinar January 9, 2013. Study Objective Assess future water supply and demand imbalances over the next 50 years Develop and evaluate opportunities for resolving imbalances - PowerPoint PPT Presentation
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Overview of Conservation Options in the Colorado River Basin Water Supply & Demand Study
WEAN-CRB WebinarJanuary 9, 2013
• Study Objective– Assess future water supply and
demand imbalances over the next 50 years
– Develop and evaluate opportunities for resolving imbalances
• Study conducted by Reclamation and the Basin States, in collaboration with stakeholders throughout the Basin
• Began in January 2010 and to be completed in December 2012
• A planning study – does not result in any decisions, but provides the technical foundation for future activities and dialogue
Colorado River Basin Water Supply and Demand Study
Summary of Options Submitted
• Over 150 options were submitted to the Study• All options received were included and are reflected in the Study
Increased Supply – reuse, desalination, importation, etc.
Reduced Demand – M&I and agricultural conservation, etc.
Modify Operations – transfers & exchanges, water banking, etc.
Governance & Implementation – stakeholder committees, population control, re-allocation, etc.
Reduce Demand OptionsExamples of Submitted Options
• Municipal & Industrial Conservation– Water audits– Inclining block rates– Xeriscaping– Residential and
commercial retrofits– Pool covers– Gradual decreases in
water demand over time– Publication and awareness
campaigns
• Agricultural Conservation– Conveyance system
efficiency– On-farm irrigation
efficiency– Improved irrigation
management– Controlled environment
agriculture– Reductions in consumptive
use
• Options related to Energy Water Use Efficiency were also included in this category
Future Water Demand Scenarios
0
5
10
15
20
25
1970 1980 1990 2000 2010 2020 2030 2040 2050 2060
Mill
ion
Acr
e-Fe
et p
er Y
ear
Year
<-- Historical Projected->
*Quantified demand scenarios have been adjusted to include Mexico's allotment and estimates for future reservoir evaporation and other losses.
Historical Use
Delivery to Mexico
Reservoir Evaporation
Other Losses
Current Projected (A)*
Delivery to MexicoReservoir Evaporation
Other Losses
Slow Growth (B)*Rapid Growth (C1)*Rapid Growth (C2)*Enhanced Environment (D1)*Enhanced Environment (D2)*
Colorado River Basin Historical Use and Future Projected Demand
Development of Representative Options: Municipal & Industrial Conservation• 3 representative options, reflecting 3 levels of additional
conservation at a Basin-wide level, were developed• Conservation amounts were determined for Residential Indoor;
Commercial, Institutional and Industrial; Outdoor Landscaping; and Water Loss – Best Management Practices and adoption rates derived from state of
Colorado and California approaches were used to determine amounts
TABLE F-3 Reductions in Colorado River Basin Demand (afy) for Each Demand Scenario and Conservation Level at 2060
Conservation Level
Current Projected
(A)
Slow Growth
(B)
Rapid Growth
(C1)
Rapid Growth
(C2)
Enhanced Environment
(D1)
Enhanced Environment
(D2)
Savings Assumed in Demand Scenarios
478,000 296,000 621,000 1,048,000 1,052,000 1,114,000
Additional Savings from M&I Conservation
Level 1 185,000 187,000 207,000 56,000 44,000 55,000
Level 2 576,000 504,000 681,000 427,000 238,000 383,000
Level 3 1,051,000 888,000 1,258,000 960,000 654,000 908,000
Ratings Summary for M&I Conservation Representative Options
Development of Representative Options: Agricultural Conservation
• 2 representative options, reflecting 2 implementation approaches at a Basin-wide level, were developed
• The implementation approaches considered are agricultural conservation with and without transfers, up to 1 MAF for each approach was evaluated (not additive)
• Each approach is comprised of a blend of conservation measures
TABLE F-6 Estimated Potential Water Savings at the Farm Scale for Each Agricultural Water Conservation Measure
Water Conservation Measure
Reduction in Consumptive Use
(af)
Reduction in Total Diversion
(af)
Advanced Irrigation Scheduling 0 270,000
Deficit Irrigation 100,000 130,000
On-Farm Irrigation System Improvements 0 490,000
Conveyance System Efficiency Improvements 0 820,000
Controlled Environment Agriculture 13,000 13,000
Irrigated Lands Fallowing 720,000 720,000
TOTAL 833,000 2,443,000
Ratings Summary for Agricultural Conservation Representative Options
Role of Conservation in Study Portfolios
• Four portfolios (groups of options) were evaluated in the Study designed to reflect differing strategies towards resolving future imbalances
• M&I conservation was frequently implemented and with a short delay from its first availability date under all future conditions– This is also true for the first levels of agricultural conservation
(with transfers)
• Higher levels of agricultural conservation (with transfers) were frequently implemented and with a short delay from their first availability date under only future conditions with low streamflow
Next Steps Regarding Conservation
• Conservation in both the M&I and the agricultural sectors is an area that municipalities and entities in the agricultural sector have been and will continue to pursue
• Local differences in conservation potential is an uncertainty that needs to be explored
• Convened by Reclamation, workgroups will be established in 2013 that include the Basin States and other interested stakeholders to further explore conservation opportunities
Study Contact Information• Website: http://www.usbr.gov/lc/region/programs/crbstudy.html• Email: ColoradoRiverBasinStudy@usbr.gov• Telephone: 702-293-8500; Fax: 702-293-8418
Colorado River Basin Water Supply and Demand Study
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