Climate change impacts on water management in the state of Washington
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1 Climate change impacts on water management in the state of Washington Julie Vano A,B Nathalie Voisin B Michael Scott C Lan Cuo A,B Marketa McGuire Elsner B Alan Hamlet A,B Kristian Mickelson B Richard Palmer B,D Austin Polebitski B,D Claudio Stockle E Dennis Lettenmaier A,B A Climate Impacts Group B Dept of Civil and Environmental Engineering, U of Washington C Pacific Northwest National Laboratory, Richland, WA D Dept of Civil and Environmental Engineering, U of Massachusetts-Amherst E Dept of Biological Systems Engineering, Washington State University February 12, 2009 Washington State Climate Change Impacts Assessment Conference Climate science in the public interest
2 Objectives 1) Providing information for future projections relevant (time and location) to water resource decisions Hydrology talk - Marketa McGuire Elsner 2) Accounting for how these projections impact system operations - an informed sensitivity analysis Water Management talk - Julie Vano 3) Exploring how planning and management can account for future uncertainties and climate impacts Panel discussion Photo courtesy of
3 Washington Water Resources April 1 Snow-Water Equivalents (A1B) x Case study 1: Yakima R basin irrigated agriculture Case study 2: Puget Sound basin municipal
4 Case study 1: Yakima River Basin Irrigated crops largest agriculture value in the state Precipitation (fall-winter), growing season (spring-summer) Five USBR reservoirs with storage capacity of ~1 million acre-ft, ~30% unregulated annual runoff Snowpack sixth reservoir Water-short years impact water entitlements
5 Yakima Basin Methods
6 Yakima River Basin Unregulated
7 Yakima River Basin Unregulated Basin shifts from snow to more rain dominant
8 Yakima River Basin management model Unregulated Regulated Basin shifts from snow to more rain dominant
9 Yakima River Basin Basin shifts from snow to more rain dominant Water prorating, junior water users receive 75% of allocation
10 Yakima River Basin 2080s 2020s historical Basin shifts from snow to more rain dominant Water prorating, junior water users receive 75% of allocation Junior irrigators less than 75% prorating (current operations): 14% historically 32% in 2020s A1B (15% to 54% range of ensemble members) 36% in 2040s A1B 77% in 2080s A1B
11 Crop Model - Apple Yields Tons/Acre Tons/Acre Sr. Irrigators Jr Irrigators 5 0 No CO2 CO2 No CO2 CO2 No CO2 CO2 No CO2 CO2 No CO2 CO2 No CO2 CO2 A1B B1 A1B B1 A1B B1 Historical Scenario Yields decline from historic by 20% to 25% (2020s) and 40% to 50% (2080s)
12 Crop Model - Apple Yields Tons/Acre Tons/Acre Sr. Irrigators Jr Irrigators 5 0 No CO2 CO2 No CO2 CO2 No CO2 CO2 No CO2 CO2 No CO2 CO2 No CO2 CO2 A1B B1 A1B B1 A1B B1 Historical Scenario Yields decline from historic by 20% to 25% (2020s) and 40% to 50% (2080s) Yields less impacted with CO 2 fertilization effects Similar impacts for cherry producers
13 Economics - Production Value Cherries Thousand 2007$ $500 $450 $400 $350 $300 $250 $200 $150 $100 $50 $0 Historical A1B 2020s B1 2020s A1B 2040s B1 2040s A1B 2080s B1 2080s Apples Conditions ( ) 2020s 2040s 2080s Junior and senior water user, impacts with CO 2 fertilization Production decreases by 5% in 2020s, 16% in 2080s. Production values are buffered somewhat by price increases and largely unchanged production on senior water user lands
14 Key Findings Yakima River Basin 1) Future projections indicated that reservoir system will be less able to supply water to all users, especially those with junior water rights 2) Earlier and shorter growing season - apples 12 days earlier, cherries 22 days earlier season start, month earlier harvest 3) Yields decline - under A1B emissions scenario, average apple and cherry yield are likely to decline by 20% to 25% (2020s) and 40% to 50% (2080s) for junior water holders 4) Crop values decline - value of apple and cherry production is likely to decline by 5% ($20 million) in 2020s,16% ($70 million) in the 2080s
15 Case study 2: Puget Sound Basin Precipitation in fall-winter, water demand in summer Water management systems: Seattle - municipal, fish Tacoma - municipal, flood control Everett - municipal, hydropower Reservoir capacities small relative to annual flow
16 Puget Sound Methods
17 Puget Sound Basin Seattle Tacoma Everett Variations in impacts within and between systems (A1B) Seattle, M&I and environmental flows Tacoma, flood control, more constrained storage Everett, hydropower, more interannual variability
18 Puget Sound Basin municipal supply - current demand M&I reliability measures, differ for all systems Current demand, reliability little impact from future change (A1B) Tacoma, water allocations closer to current system capacity Everett, largest system capacity Note: simulations prior to adaptations 100% 80% 60% 40% 20% 0% Current Demand 1% 7% 0% historic 2020s 2040s 2080s Seattle M&I Tacoma FDWR Everett M&I
19 With demand increases, climate change has more impact reliability Importance of conservation measures/reduced demand Systems respond different depending on storage capacity, basin transitions, system demands, adaptive capacity Note: simulations prior to adaptations Puget Sound Basin municipal supply - changing demand Seattle M&I Reliability 100% 80% 60% 40% 20% 0% historic 2020s 2040s 2080s 1% 5% 23% 36% current demand 110% 125% 150% Tacoma FDWR Reliability 100% 80% 60% 40% 20% 0% Everett M&I Reliability 100% historic 2020s 2040s 2080s 7% 9% 9% 10% current demand 110% 125% 150% 0% diff, all 100%
20 Puget Sound Basin operations beyond municipal supply Range of operating goals that must be balanced Tacoma, likelihood of flood control years Tacoma, minimum instream flow reliability Note: current demand and simulations prior to adaptations Tacoma Likelihood of Flood Control Years 100% 80% 60% 40% 20% 0% current demand Tacoma MIF at Palmer Reliability 100% 80% 60% 32% diff historic 2020s 2040s 2080s 40% 20% 36% diff 0% current demand
21 Puget Sound Basin operations beyond municipal supply Seattle environmental flows Tacoma flood control Everett hydropower Reservoir storage projected to be lower in late spring through early fall and ancillary operating objectives may be impacted.
22 Key Findings Puget Sound Basin 1) Primary impacts of climate change will be a shift on average in the timing of peak river flow from late spring to winter 2) With current demands, systems able to accommodate changes from future climate 3) With demand increases, systems less able to accommodate changes from future climate, conservation measures matter 4) Other aspects of system performance complicate management decisions such as environmental flows, flood control, and hydropower Photo courtesy of
23 Ongoing and Future Adaptations through Washington State Expand and diversify existing water supplies Develop new or alternate water supplies Reduce demand/improve efficiency Implement operation changes Increase ability to transfer water between uses and users Increase drought preparedness Reduce winter flood impacts
24 Acknowledgements Chris Lynch, US Bureau of Reclamation, Yakima Project Lance Vail and Andre Coleman, Pacific Northwest National Lab Seattle Public Utilities Tacoma Water US Army Corps of Engineers, Howard Hanson Project City of Everett Snohomish County Public Utility District The Climate Impacts Group Julie Vano
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