1. Water Resource Monitoring for Assessment and Adaptation to Droughts: California Central Valley and Africa Nile Basin Norman Miller 1, Charles Brush 2, Hans-Peter Plag 3, James Famiglietti 4 1 University of California, Berkeley 2 California Department of Water Resources 3 University of California, Irvine 4 University of Nevada, Reno IGCP 565 Meeting Johannesberg, South Africa 22 November 2011

2. Three feasibility elements that we propose during the Phase I project: Element 1: Improved water resource monitoring through constraints from gravity and surface displacements; Element 2: Improved decision support through advanced web-based utility; Element 3: Demonstration, Feasibility decisions and Recommendations

3. California Drought Simulation

4. California Drought Monitoring

6. Element 1 Tasks: T1.1: Implement the assimilation of gravity-based constraints on water mass and terrestrial water storage T1.2: Implement the assimilationj of surface- displacements as additional constraints on water mass changes T1.3: Evaluate/Validate prototype based on historic droughts, 2004-2010, and projected scenarios

7. Element 2: Improved decision support through advanced web-based utility T2.1: Improved design of current decision support tools T2.2: Implementation of a web-based advanced decision support utility for water resource management

8. Element 3: Demonstration, Feasibility decisions and Recommendations T3.1: Operate prototype under real-life conditions T3.2: User study of prototype T3.3: Prepare feasibility decision and make recommendations for phase 2

9. Anticipated Results/Impacts A prototype of an improved decision support tool for water resource management that provides actionable information; Improved support for decision-making concerning water resource management, water allocation, and long-term water resource planning. We anticipate that quantitatively, the new decision making tool will increase the accuracy of subsurface water masses by at least a factor of two. Recommendations for an operational system for the Central Valley; recommendations for a pilot study in the Nile River Basin.