CALIFORNIA'S FOOD, ENERGY, AND WATER SYSTEMS (FEWS) ARE INTERDEPENDENT AND INCREASINGLY STRESSED BY GROWTH IN RESOURCE DEMANDS, ENVIRONMENTAL POLICIES, AND SEVERE AND PERSISTENT DROUGHT. CALIFORNIA THEREFORE REPRESENTS A CRITICAL OPPORTUNITY TO LEARN HOW TO MODEL, MONITOR, AND JOINTLY MANAGE THESE SYSTEMS UNDER STRESS.WE WILL INTEGRATE METHODS FROM GEOSCIENCES, ENGINEERING, AND ECONOMICS TO MODEL IMPORTANT INTERACTIONS AMONG THE FEWS AT A LEVEL OF SPATIAL, TEMPORAL, AND MECHANISTIC DETAIL THAT WILL ADVANCE OUR UNDERSTANDING AND THEREBY INFORM FUTURE DECISIONS REGARDING RESOURCE MANAGEMENT IN CALIFORNIA AND ELSEWHERE. THIS PROPOSAL INTEGRATES THREE MAIN OBJECTIVES:1. WE WILL USE SPATIAL ECONOMETRIC ANALYSIS TO ESTIMATE HISTORICAL ELASTICITY OF WATER DEMAND AMONG DIFFERENT WATER RIGHTS HOLDERS, FARMER RESPONSES IN THE ABSENCE OF STRICT GROUNDWATER REGULATION, AND PRIORITIES OF RESERVOIR OPERATION.2. WE WILL BUILD AN INTEGRATED MODELING FRAMEWORK REPRESENTING ALL THREE SYSTEMS AS THEY NOW EXIST IN ORDER TO MEASURE THEIR INTERDEPENDENCE AS THEY HAVE BEEN RECENTLY MANAGED.3. WE WILL MODEL FUTURE SCENARIOS TO TEST SENSITIVITIES AND IDENTIFY CRITICAL LEVERAGE POINTS WHERE POLICY AND TECHNOLOGY COULD MOST EFFICIENTLY AND EFFECTIVELY PROMOTE RESILIENCE AND SUSTAINABILITY ACROSS THE SUPER-SYSTEM OF FOOD, ENERGY AND WATER.THIS WORK WILL DRAMATICALLY ADVANCE UNDERSTANDING OF FEWS THROUGH NEW INDICATORS AND GENERALIZABLE MODELING THAT IS EXPANSIVE, DETAILED, AND INFORMED BY CAREFUL OBSERVATIONS. OUR APPROACH IS NECESSARILY INTERDISCIPLINARY, AND OUR TEAM INCLUDES LEADERS AND EARLY CAREER SCIENTISTS FROM DIFFERENT FIELDS WITH DEMONSTRATED STRENGTH IN INTERDISCIPLINARY SYSTEMS ANALYSIS.