California never has enough water to meet all demands and even when supplies are relatively robust there’s a triangular competition over their allocation. Farmers, municipal users and environmental advocates vie for shares of water that has been captured by California’s extensive network of dams and reservoirs. Their battles are waged in the state Capitol, in Washington, in regulatory agencies and in the courts and over time, the trend has been a subtle shift of supplies from long-dominant agriculture to protecting flows for fish and other wildlife while maintaining the relatively small amount consumed in urban areas.