4.0 Water supply
Overview - water supply dams and planning
Planning for domestic and agricultural water supply requires consideration of a multitude of land-use and socioeconomic factors. This module only considers a few of these factors through activities which engage the user to determine an objective safe (or firm) municipal water supply yield. Among other factors, analysis of dam design and reservoir operations must also estimate appropriate conservation pool volumes to meet both the firm yield and seasonal variability in municipal demand and irrigation demand.
Much of the development of water systems in the Western U.S. occurred in support of the federal government's efforts to encourage irrigation and development in the then sparsely populated region. While Folsom dam was initially authorized for flood control in 1944, during the planning stages Congress expanded authorization to include municipal and agricultural water supply (and hydropower production). Folsom operates as part of the Central Valley Project (CVP), an extensive network of dams, reservoirs, canals, powerplants and pumping plants that extends from northern to southern California to serve the state's water and power needs.