Defines the sources and uses of water in an area and ensures they are in balance.

A water budget takes into account:

• Supplies (groundwater, imported, recycled)
• Demands (municipal, institutional, industrial, agricultural consumption)
• Basin Water Balance Components
• Changes in storage over time
• Population growth
• Land use (urban, agricultural)
• Hydrologic conditions (rainfall, streamflow, groundwater levels)
• Climate change