A water budget is derived from measuring system inputs of precipitation and system outputs of evapotranspiration and runoff.

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A water budget is a method of accounting for the water that enters and leaves a specific system, such as a watershed or ecosystem. It involves measuring inputs of precipitation and outputs of evapotranspiration (the combination of evaporation from surfaces and transpiration from plants) and runoff (water that flows over the surface or through the soil to streams or other water bodies). By comparing inputs and outputs, a water budget can help to understand the hydrological cycle and how water is being used in a specific system.

A Water Budget Is Derived from Measuring System Inputs of Precipitation