4Supp%204%20water%20budgets

4Supp%204%20water%20budgets - A water budget is an attempt...

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Water Budgets A water budget is an attempt to “follow the water” or account for the movements and transformations of water in a watershed or region.
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Input (precipitation, groundwater inflow) Storage (soil, Surface waters Groundwater) Output (evapotranspiration streamflow, groundwater outflow) Mass Balance: Input – Output = Change in Storage
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Physical Hydrology , Dingman 2002 Major terms of a water budget Precipitation and stream flow are routinely measured in many areas, reported in inches (or mm) and cubic feet per second (or cubic meters per second) Evapotranspiration is measured in a few places and can be estimated from meteorological data. It may be reported in a range of units, including watts per square meter. Changes in storage are not routinely reported but can be estimated from changes in lake levels, changes in soil moisture, etc. Continued…
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Terms of a water balance, continued Groundwater flows are measured in a few places, based on monitoring wells, tracer studies and flow models. Results are not routinely reported and may be reported in
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4Supp%204%20water%20budgets - A water budget is an attempt...

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