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Encyclopedia > Water balance

Note: The Water Balance method is a winding mechanism used in mining

In hydrology, the water balance is an equation which describes how water can be accounted for within a drainage basin. An equation is a mathematical statement, in symbols, that two things are the same. ... A drainage basin is the area within the drainage basin divide (yellow outline), and drains the surface runoff and river discharge (blue lines) of a contiguous area. ...

The equation is P = Q + E ± S


P= Precipitation

Q= Runoff

E= Evapotranspiration

S= Storage (in soil or the bedrock)

The water balance can be used to manage water supply and suggest where there may be water shortages. It is also used in irrigation, flood control and pollution control. High-altitude aerial view of irrigation in the Heart of the Sahara ( ) Irrigation is the replacement or supplementation of rainfall with water from another source in order to grow crops or plants. ...

The water balance can be illustrated using a water balance graph which plots levels of precipitation and evapotranspiration often on a monthly scale. Evapotranspiration (ET) is the sum of evaporation and plant transpiration. ...

Several Monthly Water Balance Models had been developed for several conditions and purposes. Monthly Water Balance Models had been studied since the 1940s [1] Evaluate the components of the hydrologic cycle Snowmelt simulation Climate change impact assessment Flow forecasting and project design Models using precipitation (rainfall) as input Models using rainfall and temperature as input Models using rainfall and potential evaporation as input...

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