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The Water Balance
Water balance is worked out from inputs and outputs.

The water balance affects how much water is stored in the basin.



The balance between water inputs and outputs of a drainage basin may be shown as a
water budget graph.

It is expressed as follows:

P =…

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Soil moisture

Surplus: If precipitation exceeds evapotranspiration and the excess is not been used by
plants

Deficiency: Evapotranspiration exceeds precipitation

Recharge: Replacement of water lost during drier periods

Field capacity

The maximum amount of water soil can hold.

A water surplus can result in wet soils, high river levels and…

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