global water budget

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water budget, global The amount of water involved in the hydrological cycle each year. Average annual precipitation over the whole globe is about 86 cm, of which 77% falls on the oceans and 23% on land. Evaporation (including transpiration by plants) from the land accounts for 16% of the total precipitation it receives, and 7% of global precipitation returns to the sea as river and groundwater flows.

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global water budget See WATER BUDGET, GLOBAL.