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Renewable surface water produced internally

Renewable surface water produced internally

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Uploaded 16 Feb 2012 by GRID-Arendal
Year: 2009
From collection: Vital Water Graphics 2
Author: GRID-Arendal
Description:
It is difficult to determine the amount of renewable water produced internally from the total renewable water resources (external and internal). However the FAO gives a rather precise definition of this indicator. Internal Renewable Water Resources (IRWR) includes: - Average precipitation: long-term double average over space and time of the precipitation falling on the country in a year. - Surface water produced internally: long-term average annual volume of surface water generated by direct runoff from endogenous precipitation. - Groundwater produced internally: long-term annual average groundwater recharge, generated from precipitation within the boundaries of the country (estimated by the annual infiltration rate (in arid countries) or river base flow (in humid countries). - Overlap between surface water and groundwater: part of the renewable water resources common to both surface water and groundwater. It is equal to groundwater drainage into rivers (typically, base flow of ...
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