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The portion of the surface water resource that can be depended upon for annual water development during a period of time. The period of time varies according to national situation, but it is usually 19 out of 20 (or 9 out of 10) consecutive years.

Source Publication:
United Nations, European Commission, International Monetary Fund, Organisation for Economic Co-operation and Development, World Bank , 2005, Handbook of National Accounting: Integrated Environmental and Economic Accounting 2003, Studies in Methods, Series F, No.61, Rev.1, Glossary, United Nations, New York, para. 8.116.

Statistical Theme: Environmental statistics

Created on Monday, July 4, 2005

Last updated on Wednesday, November 30, 2005