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  Sources:

• ASAE Standards 1994, Standard Engineering Practices Data.  41^st ed. , American Society of Agricultural Engineers, 1994.
• Durrenberger, Robert W. Dictionary of the Environmental Sciences. Palo Alta, Ca.: National Press Books, 1973.
• Government of Canada. "Glossary of selected terms." The State of Canada's Environment. Ottawa, 1991.
• North Dakota State Water Commission. Water words: a glossary of water-related terms. Bismark, 1988.
• Parker, Sybil P. (Ed). McGraw-Hill Dictionary of Scientific and Technical Terms. 3rd ed. New York: McGraw-Hill, 1984.
• UNESCO; World Meteorological Organization. International Glossary of Hydrology. Geneva, Switzerland, 1974.
• US Environmental Protection Agency. Glossary of Environmental Terms and Acronym List. Washington, D.C., 1989.
• Whittow, John. The Penguin Dictionary of Physical Geography. Markham: Penguin Books, 1984.

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