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Water Measurement Manual
This searchable manual, although very technical in parts, is useful for learning how water flow is measured (e.g., by water districts, conservationists, and irrigation system operators). Published by the Bureau of Reclamation, U.S. Department of the Interior, in cooperation with the U.S. Department of Agriculture (USDA).
http://www.usbr.gov/pmts/hydraulics_lab/pubs/wmm/
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