Portable Flumes with Adjustable Throatsby John Replogle, (F.ASCE),
Brian Wahlin, (A.M.ASCE),
Abstract: Vertically adjustable flumes for canal flow measurements address several problems in field practice. One involves the perception by some canal water users that flumes and weirs always significantly and harmfully re strict flow because of their upstream ponding. This causes opposition to flow measurements and thwarts proper irrigation water management. Parshall and Cutthroat flumes require upstream ponding depths of about 40% of the head reading while long-throated flumes and the re lated broad-crested weirs require about 10% to 15%. The vertically adjustable, long-throated flumes allow the reduction of ponding at nearly all flow rates for a par ticular flume size. This reduces the amount of visible restriction. In small sizes, less than 1 m wide and flowing less than about 25 to 30 cm deep, the increased restriction is about 3 to 5 cm. They are applicable to measuring flow rates in lined and unlined canals. Canal operators, researchers, and farm irrigators dealing in water management and the measurement of water in canal systems, both large and small, should be candidates for using devices incorporating these features.
Subject Headings: Flumes | Flow measurement | Canals | Weirs | Water flow | Rivers and streams | Irrigation water
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