Investigation Of Water Flow Over Contracted Rectangular Flat-Crested Slit Weir In Open Channel
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Date
2009-12
Authors
Jaafar, Rosley
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Journal ISSN
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Publisher
Universiti Sains Malaysia
Abstract
Weirs are among the oldest and simplest hydraulic structures that have been used for many years by hydraulic engineers for flow measurement, energy dissipation, flow diversion, regulation of flow depth, flood passage and other means in open channels. A number of discharge equations are available for rectangular sharp-crested weirs at various weir heights, weir heads and discharge flows of water but such equations are not available for contracted rectangular flat-crested slit weirs. In this study, the slit weir concept is extended for contracted rectangular flat surface of weir crest to measure the discharges of small flow rates at different weir heights. This study was carried out on nine different weir heights with 10 mm weir width and 4 mm weir crest thickness. The discharge coefficient in the general weir equation has been determined experimentally to be 0.69. The relationship between the discharge coefficient and the main dimensionless parameters is obtained. The recommended discharge equation obtained from this thesis can be used to accurately estimate water flow over contracted rectangular flat-crested slit weirs.
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Keywords
Water Flow Over Contracted Rectangular Flat-Crested Slit Weir , Open Channel