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Corresponding Author

El-Gamal, Mohammed

Subject Area

Civil and Environmental Engineering

Article Type

Original Study

Abstract

Under various conditions of flows in open channels with time, sediments are accumulated gradually upstream weirs. Accumulated sediments upstream weirs cause the back water curve and discharge coefficient (Cd) of weirs to change. For this reason, the effect of four different models of accumulated sediments on the discharge coefficient and the maximum height of backwater curve (Z) of Fayoum type weir (narrow crested weir) had been experimentally investigated. In this research, four values of discharges equal to 8 lit. /sec., 10 lit. /sec., 13 lit. /sec. and 15 lit. /sec. were used. From the analysis of results, compared with the case of no sediments, it was observed that with the increasing of accumulated sediments, the head over weir crest (H) decreased by about 16 % and consequently, the discharge coefficient of weir increased by about 38 %. The maximum height of back drawdown water curve upstream weir (Z) decreased gradually with the increasing of accumulated sediments by about 5.3%. For the aforementioned analysis, it is recommended to eliminate all of accumulated sediments upstream Fayoum type weirs for improving the performance.

Keywords

sediments; Fayoum weirs; Open channels; experimental work

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