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Calibration of weirs in The Fayoum, Egypt

Wolters, W. / Ghobrial, Nadi Selim / Eisa, Mohamed

Abstract Weirs in the irrigation system of The Fayoum Governorate in Egypt have been modified: crests have been widened and pipes have been installed. As a result, the head-discharge ratings became invalid or unknown, and the irrigation system became difficult to manage. To obtain valid rating curves for the modified weirs, a flow-measurement programme with current-meters was started. The reasons why this programme did not yield ratings of sufficient accuracy are given. Hydraulic theory on flow over weirs and through pipes was subsequently used to arrive at acceptable ratings. An example is given for a widened weir with a pipe through its still. The theoretical rating is compared with the current-meter measurements. It is shown that the theory gives better ratings in a shorter time.

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Calibration of weirs in The Fayoum, Egypt

Wolters, W. / Ghobrial, Nadi Selim / Eisa, Mohamed

Abstract Weirs in the irrigation system of The Fayoum Governorate in Egypt have been modified: crests have been widened and pipes have been installed. As a result, the head-discharge ratings became invalid or unknown, and the irrigation system became difficult to manage. To obtain valid rating curves for the modified weirs, a flow-measurement programme with current-meters was started. The reasons why this programme did not yield ratings of sufficient accuracy are given. Hydraulic theory on flow over weirs and through pipes was subsequently used to arrive at acceptable ratings. An example is given for a widened weir with a pipe through its still. The theoretical rating is compared with the current-meter measurements. It is shown that the theory gives better ratings in a shorter time.

Calibration of weirs in The Fayoum, Egypt

Wolters, W. / Ghobrial, Nadi Selim / Eisa, Mohamed

Abstract Weirs in the irrigation system of The Fayoum Governorate in Egypt have been modified: crests have been widened and pipes have been installed. As a result, the head-discharge ratings became invalid or unknown, and the irrigation system became difficult to manage. To obtain valid rating curves for the modified weirs, a flow-measurement programme with current-meters was started. The reasons why this programme did not yield ratings of sufficient accuracy are given. Hydraulic theory on flow over weirs and through pipes was subsequently used to arrive at acceptable ratings. An example is given for a widened weir with a pipe through its still. The theoretical rating is compared with the current-meter measurements. It is shown that the theory gives better ratings in a shorter time.

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Title:

Calibration of weirs in The Fayoum, Egypt

Contributors:

Wolters, W. (author) / Ghobrial, Nadi Selim (author) / Eisa, Mohamed (author)

Published in:

Irrigation and Drainage Systems ; 1

Publication date:

1987

ISSN:

DOI:

https://doi.org/10.1007/BF01139328

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Classification:

BKL: 48.00 Land- und Forstwirtschaft: Allgemeines / 56.00 / 48.00 / 56.00 Bauwesen: Allgemeines

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