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123769

HYDRAULICS OF CLEAR OVERFALL WEIRS WITH BOTTOM-OPENINGS

Article

Last updated: 04 Jan 2025

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Subjects

-

Tags

Civil Engineering: structural, Geotechnical, reinforced concrete and s…nd sanitary engineering, Hydraulic, Railway, construction Management.

Abstract

Many Fayoum Standard Weirs have been perforated by one, two or three pipes, to convey much water in downstream direction. Measurements of discharge with these structures are complicated due existence of the opening. In this research, an experimental study was carried out to investigate the flow over clear over fall weir with bottom opening. Nine weir models with different heights were tested in horizontal laboratory flume of 17 m length, 0.3 m width, and 0.5 m depth. Weir height is changed three times. For each one, the diameter of opening is changed three times. The downstream depth was changed to cover all the expected flow regimes of the pipe and the weir. These flow regimes are; free pipe-free weir, submerged pipe-free weir and submerged pipe-submerged weir. The results of flow over weir with opening were compared with those of weir without opening having the same dimensions. It was found that there is a large deviation between them. Multiple regression equations based on energy principal and dimensional analysis theory were developed for computing discharge over clear over fall weir with bottom opening. Also, values of discharge coefficients were estimated for combined flow over the weir and through the pipe. Then the total discharge can be computed by multiplying the discharge coefficient by the summation of theoretical weir discharge plus theoretical orifice discharge. Equations for computing the discharge of combination are awarded.

DOI

10.21608/jesaun.2010.123769

Keywords

Fayoumi weir, bottom opening, Discharge Coefficient

Authors

First Name

Gamal

Last Name

Abozeid

MiddleName

-

Affiliation

Prof., Civil Eng. Dept., Assiut Univ., 71516 Assiut, Egypt.

Email

-

City

-

Orcid

-

First Name

Hassan

Last Name

Ibrahim

MiddleName

-

Affiliation

Prof., Civil Eng. Dept., Assiut Univ., Assiut, Egypt.

Email

hassanmohamed_2000@yahoo.com

City

-

Orcid

-

First Name

Salah M.

Last Name

Shehata

MiddleName

-

Affiliation

Eng., Ministry of Water Resources and Irrigation, Egypt.

Email

-

City

-

Orcid

-

Volume

38

Article Issue

No 1

Related Issue

16624

Issue Date

2010-01-01

Receive Date

2009-10-01

Publish Date

2010-01-01

Page Start

19

Page End

28

Print ISSN

1687-0530

Online ISSN

2356-8550

Article File

JESAUN_Volume 38_Issue No 1_Pages 19-28.pdf

PDF . 198.0kB

Link

https://jesaun.journals.ekb.eg/article_123769.html

Detail API

https://jesaun.journals.ekb.eg/service?article_code=123769

Order

2

Type

Research Paper

Type Code

1,438

Publication Type

Journal

Publication Title

JES. Journal of Engineering Sciences

Publication Link

https://jesaun.journals.ekb.eg/

MainTitle

HYDRAULICS OF CLEAR OVERFALL WEIRS WITH BOTTOM-OPENINGS

Details

Type

Article

Created At

23 Jan 2023