RESEARCH ARTICLE


The Rough Model Method (RMM) Application to The Computation of Normal Depth in Circular Conduit



Bachir Achour*, Sabah Sehtal
Research Laboratory in Subterranean and Surface Hydraulics (LARHYSS) University of Biskra, PO Box 145 RP 07000 Biskra, Algeria.


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Creative Commons License
© 2014 Achour and Sehtal;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Research Laboratory in Subterranean and Surface Hydraulics (LARHYSS) University of Biskra, PO Box 145 RP 07000 Biskra, Algeria; Tel: 00213557263947; Fax:0021333742481; E-mail: bachir.achour@larhyss.net


Abstract

A new method is presented to compute the normal depth in circular conduit. This is the rough model method (RMM). It states that the linear dimension of a conduit or channel is equal to the linear dimension of a referential rough model corrected by the effect of a non-dimensional correction factor. The method is based on the Colebrook-White and Darcy-Weisbach relationships, applicable to the entire domain of turbulent flow. From the relationship governing the flow in the rough model, the normal depth in a circular conduit is explicitly deduced.

Keywords: Circular conduit, discharge, energy slope, normal depth, rough model method.