Title: Analytical solution for the flow velocity and water surface angle in drainage and sewer networks: case of pipes arranged in series

Authors: Lotfi Zeghadnia; Lakhdar Djemili; Larbi Houichi

Addresses: Department of Civil Engineering, Faculty of Sciences and Technology, University of Mohamed Cherif Messaadia, Souk Ahras, Algeria; Department of Hydraulics, Faculty of Engineering Science, University of Badji-Mokhtar, Annaba, Algeria ' Department of Hydraulics, Faculty of Engineering Science, University of Badji-Mokhtar, Annaba, Algeria ' Department of Hydraulics, Faculty of Engineering Science, University of Elhadj Lakhdar, Batna, Algeria

Abstract: Drainage and sewer network runs mostly under free surface flow condition. Among the characteristics which are important for practitioners are the flow velocity and water surface angle. The computation of these parameters in partially full pipes using Manning equation is implicit and requires iterative and laborious calculation methods. The goal of this paper is to provide a new method, where the exact computation of the flow velocity and water surface angle in partially filled pipe becomes easy, direct and simple using a reference pipe with known characteristics.

Keywords: water surface angle; free surface flow; uniform flow; steady flow; circular pipes; Manning equation; flow velocity; drainage networks; sewer networks; in series pipes.

DOI: 10.1504/IJHST.2014.064413

International Journal of Hydrology Science and Technology, 2014 Vol.4 No.1, pp.58 - 67

Published online: 30 Aug 2014 *

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