Alternative low-cost overflows for siphonic roof drainage systems: Proof of concept

Terry Lucke; Simon Beecham

doi:10.1016/j.jobe.2015.03.006

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Alternative low-cost overflows for siphonic roof drainage systems: Proof of concept

Journal article

Open access

Peer reviewed

Alternative low-cost overflows for siphonic roof drainage systems: Proof of concept

Terry Lucke and Simon Beecham

Journal of Building Engineering, Vol.2, pp.9-16

2015

DOI: https://doi.org/10.1016/j.jobe.2015.03.006

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Abstract

siphonic roof drainage system

secondary overflow system

siphonic outlets

full pipe flow

This paper describes an experimental investigation of alternative overflow systems for roof structures that are drained siphonically. Many buildings that have siphonic roof drainage systems currently incorporate a separate secondary overflow system, which is quite often also siphonic. An alternative low-cost technique that is explored in this study is to connect each overflow outlet to a single, vertical downpipe. Seven different overflow configurations, each with five different downpipe lengths, are investigated in terms of maximum flowrate and corresponding water depth in the gutter. The results of this study are significant in that they do not support the common theoretical assumption that there is a limiting length of a siphonic downpipe over which pipe-full flow may occur before gravity causes the water to accelerate enough for it to no longer occupy the full cross-sectional area. Instead, this study has found that once a downpipe is flowing full, it is possible for pipe-full flow conditions to be maintained over the entire pipe length.

Details

Title: Alternative low-cost overflows for siphonic roof drainage systems: Proof of concept
Authors: Terry Lucke (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Simon Beecham (Author) - University of South Australia
Publication details: Journal of Building Engineering, Vol.2, pp.9-16
Publisher: Elsevier BV
Date published: 2015
DOI: 10.1016/j.jobe.2015.03.006
ISSN: 2352-7102; 2352-7102
Copyright note: Copyright © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ The final version is available from http://dx.doi.org/10.1016/j.jobe.2015.03.006
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449395802621
Output Type: Journal article
Research Statement: false

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Collaboration types: Domestic collaboration
Web Of Science research areas: Construction & Building Technology; Engineering, Civil