Friction Factor Choice in Hydraulic Simulation Models: Does It Matter?

by Angus Simpson,

Document Type: Proceeding Paper

Part of: WRPMD'99: Preparing for the 21st Century


(no paper) To model water distribution systems using computer hydraulic simulation, a user is required to select a form of head loss-flow relationship for each pipe in the network. The most common head loss formulas used to model water distribution systems include the Darcy Weisbach head loss equation and the Hazen Williams formula. Water supply authorities commonly use either of these two formulas. The Manning equation is also used for pipe flow calculations but is usually restricted to hydroelectric penstock head loss estimation. The Hazen Williams formula has been used widely in the water industry. It was particularly useful prior to the advent of computer simulation of pipe networks for hand computations because the Hazen Williams coefficient is assumed to be independent of flow conditions. This paper considers a detailed comparison of the Hazen

Subject Headings: Hydraulic models | Water supply systems | Simulation models | Friction | Computer models | Head (fluid mechanics) | Head loss (fluid mechanics) | Pipe networks

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