Relationship between Hazen–William and Colebrook–White Roughness Values
Publication: Journal of Hydraulic Engineering
Volume 133, Issue 11
Abstract
Despite advances in computing technology and derivation of explicit approximation formulas, the experimentally verified and widely applicable Colebrook–White friction factor formula is often rejected in favor of the limited and less accurate Hazen–Williams equation. The general reluctance of practicing engineers to embrace the Colebrook–White formula may be due to the relatively large available database for Hazen–Williams coefficient values versus a relatively small database of the equivalent sand roughness values required by the Colebrook–White equation. Until now, converting to required knowledge of both the Reynolds number and pipe diameter originally used to determine . The current effort derives implicit equations relating to that do not require additional information and compare well with published data. The exact solution is approximated with a single explicit equation, accurate to within 4% error.
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© 2007 ASCE.
History
Received: Apr 10, 2006
Accepted: Jan 30, 2007
Published online: Nov 1, 2007
Published in print: Nov 2007
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