Derivation and application of the energy dissipation factor in the design of fishways

Ecological Engineering
By: , and 



Reducing turbulence and associated air entrainment is generally considered advantageous in the engineering design of fish passage facilities. The well-known energy dissipation factor, or EDF, correlates with observations of the phenomena. However, inconsistencies in EDF forms exist and the bases for volumetric energy dissipation rate criteria are often misunderstood. A comprehensive survey of EDF criteria is presented. Clarity in the application of the EDF and resolutions to these inconsistencies are provided through formal derivations; it is demonstrated that kinetic energy represents only 1/3 of the total energy input for the special case of a broad-crested weir. Specific errors in published design manuals are identified and resolved. New, fundamentally sound, design equations for culvert outlet pools and standard Denil Fishway resting pools are developed. The findings underscore the utility of EDF equations, demonstrate the transferability of volumetric energy dissipation rates, and provide a foundation for future refinement of component-, species-, and life-stage-specific EDF criteria.

Publication type Article
Publication Subtype Journal Article
Title Derivation and application of the energy dissipation factor in the design of fishways
Series title Ecological Engineering
DOI 10.1016/j.ecoleng.2015.06.014
Volume 83
Year Published 2015
Language English
Publisher Elsevier
Contributing office(s) Leetown Science Center
Description 10 p.
First page 208
Last page 217
Online Only (Y/N) N
Additional Online Files (Y/N) N
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