ALTERNATIVE APPROACH TO THE FORMULATION OF BASIN HYDRAULIC GEOMETRY EQUATIONS

Sally A. McConkey, Krishan P. Singh

Research output: Contribution to journalArticlepeer-review

Abstract

ABSTRACT: Along a drainage network, there is a systematic variation of average flow parameters (width, depth, and velocity) at flows having the same flow duration. Hydraulic geometry equations mathematically express this interdependent relationship of stream‐flow characteristics for a basin for annual flow durations varying from 10 to 90 percent. However, the equations proposed so far have had rather poor predictive performance for low flows. An independent investigation of the variation of discharge with drainage area and annual flow duration demonstrates a consistent relationship between these parameters. The relationship for the high to median‐flow range differs, however, from that for the median— to low‐flow range. The proposed equations provide a better predictive performance for low flows than previous formulations and a versatile means of estimating flow parameters for streams throughout a basin. The improved basin hydraulic geometry equations have a wide range of applications in areas such as stream habitat assessment, water quality modeling, channel design, and stream restoration projects.

Original languageEnglish (US)
Pages (from-to)305-313
Number of pages9
JournalJAWRA Journal of the American Water Resources Association
Volume28
Issue number2
DOIs
StatePublished - Apr 1992
Externally publishedYes

Keywords

  • alluvial channels
  • flow duration
  • flow modeling
  • hydraulic geometry
  • hydrogeology
  • stream morphology

ASJC Scopus subject areas

  • Ecology
  • Water Science and Technology
  • Earth-Surface Processes

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