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CRC PUBLICATIONS |
The Calculation of Streamflow from Measurements of Stage
John Fenton and Robert Keller
Publication Type:
Technical Report
This is a publication of the current CRC for Catchment Hydrology
CRC Program:
River Restoration
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Publication Keywords:
Stream Flow
Flow Measurement
Modelling (Hydrological)
Discharge
Duration Curve
Discharge Curve
Standards
Hydraulics
Gauging Stations
Gauge Height
Slopes
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Abstract / Summary:
A major dilemma in flood estimation is that the data on the largest observed floods, which should carry the greatest amount of information relevant to the estimation of extreme fl oods, are also the ones with the lowest level of accuracy and reliability. The inadequacy of rating curves, used to convert measured water levels to estimated fl ow rates, is a major source of the error.
Rating curve errors impose severe limitations on further improvements in fl ood estimation methods. They introduce bias into both at-site and regional fl ood frequency estimates and make it diffi cult to identify the true degree of non-linearity in catchment response to storm rainfall. Accordingly, improvements in the determination of the high fl ow end of rating curves is regarded as vital to further improvements in the reliability of fl ood estimates and was a major objective of Project FL3.
In this report, a number of issues with regard to rating curve determination are addressed. By building on basic hydraulic principles, this report demonstrates that existing practices are inadequate and the authors document a number of techniques to improve current practice.
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Centre Office:
CRC for Catchment Hydrology
Dept of Civil Engineering
Building 60
Monash University Vic 3800
Tel: +61 3 9905 2704
Fax: +61 3 9905 5033
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