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CRC PUBLICATIONS |
A Review of the Methods for Estimating Areal Reduction Factors for Design Rainfalls
R. Srikanthan
Publication Type:
Technical Report
This is a publication of the initial CRC for Catchment Hydrology
CRC Program:
Flood Hydrology (Previous CRC)
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Publication Keywords:
Areal Reduction Factor
Precipitation (Atmospheric)
Modelling (Hydrological)
Rainfall/Runoff Relationship
Design Data
Methods
Floods and Flooding
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Abstract / Summary:
A topic of considerable current interest and economic importance is the spillway adequacy of large dams. Recent changes to the means of estimating extreme rainfall(probable maximum precipitation) have led to the review of spillway design floods for dams throughout Australia.
CRC Project D3 "Probability and Risk of Extreme Floods" has a number of sub-projects which, collectively, have the potential for marked reductions in the uncertainties associated with extreme flood estimates. The overall approach is with rainfall-based methods of flood estimation, to take advantage of the longer periods of rainfall data available, compared with flow records.
In the application of design rainfalls, a correction factor (areal reduction factor) is applied to convert rainfalls for a point to the equivalent catchment average. This report, by Dr R Srikanthan of the Bureau of Meteorology, provides a review of current procedures and possibilities. As such, it is the necessary first step in the planning of a research project aimed at improving this aspect of the design flood process.
Project D3, like the others in the CRC, is a cooperative one, involving researchers from the Bureau of Meteorology, Rural Water Corporation, Monash University and the University of Melbourne. It is pleasing to acknowledge this contribution to the project from each of these groups.
Russell Mein
Program Leader, Flood Hydrology
Cooperative Research Centre for Catchment Hydrology
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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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