The frequency analysis of annual peak flood data is considered to be one of the widely used methods for estimating frequency floods. The extra-apolation of frequency floods is generally avoided due to indadequate data available for such studies. In the present paper, an attempt has been made to study the amount of errors involved in extrapolation over sufficiently long periods by using short period series. In order to achive this aim, flood data available for six gauging stations with varying catchment areas and spread over different regions of the country (India) have been selected for studies and analysed by the most commonly used Gumbel’s extreme value distribution using Least Square Method and by Method of Maximum Likelihood. It has been found that the extent of error in exrapolation does not increase appreciably with the extent of extrapolation but corresponds to the error in selection of sample series. In order to estimate the frequency floods within an error of ±10%, about 50 years flood record may be essential.
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- Extrapolation Error in Flood Frequency Analysis
- Springer Netherlands