Flood Frequency Analysis Using the Gumbel Distribution
Journal Title: International Journal on Computer Science and Engineering - Year 2011, Vol 3, Issue 7
Abstract
This paper presents results of a study carried in Zimbabwe aimed at analysing the frequency of Nyanyadzi River floods using the Gumbel distribution. Extreme floods over recent years had washed away fields, destroyed infrastructure and killed animals. It was hypothesised that Nyanyadzi flood flows obey the Gumbel distribution. The scale and shape parameters of the distribution were estimated using method of moments. Maximum instantaneous flow data covering 30 water years (1969-1999) for station E119 on Nyanyadzi River were collected from the Zimbabwe National Water Authority (ZINWA). A Chisquare χ2 test revealed no significant (p =1.000) differences between recorded and predicted flood flows. Due to goodness of fit of the Gumbel distribution, it was assumed to be appropriate for modelling frequency of Nyanyadzi River floods. The magnitudes of the 100 and 200-year floods were estimated to be 276 and 310 m3/s respectively.
Authors and Affiliations
Never Mujere
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- EP ID EP92110
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