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A regional frequency study of extremal rainfall and runoff processes

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Abstract

The annual maximum daily rainfall and annual maximum flood discharges in Lesotho were subjected to regional analysis. The mean of both time series was found to be a satisfactory parameter for regional study. The nondimensional series generated by using the mean as the divisor rendered the sequences homogeneous in the statistical sense throughout the whole country. The processes in question obey a lognormal probability law and are random in their sequential evolution. The annual maximum daily rainfall does not produce the annual maximum peak discharge in the rivers of Lesotho.

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Sharma, T.C., Makhoalibe, S. A regional frequency study of extremal rainfall and runoff processes. Water Resour Manage 1, 223–235 (1987). https://doi.org/10.1007/BF00429944

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Key words

  • Annual maximum daily rainfall
  • annual maximum flood
  • lognormal probability
  • moment ratio diagram
  • autocorrelation
  • analysis of variance
  • regionalisation