An Insight Into Flood Frequency For
Design Floods
Author(s)
M. Mohssen
Abstract
The maximum annual flood (MAF) series of peak flows have been commonly
used in the literature to estimate the parameters of a statistical model in order to
estimate design floods for the proper protection and management of flows during
extreme events. The use of maximum annual flows restricts the size of the
available sample to the number of available years of observed flows, and ignores
the fact that flood events which are not the highest in some years, can be higher
than the highest flows of other years. The partial duration flood (PDF) series,
which includes flood events above a specified threshold, has been addressed in
the literature as a more efficient alternative. A new relation between the return
periods of the PDF and the MAF series have been derived based on the
assumption that flood events are independent, without the need to assume that
their arrival follows a Poisson process. The General Extreme Value (GEV)
distributions, including the Gumbel as a special case, in addition to the
Generalized Pareto (GP) distribution have been fitted and applied to the flood
events of the Tokomairiro River, New Zealand. The use of the PDF series, with
115 flood events in 21 years, resulted in smoother and more homogeneous series,
and produced higher design floods than the MAF series. The new derived
equation for the relation between PDF and annual return periods resulted in
smaller design floods for return periods up to 10 years, while design floods for
higher return periods were almost the same as the values obtained from the
available relation in the literature.
Keywords: flood frequency, partial duration series, design floods, generalized
extreme value, Generalized Pareto, extreme flows.
Keywords
flood frequency, partial duration series, design floods, generalized
extreme value, Generalized Pareto, extreme flows.
Related Book
Other papers in this volume
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