To enable an opinion to be formed various engineering calculations were undertaken. These included estimating the peak flow from the culvert during the
flood based on water levels observed by witnesses. The return period of the flood was then estimated by relating the calculated peak flow to a flood
frequency curve derived by Flood Estimation Handbook methods. This showed that the flood was far more severe than would be suggested by the Met Office
rainfall data alone. This information, together with estimated peak flows in the watercourse in the weeks prior to the flooding (due to both rainfall and
also a burst water main) allowed the flood itself to be put into its proper context.
Our expert witness provided opinion on the obligations of the various parties, the speed of occurrence of the flooding and the reasonable steps which one of the parties
could have taken prior to the flooding. The significance of several warning signs which occurred before the flood itself was also considered.
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