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Checking trends


As Engineer in Charge of the London Flood Room in the 1970s, I was pleased to read in Dave Parker's article on the Thames Barrier (NCE 9/30 December 1999) about the accuracy in estimating the number of closures by the end of the 20th century.

However, recent shoreline management plans for southern England have highlighted the inconsistency in estimating extreme flood levels and the need for an improved and integrated monitoring system, as well as a research programme toidentify trends due to the effect of global warming on high waters and the frequency, strength and movement of storms.

These trends could have a marked effect on the management of the coastline and rivers and on the accuracy of the estimate for the number of closures of the Thames Barrier.

Alan Allison (M), 'valanem' Environmental Management,

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