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The Jubilee River story - The 1992 Public Inquiry - Report
Sub-standard hydraulic models?
The Public Inquiry into the MWEFAS planning application was held
in Reading - October/December 1992 and reported in 1993
Here is the expert view of the Assessor: P Ackers - M Sc(Eng) FCGI FICE MIWEM MASCE
- on the hydraulic models used to justify the scheme.
A scan of the original section of the report is produced
below. For a digital copy of the full Public Inquiry report, please
Extract from 1992 Maidenhead, Windsor and Eton Flood
Alleviation Scheme Public Inquiry -
Report to Minister.
15. Further aspects of hydraulic performance
15.1. It would be very embarrassing to all concerned
intended discharge capacity of the FRC (1) was not achieved. Thus the hydraulic
computations are particularly important, and in this context the sensitivity of
the channel to the roughness coefficients used and the method of dealing with
two-stage channels implicit in the modelling are dominant issues.
This is the largest fluvial flood alleviation scheme ever
to be carried out in the Thames region, and any deficiency in capacity would
bring wide-spread – and justified – criticism. It would be the largest man-made
river to be created in the UK with full regard to the latest policies regarding
The question of the flow capacity likely to be obtained is
not an issue that can be clouded over in the hope that design tolerances could
later explain away any deficiency. It is my firm view that
there is no room for
retaining optimistic assumptions in the hydraulic design: in view of the
novelty and scale of environmental enhancements proposed, some conservatism,
some consideration of tolerances on assumptions is necessary.
Assessor: P Ackers - M Sc(Eng) FCGI FICE MIWEM MASCE
(1) [Flood Relief Channel now
called the Jubilee River]
Jubilee River - MAP (EA) 163Kb.pdf
Scan of original document below: