48
Fig. 5.5 Large-scale temporary
works required for construction
of locks and sluices on the Cardiff Bay Barrage, Wales. Note
ship passing the works (top)
highlighting the fact that tidal
water level is several metres
above founding level for the
works. (Courtesy of HR
Wallingford)
• Leisure facilities e.g. canoe slalom
T.N. Burt . I.e. Cruickshank· M.A. Littlewood
.•
• Temporary works for the above elements (see Fig. 5.5)
• Operating system that takes into account the economic and environmental policy of
the barrage (e.g. whether water in times oflow flows should be directed to flow down
the fish pass or the canoe slalom)
Achieving all these objectives is quite a challenge in itself. Such challenges include
enabling vessels free travel through the barrage whilst preventing the flow of saltwater
that the vessels are floating in!
5.4.10
Water-Related Risk
Risk assessment has, in recent years, become more widespread as an appraisal methodology. In risk assessment, all the factors producing an event or undesirable outcome are