Abstract
The Welsh Government enacted an amendment to the Reservoirs Act 1975 reducing the qualifying capacity of large raised reservoirs to 10 000 m3 from 25 000 m3. This led to an increase in the number of reservoirs falling within the Reservoirs Act in Wales. In 2019, Natural Resources Wales (NRW) appointed Arcadis to undertake the production of a suite of reservoir inundation maps for over 160 reservoirs across Wales using the Environment Agency's Reservoir Flood Mapping specification. Following production of these maps advice on the risk designation was provided. Throughout the project several Arcadis teams collaborated to produce project-specific documentation, develop tools for automation, run hydraulic models and produce the mapping, in line with the specification requirements. On request by NRW, modelling of the cascades was modified, allowing cascade reservoirs to breach due to a fluvial scenario. Following this modification, it became apparent that some cascade reservoirs were being incorrectly triggered. Therefore, further changes to how cascade reservoirs were modelled were made to ensure they were triggered correctly.
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