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As a reservoir owner or operator you are required to appoint a panel engineer for large raised reservoirs, including those classed as ‘high-risk’:
during the design and construction of any reservoir with an ‘escapable’ volume greater than 25,000 cubic metres (construction engineer)
where an abandoned reservoir is to be restored and will be brought back into use as a large raised reservoir again (construction engineer)
to supervise the reservoir once built (at all times) and produce a statement once a year (supervising engineer)
to carry out an inspection every 10 years, identify safety work and set you deadlines for the work to be completed (inspecting engineer)
to supervise and certify any recommended measures to be taken in the interests of safety (inspecting engineer)
Reservoirs that have been determined as ‘not high-risk’ only need to appoint a construction engineer during the design and construction, restoration or alteration of the reservoir. Supervising and inspecting engineers are not required.