Tidal technology to stop flooding

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Courtesy of WaStop International AB

A large 1.6 metre valve that stops tidal waters getting into the stormwater network will help stop flooding in the city centre during heavy rainfalls.   High tidal levels and heavy rain cause problems in Porirua, New Zealand.  Porirua was the first Council in New Zealand to test the valves, which are a Scandinavian design called WaStop.

The Councils Water Services Engineer Desmond Scrimgeour says the valve stops tidal flow entering the drains through the use of a cone-shaped rubber menbrane.

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