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Maps, above show the 100 year event flood depth before and after it is built.
As part of building O Mahurangi Penlink, Waka Kotahi will construct three wetlands and an attenuation pond to reduce the runoff on Whangaparāoa Road generated by the new highway.
In an update on the project, Waka Kotahi says currently, water rises over the top of Whangaparāoa Road during extreme weather events, creating traffic disruptions and safety issues.
“Downstream flows are also high,” the report says.
This runoff could increase once the new road is built, and the wetlands and pond ...
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