JOHN ALLAN

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KAUAROA CASCADESWAIHEKE ISLAND

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Stormwater, collected from roads and detention tank overflow, is directed through vegetated strips in the centre of retaining walls

Kahikatea specimens line the central channel

Water runoff from green roofs is held in detention tanks that are available to residents for use as non-potable water, while overflow re-enters the treatment train

Cleaned water provides amenity value for users of the central public space

Retaining wall strips vegetated with drifts of oioi

Water from vegetated strips is directed through a central channel into a vegetated wetland with a variable cell arrangement, then cascades down a series of waterfalls

Water is slowed and sediment accumulates around a series of islands in the constructed pond system, planted with a mixture of kukuraho (club rush), blue coastal sedge, and oioi.

Water exits the system to Kauaroa Bay via a channel adjacent the terraced public space