Story: Floods

Rocks for river control

Rocks for river control

It is not easy to obtain the rocks known as rip-rap, which are big enough to hold back rivers. Stopbanks also need to be carefully designed so that the rocks are not eroded. Wellington lacks suitable rocks, so they have to be imported from outside the region. The rocks laid out here near the Pōmare railway station in the Hutt Valley are from near Collingwood (Nelson) and Pongaroa (Wairarapa). Jeff Evans looks on while his father Bill spraypaints numbers on the rocks, which were used to build groynes in the Hutt River.

Using this item

Alexander Turnbull Library, Dominion Post Collection (PAColl-7327)
Reference: EP/1990/1264/7A

Permission of the Alexander Turnbull Library, National Library of New Zealand, Te Puna Mātauranga o Aotearoa, must be obtained before any re-use of this image.

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How to cite this page:

Eileen McSaveney, 'Floods - River monitoring and flood warnings', Te Ara - the Encyclopedia of New Zealand, (accessed 10 December 2023)

Story by Eileen McSaveney, published 12 Jun 2006, reviewed & revised 1 Aug 2017