New Zealand

Erosion prevention at 10 sites on Katiki Beach

As erosion continues to threaten the coastal road between Shagpoint and Moeraki, NZ Transport Agency (NZTA) has given Downer a $ 3 million contract for rock armor work.

According to Jason Forbes, senior project manager at NZTA, rock armor was needed at 10 coastal erosion sites along National Highway 1 on Katiki Beach.

According to Forbes, rock armor (placement of rocks along the shore to prevent sand removal and protect highways from erosion) is a “more viable alternative” to readjust roads. It was “means”.

“Road readjustment is a very expensive option because the highway is close to the railroad,” he said.

Anti-erosion structures were installed on Katiki Beach in the 1970s where highways were threatened, and coastal road extensions have been monitored annually since 1994.

From 2008 to 2014, engineering services company Stantec investigated the coastal return and found that, on average, the cliffs receded about 1 m towards the road every 10 years.

In 2017, three “high-risk” sites were covered with rock armor to prevent highway damage from coastal erosion.

“This new contract is to complete 10 more sites that have been identified as high priority protection work,” he said.

“Most of Katiki Beach will eventually require rock armor, so coastal erosion will not damage Route 1. This is an important road cargo and lifeline between Dunedin and Christchurch. It’s a link. “

Waitaki Mayor Gary Curcher said it was a “strategic” road in the area.

“It’s a significant investment for NZTA … it’s very nice to see them putting that money into it.

“And from an aesthetic point of view, it’s one of the few roads for quite a few ways you can actually drive along the ocean.”

He said the council continues to monitor other “endangered” areas of coastal roads in the district, such as Beach Road.

“Erosion has always been a problem and will continue to be.”

Depending on the weather and consent requirements, rocks will begin to be stockpiled at Katiki Beach early next year. The rock armoring work should be completed within a year, according to Forbes.

Erosion prevention at 10 sites on Katiki Beach

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