Ques­tions over coast re­pairs


The vi­a­bil­ity of con­tin­u­ing to re­me­di­ate coastal ero­sion prone sites is be­ing in­ves­ti­gated by Auck­land Coun­cil as it be­gins $30 mil­lion of work to fix some storm dam­age.

The coun­cil is deal­ing with 139 sites on its land across the re­gion, and there were many more slips on top of this, geotech­ni­cal and ge­o­log­i­cal prac­tice lead Ross Roberts told Hi­bis­cus and Bays Lo­cal Board mem­bers in an up­date on work be­ing car­ried out in the board’s area.

Most slips oc­curred last March, and re­cent bad weather caused fur­ther dam­age, Roberts said.

Sites had been pri­ori­tised by clas­si­fy­ing risks to the coun­cil and mem­bers of the pub­lic, he said.

Ranked at the top were Te Araraoa Trail seg­ments Lo­tus Walk in Browns Bay and Crows Nest Walk in Mur­rays Bay.

As part of re­me­dial work de­signs, long term vi­a­bil­ity needed to be se­ri­ously con­sid­ered, Roberts said.

Sites like Crows Nest, where there was ev­i­dence of a pre­vi­ous walk five me­tres out on now nonex­is­tent cliff top, flagged is­sues of ac­tively re­treat­ing cliffs and coast­line, Roberts said.

‘‘Th­ese paths are go­ing to continue to get dam­aged, and over time we will get to a point where there is no pu­bic land left and we are into pri­vate land ... and then the op­tions be­come very lim­ited.’’

Coastal and Geotech­ni­cal Ser­vices Team Man­ager Paul Klinac said the same think­ing on cost and vi­a­bil­ity was be­ing ap­plied to coastal struc­tures like seawall and beach ac­cess ways.

‘‘It will get worse over time in many ar­eas, so now is the time to start to pre­pare.’’

Lo­cal board chair­woman Ju­lia Parfitt re­quested fur­ther in­for­ma­tion on when re­me­di­a­tion would oc­cur on an Arkles Bay walk­way closed by slips at the end of May. Al­though it hadn’t made the pri­or­ity list, peo­ple were ask­ing when it would open, she said.

An­other slip site at Is­land Drive in Gulf Har­bour would be re­shaped to remove pond­ing, and it was pro­posed noth­ing would be done to re­me­di­ate slips sites at 787 and 821A Whanga­para¯ oa Rd and 56 Ardern Ave in Whanga­para¯ oa, as there was no pub­lic ac­cess.

An Arkles Bay walk­way slip didn’t make the pri­or­ity list.

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