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Three weirs are being trialled to improve the look of the concrete flood channel, described by some Otago regional councillors as "appalling", by preventing the channel completely emptying out.
ORC environmental engineering and hazards director Gavin Palmer said it was hoped the about $30,000 work would be "substantially" completed by the end of the week.
"The weirs will create shallow ponds at low tide".
They had been designed so as to not block fish passage out to sea, he said.