Work has begun on a wetlands project at Tikitapu (Blue Lake) to help keep the water flat on a popular water skiing course.
The Rotorua Water Ski Club has spent three years fundraising for the floating wetland and this week work finally got started.
The project will cost more than $300,000 and will take six weeks to complete.
The wetland is the result of 10 years of debate among club members and other skiers who wanted to make the water on the slalom course consistent and smooth.
"It was a daunting prospect for a small club looking to improve the quality of our slalom course and the water quality of the lake at the same time," said club president Ian Barker.