The annual drawdown of Lake Rotoiti will start Monday August 7.
Bay of Plenty Regional Council lowered the lake by an extra 100mm each year as part of consent guidelines to help facilitate flushing and reduce flood risk in the Ohau Channel.
The council planned to hold levels at or near the drawdown limit for a few weeks, depending on weather, to facilitate surveys and monitoring and provide time for lake community feedback.
Council Principal Engineering Surveyor Graeme O'Rourke said the council had 10-15 percent of each year, or 36-55 days, to achieve this drawdown.
He encouraged anyone with any issues or observations around Lake Rotoiti to note the details and take photos for the record before contacting the council on 0800 884 880.