FLOOD warnings have been cited by Hydro Tasmania for its decision to drain Lake Trevallyn earlier this month.
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The actions meant the lake was rendered useless to recreational kayakers and fishers from October 6 to October 12, according to Launceston's Mark Rathmell.
Mr Rathmell said although he understood the potential for water levels to fluctuate, the lake should still have been left usable for user groups.
"Personally, I would use it four times a week . . . the dam is used every day by scores of people paddling," Mr Rathmell said.
"My question is: are there agreed lower levels that are supposed to be maintained, or are they just free to drain as much as they want?"
A Hydro Tasmania spokeswoman said the dam was now just under maximum capacity.
"On October 7 a decision was made to lower the lake level, following a flood warning issued by the Bureau of Meteorology," the spokeswoman said.
"Drawing lake levels down in anticipation of high flows after a rainfall event is standard operating practice. It minimises spill."
She said the organisation maintained a list of stakeholders with an interest in the water body, who were advised that water levels were to be lowered.
"Following subsequent communication from a member of the kayaking community, we now know that representatives of the kayaking community were not on that list," she said.
"We have rectified this."
The spokeswoman said there was no risk of security to the electricity supply for Tasmania, even in repeat drought conditions.
She said the organisation "would like to assure all Tasmanians that there is no suggestion of any need for rationing power" in relation to the occurrence.