If you look at the Bizer Lake Level charts you can see that the Winni water level is drawn down beginning in mid July through mid October. Why? To prepare Winni to be able to absorb the spring melt and typical spring rains and act as a buffer for downstream. Why start so early? Because it takes a long time to draw down Winni 15 inches without causing addition downstream flooding. Plus it gives more time to manage unusual amounts of rain.
So the dam management people are now thinking of a slow and steady drawdown, not keeping it at a high level.
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