For a lake to keep its water over time, it has to be replenished. There are both natural and man-made lakes. The main way that water gets into reservoirs and man-made lakes is from the rivers and streams that were dammed to create them.
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Turnover is a natural way the lake cleans up harmful bacteria and algae. It carries dead algae down into the depths of the lake where there is less sunlight, helping to prevent algae growth. You can think of it as an escalator, moving the algae cells from the top of the lake to the bottom.
But sometimes lakes dry up altogether, whether because they're man-made lakes that are drained on purpose or because people have mismanaged them so badly that they shrink into nothing.
Yes. Over the last decade, summer water levels have been higher than average, but dry seasons have been starting earlier than expected, with water levels falling lower than usual. So we're seeing larger fluctuations across the year.