When you get those smells from water, it is due to anaerobic conditions (low or no oxygen). The fountain would add oxygen to the water, having it off can (depending upon the chemicals and water conditions) cause the lake to go anaerobic. Another thing they can do is to introduce a bubbler (like in most home aquariums). This till cause currents in the lake, thus keeping the water at the bottom of the lake oxygenated.
... or it could be a decomposing golfer .... EEK!
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