Because the downpour is the load test and the outage risk in one event. Rain comes off the Oquirrh foothills fast, the pit fills at its fastest rate of the year, and the same storm is the likeliest hour for the power to flicker or fail. A pump that was adequate on paper meets its design storm and its power cut together. The prevention answers are sized for that hour: a backup pump on battery or water power, and a high water alarm that calls before the pit tops.
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