Are overflows more frequent in the summer or winter?
In analyzing historical rainfall records, precipitation is found to be most frequent between April and September. In the summer, all precipitation is rainfall. In the winter, we can expect a mix of rain and snow. In some instances, a rain event occurs when there is snow pack present from previous snowstorms. When this occurs, the sewer system can simultaneously experience runoff from both the precipitation and from snowmelt. In addition, warm days when snow melts actually generate enough runoff to trigger an overflow event.
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