October 2021

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Engineering Case Histories: Case 114: A local flooding event at a plant site

During a heavy rainstorm, flooding occurred at a plant location that had never before flooded.

Sofronas, A., Consulting Engineer

During a heavy rainstorm, flooding occurred at a plant location that had never before flooded. Concern arose that the underground storm sewer lines had become plugged with debris; however, it was undesirable to flush out the underground lines if it was not strictly necessary. Had the 6 in. of rain that had fallen in an hour (inches per hour, or iph) caused the flooding? The rain accumulation may have been too much for the storm sewer drains to handle. Typically, a heavy rain is 2 iph for the same time period. The question was: Were the drains plugged, or was the flooding due to the sudden high rainfall rate? An analysis can help answer this question. FIG. 1 shows a depressed basin-type area

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