Midwest heavy rain and snowmelt: why drains back up
Across parts of the U.S. Midwest, periods of intense rainfall combined with melting snow can strain local storm-drain systems—sometimes leading to roadway flooding, slow drainage, and sewage backups. While storm drains are designed to carry stormwater away, the volume and timing of runoff can exceed what pipes, inlets, and pump stations can manage.
Here’s how the mix of heavy rain and snowmelt affects storm drains and why backups happen.
Runoff surges faster than drains can move water
During heavy rain, large amounts of water enter storm drains from streets, rooftops, and compacted ground. When snowmelt is occurring at the same time, meltwater adds another surge. The problem is not only total rainfall or total melt, but also how quickly water reaches the drainage system—often within hours, not days.
Frozen ground and ice can delay absorption
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