Midwest heavy rain and snowmelt: why drains back

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.