What is Stormwater? - Iowa Stormwater Education Partnership

What is Stormwater?

Stormwater is rain or snowmelt that flows over impervious surfaces like driveways, sidewalks, and streets preventing it from naturally soaking into the ground. It picks up litter, toxic chemicals, dirt, and other pollutants as it runs off into a storm drain that discharges to an underground storm sewer system. Anything entering a storm drain is piped directly to the closest body of water, typically a creek, stream pond, lake or river, with no treatment in-between.


Streets to Streams :  No Treatment In-Between


Tidbit snippet:  There are 27,150 gallons of water in one inch of rain falling over an acre of ground - that is .62 gallons of rain for every square foot of rootop, lawn, sidwalk and driveway.  

Q:  How much of the rain falling on your property should you control?  

A:  Work to manage 100%!

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