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Homme poussant une vache dans un bus, Paris, 1950

(Publicité pour le lait pasteurisé contre le lait frais livré ! )

Photo © Henri Roger-Viollet

From the Virginia Cooperative Extension Master Gardener Program:

Did you know that pollutants carried by rainwater runoff account for 70% of all water pollution (according to US EPA estimates)?
Rain gardens can slow down runoff long enough to filter it before it moves on. The plants, soil, and the microorganisms in a rain garden's soil act as a filter to clean or break down pollutants.
A rain garden is a natural or man-made planted shallow depression that temporarily holds runoff from impervious areas until it evaporates, is absorbed by the plants, or infiltrates into the ground. Think “puddle with plants.”
The runoff can then flow out of the rain garden into another a grass swale, a buffer, or into a nearby storm drain, stream, stormwater pond, or other body of water. It can infiltrate into the soil, evaporate back into the atmosphere, or the plants can absorb and use it. Water is meant to be held temporarily (two to four days), so it is filtered and gone before the next rainfall and so mosquitos don’t breed. Sediment is filtered when it is trapped by the plants and settles to the bottom of the garden.
To learn more about rain gardens:https://www.pubs.ext.vt.edu/content/dam/pubs_ext_vt_edu/spes/spes-13/SPES-13.pdf
Pictured: Rain garden in the High Point neighborhood in Seattle, WA, retain stormwater runoff, which can help reduce peak flooding.
Photo credit: US EPA Clarion Associates