Rain Gardens as a Tool to Reduce Runoff

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A rain garden is a shallow depression that collects a few inches of rain water and allows it to be absorbed into the ground or by plants, instead of running off directly into nearby streams and lakes.

Plants and soil trap, absorb and filter pollutants found in stormwater runoff, including fertilizers, pesticides, oil, metals and pet waste.

Rain gardens help us:

  • improve water quality
  • increase the amount of water that filters into the ground, therefore recharging the aquifer
  • prevent flooding, erosion and drainage problems
  • protect stream and lakes from pollutants carried by urban stormwater
  • enhance the beauty of our community
  • provide valuable habitat for birds, frogs, butterflies and beneficial insects
Recently, I joined the Central Davidson horticulture and animal science students for an activity called Rain Garden in a Bottle. Students learn about rain gardens, how their made and why they're useful. Then, they get to make their own rain garden in a bottle using their choice of materials, including plants, soil, sand, clay, rocks, straw, moss and more. Lastly, students competed to see whose rain garden retained the most water and whose rain garden filtered water the best. 
Students assemble their materials in their bottles.

Students wait to see whose rain garden was the best as retaining and filtering water.




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