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Wrangle Runoff With Rain Gardens

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Rocky Rain Garden
Photo Credit: ©John Gishnock III, courtesy of the Wisconsin Department of Natural Resources
Rain gardens help filter runoff, protecting local water resources.
As a newcomer to coastal Florida in the early 1980s, I watched with amazement as the streets of the low-lying barrier island where I lived filled with swift-running water every time it rained. I also remember “old-timers” telling me ruefully, “It wasn’t like this in the ’50s. Now there’s too much concrete. The water’s got no place to go.”

While the village fixed the sewers and drains to accommodate the runoff, it also added even more concrete with all the new developments that sprung up. Local property owners elevated their lots and houses to keep them from being flooded during hurricanes. Today, storm water runoff – polluted with pesticides, fertilizer, gasoline, oil and other chemicals – continues to flow into the storm drains and out into the ocean, harming marine life. And it’s not just happening in Florida – this scenario is repeated all over the country in urban areas where there’s simply not enough green space.

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Mature Small Garden
Photo Credit: Courtesy of the Wisconsin Department of Natural Resources
 This mature rain garden may be small, but it works perfectly.
It’s easy to feel overwhelmed with the enormity of fixing our environmental problems, but if everyone did even a little something, it would go a long way toward making the world a healthier place to live. One tiny thing that each of us who has access to a small plot of land can do is plant a rain garden.

I’d never heard of rain gardens when I lived in Florida – one of the rainiest states in the country. But apparently this gardening phenomenon had already started on the East Coast back in the 1980s, and the idea’s now spread nationwide.

The concept of a rain garden is simple enough: The idea is to take a section of your yard and create a shallow, depressed area where you channel the runoff from your house. Adding native plants helps slow down the water so it can be absorbed. Not only does a rain garden diminish the amount of pollutants entering fresh water sources, it helps recharge groundwater. A garden this simple means you can feel good about helping the planet, as well as get all the benefits of a beautiful space that attracts birds, butterflies and dragonflies.

Tips
  • Even though it’s called a “rain garden,” you still need to keep your plants watered until they’re well-established. (Obviously if you live in a dry region, you’ll have to water more often than gardeners in a wet region.)
  • When you’re creating a berm to help hold the runoff, make sure your soil is well-compacted so it doesn’t wash away. Planting grass on the berm will help it keep its shape, too.
Facts
  • Rain gardens smaller than 100 square feet won’t be as effective as one that’s 100-300 square feet (and you can’t get as many plants in it). Smaller rain gardens may also hold water too long and damage plant roots. In general, the more runoff from your house, the bigger the rain garden should be.
Faqs
  • Q: Will a rain garden promote mosquito breeding?
    A: Mosquitoes are far more likely to breed in junkyards, where there’s standing water. The water in your rain garden should soak into the ground within a few hours. The garden will also attract dragonflies, which feast on mosquitoes.
Resources
  • Some books give very specific and detailed instructions and formulas for determining the optimum size of your rain garden based on lawn slope and roof size. Consider Rain Gardens: Bringing Water to Life in the Designed Landscape by Nigel Dunnett and Andy Clayden (Timber Press).
 
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