A rain garden is a planting designed to catch and absorb water, rather than letting it run off.
Rain gardens are typically sited in a naturally low or wet spot – the place where water collects during a heavy rain. They are constructed by digging a shallow pit, then adding plants that enjoy a moist location. A relatively small one can be built in a day, and requires little maintenance after that. Instead of having a mud puddle or a stream running to the storm drain, the homeowner can enjoy a profusion of flowers, along with the birds and butterflies the plants will attract.
Stormwater is filtered as it is gradually absorbed into a rain garden, instead of going directly to the lakes with any pollutants it may pick up along the way. While a rain garden holds standing water, it does not attract mosquitoes, which need at least ten days of standing water to complete their life cycles. A rain garden usually empties much faster than this, and in one that doesn’t, the problem can be easily remedied with the addition of an overflow drain pipe.
Madison encourages homeowners to establish rain gardens. The city’s website includes instructions and sample designs.
If you are lucky enough to live in Verona, the city’s rain garden rebate program will give you up to $150 to help cover the cost of plants.