Water running off of residential roofs, roads and driveways can increase water in a stream by 500%, leading to increased flooding and erosion. A 300-square-foot rain garden infiltrates 12,000 gallons of water every year, or enough to fill 2 ½ tanker trucks.
Why build a rain garden?
Water that soaks in replenishes groundwater and helps prevent flooding.
A Rain Garden protects water quality by trapping sediment, fertilizers and other pollutants.
It needs no additional fertilizer and little pesticides.
Native plants provide food and shelter for butterflies, song birds and other animals.
A Typical Rain Garden:
Is a sunken garden 4-8 inches deep
Has a flat bottom
Is 1/3 the size of the area draining to it - usually 75-300 square feet in size
Can be formal or informal in design
Drains within two days
Visitor Information Center (VIC) Demonstration Rain Garden (2008)