Truman Parkway Rain Garden
Size:  (not chosen)
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An Earthcache is an Earth science lesson, we hope you will learn something while completing this.
A rain garden is a shallow depression that is planted with deep-rooted native plants and grasses. The garden should be positioned near a runoff source like a downspout, driveway, walkway, parking lot or storm drain. This reduces rain runoff by allowing storm water to soak into the ground. They can be designed for specific soils and climates. The purpose of a rain garden is to improve water quality in nearby bodies of water, in this case the Broad Creek and the South River.
A rain garden is not a water garden. Nor is it a pond or a wetland. Conversely, a rain garden it is dry most of the time. It typically holds water only during and following a rainfall event. They are designed to be drained within four hours after a 1” rain event. Under-drained rain gardens typically are designed to drain within 2 hours of the design storm event. This is achieved through the use of highly porous planting media and under-drains which carry the cleaned rainwater away from the garden. As a result, the plants selected for the bio-retention cell need to be able to withstand both the extremes of flooding and drought. Plants on the upper edges of the garden are often xeric in their cultural requirement descriptions with plants lower in the garden being more adapted to floodplain conditions. Many riparian edge species are particularly well suited to the extreme environments of rain gardens.
Rain gardens are shaped longer than they are wide and positioned perpendicular to the slope of the land in order to catch the maximum amount of rainfall. Rain gardens should be placed at least 10 feet away from building foundations and should not be located where water ponds for an extended period of time.
To get credit for this Earthcache, please answer the following questions in an email. There is a sign at the posted coordinates to find the answers:
1) Before the rain garden was constructed, what were the effects of the rain water on the Broad Creek?
2) What 5 organizations made this particular rain garden possible?
(No hints available.)