The Philadelphia Water Department has some excellent information about making Rain Gardens. You can make that boggy place in your front yard a thing of beauty and help clean and conserve water. Once planted, such a garden is maintained with little to no effort.
To select a location for the rain garden, begin by observing your yard during a rainfall event. Notice where water is flowing from, and where it is going. Rain gardens should ideally be located between the source of runoff (roofs and driveways) and the runoff destination (drains, streams, low spots, etc.).
The photograph on the right is a rain garden in Philadelphia, designed by Edgar David. Rainwater that flows from the house roof to the stone cistern is used to irrigate an intimate collection of woodland plants. You can read more about this interesting garden HERE.
Now for some Velvet Fog.