The city live in (Maplewood MN) recently built rain gardens in our neighborhood for catching rainwater.
They are basically deep pits filled in with gravel with slightly sunken garden on top. The water runoff from the street is diverted into them where most of it is absorbed into the ground.
They are basically deep pits filled in with gravel with slightly sunken garden on top. The water runoff from the street is diverted into them where most of it is absorbed into the ground.
http://www.bwsr.state.mn.us/images/ww-box.jpg
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