What is the impact of a well designed Rain Garden on the environment and how much capacity is needed per 1,000 square feet of run-off?
How effective are Rain Gardens?
Check out this link, for answers to ALL your questions: http://www.dnr.state.wi.us/runoff/rg/rgm...
In a nutshell, you need 1000 sq' of capacity; however, it depends on how many downspouts you have and if they evenly divide up the roof square footage. If you run all your downspouts to one location, then the 'rain garden' would need to hold all this water. Size and shape would be up to you. So if you built a oval garden, like I did and you had all your downspouts flow into one location, you could have potentially a depression 10' x 15' x 4" deep (example). I built 3 - 8'x10' rain gardens that overflow into each other. The first contains bog type plants, the second (or first overflow garden) contains normal moisture requirement plantings, the third contains drought tolerant plants. E-mail me if you want some pictures: hawaii2day-4biscuit@yahoo.com
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