© Earth Partnership for Schools•University of Wisconsin–Madison Arboretum Plan a Rain Garden 3-1
Background
Determining the size of a rain garden is not an exact science.
Experts have
different opinions.
With that said, how big will you build your rain...
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© Earth Partnership for Schools•University of Wisconsin–Madison Arboretum Plan a Rain Garden 3-1
Background
Determining the size of a rain garden is not an exact science.
Experts have
different opinions.
With that said, how big will you build your rain garden?
There are two answers: any size you want, or if you want 100% runoff control, you need to make calculations.
The first answer may seem like an odd
response.
But it means that a rain garden of any size will reduce the amount
of precipitation that becomes surface runoff.
Each water drop that stays on
the school property is one less drop that potentially carries pollutants to
lakes, rivers and streams.
The second answer involves learning how large the
drainage area is, what type of soil is in the garden, and what is the percent
slope of the site.
Next take this information and plug it into formulas to obtain a square foot area for the garden.
The following activity description covers each step of the process for sizing a rai
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