Rain Garden Design Calculations
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Use the info buttons to the right of the input boxes for help and suggested inputs.
Rain garden design calculations. The result is the area in square feet or square meters that you need for your rain garden. X 1 52. Refer to these sections as needed throughout the remainder of this calculation sheet.
See the example below. This calculation sizes the garden to hold one inch of runoff from the drainage area in a garden 6 inches deep. You can decide what level of detail that is most suitable for your project and you can choose to use default values if you do not have all the information.
Surface area 52. Total impervious surface area draining to rain garden 520 ft2. For this sample calculation the roof area that will drain through the downspout to the rain garden is a total of 520 ft.
Site planning recommendation define goals and primary function of rain garden based on the rain garden step by step design procedures beginning on page 18 5 28 as well as table 18 5 2a. Enter information for the four items across the top surface area downspouts soil type and slope then slide the rain gauge up and down to see how rainfall capacity influences the size and cost of your garden. To use this tool enter the values in the fields below.
Divide this area by 6.
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