The simplest way to size a stormwater planter is to measure the surface area from which the water will be collected. Here is a calculation to help you determine the right size planter for your roof, assuming water collection is from one roof downspout:
- Surface area of roof draining to a single downspout x 4 percent = square foot of planter for that downspout
If the roof area draining to a single downspout is 500 square feet, the footprint of the stormwater planter should be 20 square feet (0.04 x 500). That means you can design a planter that measures 5 feet by 4 feet or 2 feet by 10 feet or some other dimension that adds up to at least a 20-square-foot area.
These planters are very effective stormwater management tools in a confined space, because they take up so little square footage compared to how much runoff they can handle.
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