Roof To Rain Garden Size

For this exercise i ve used square feet as a measurement.
Roof to rain garden size. Sizing your rain garden. Water is absorbed fastest in sandy soils and slowest in clay like soils. If you are placing your rain garden more than 30 feet from a downspout take the yard space into account when you figure the drainage area. Most rain gardens are from 100 to 300 square feet.
This gives you the size to build the rain garden in square feet. First identify the size of the roof driveway or other surface that will divert water into the rain garden. If necessary you may want to amend the soil in your planting area. Natural looking and kidney bean shapes are popular.
Identify only the area of roof that deposits water into the downspout you ve targeted for the rain garden. Multiply your size factor by the drainage area to get your total garden size. Residential rain gardens are often sized to hold one inch of runoff in above ground storage from the contributing impervious surface. Determine rain garden size for 100 runoff control 1.
For the next steps in the planning process go to earth partnership for schools activities de signing a rain garden and rain garden species selection extensions. Measure the distance from the house and the width of the drainage area and add it to your roof figure and find the soil type for your garden. For example 600 square feet of my 1 200 square foot roof. The kind of soil you have will help determine the size of your rain garden.