Roof To Rain Garden Size

If necessary you may want to amend the soil in your planting area.

Roof to rain garden size.

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. Residential rain gardens are often sized to hold one inch of runoff in above ground storage from the contributing impervious surface. Water is absorbed fastest in sandy soils and slowest in clay like soils. For this exercise i ve used square feet as a measurement.

For example 600 square feet of my 1 200 square foot roof. In this area of the country the majority around 90 of storms are one inch or less in size. 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. The kind of soil you have will help determine the size of your rain garden.

The size and depth of the rain garden the infiltration rate of the soil the size of the uphill drainage area the amount of impervious or semi impervious surfaces rooftops driveways sidewalks and mowed turf in the uphill drainage area the slope of the site and the amount intensity and duration of rainfall all influence rain garden effectiveness in managing rainwater runoff. Multiply your size factor by the drainage area to get your total garden size. Most rain gardens are from 100 to 300 square feet. 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.

Determine rain garden size for 100 runoff control 1. Multiply total drainage area by the soil factor. Sizing your rain garden. Natural looking and kidney bean shapes are popular.