Design Of Rain Garden Nrcs Method

The document takes you through the six simple steps involved in designing a rain garden. Soil for your rain garden. The rain garden should be level across the bottom of the bed.

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Measure the square footage of the impervious area length x width.

Design of rain garden nrcs method. Then multiply this by 0 07 7 percent. Shapes of rain gardens. A rain garden can be designed into any shape oval rectangle or kidney bean shape as long as it is positioned to receive rainwater runoff easily.

Q u a l i t y a m e n i t y q u a n i t y. Rain gardens should be dug to a depth of approximately 85 centimetres or deeper if you re building a small rain garden. A typical grassed lawn can be easily retrofitted with a beautifully landscaped rain garden.

To simply test a soil s ability to absorb water. Rain gardens can be any shape but make the border of the rain gar den blend in with the surrounding landscape in a pleasing manner. Remove vegetative cover from the surface area of the rain garden.

Once width and depth are determined you can dig. The overflow structure allows water to exit the rain garden when the ponding area becomes full. If sod is present dig it up or kill it chemically.

A perforated pvc underdrain is necessary for rain gardens built in soil with slow infiltra tion. Avoid rotor tilling sod as root chunks may survive and cause competition with rain garden plants. Determine rain garden size for 100 runoff.

Dig a wide hole 10 inches deep and fill it with water. If on a slope this berm goes on the lower end of the slope. The ground under a rain garden should not be packed down so try to stand outside of the garden area as much as you can and avoid placing any heavy instruments or machinery inside the digging area.