Design Of Rain Garden Nrcs Method

Use table 2 for rain gardens 30 feet or more from the downspout and rain gardens collecting water from lawn areas.

Design of rain garden nrcs method. 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. Rain gardens sited for single family homes are typically 5 to 10 percent the size of the impervious surface generating the runoff entering the garden. Rain gardens should be dug to a depth of approximately 85 centimetres or deeper if you re building a small rain garden.

The document takes you through the six simple steps involved in designing a rain garden. Determine rain garden size for 100 runoff. Soil removed from the rain garden can be mounded up around 3 4 of the bed.

1 choose the right location 2 composition of a rain garden 3 calculate the size and depth 4 consider infiltration 5 manage flows 6 select the planting. Rain gardens provide multi facet benefits to your property neighborhood and city. Once width and depth are determined you can dig.

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. Rain gardens can be any size and.

The rain garden should be level across the bottom of the bed. Remove vegetative cover from the surface area of the rain garden. The overflow structure allows water to exit the rain garden when the ponding area becomes full.

The two tables are different because some water will infiltrate as it flows over the lawn for 30 feet or more. Then multiply this by 0 07 7 percent. Use the table 1 for rain gardens closer than 30 feet from the downspout.