Rain garden construction detail

How is a rain garden built?

Create the rain garden by building a berm in a low spot in the yard, then build swales to channel runoff from the gutters and higher parts of the yard. The water is then absorbed into the soil through the network of deep plant roots. Use a mix of plants adapted to your area and to the different water depths.

What are the different layers of a rain garden?

The rain garden consists of a vegetated or stone ponding area, a mulch layer, a planting soil layer, a sand bed, and a gravel base. The multiple layers work together to filter pollutants from water , allowing it to infiltrate into the groundwater supply uncontaminated.

How effective are rain gardens?

Rain gardens are effective in removing up to 90% of nutrients and chemicals and up to 80% of sediments from the rainwater runoff. Compared to a conventional lawn, rain gardens allow for 30% more water to soak into the ground. A rain garden is not a water garden . Conversely, a rain garden is dry most of the time.

How do you build a rain garden in clay soil?

Try using a 2:1 ratio of the drainage area to the surface area of your garden (most rain gardens in better soils use approximately a 4:1 ratio). For instance, if your garden will be draining a 200 sq. ft. of rooftop, plan the surface area of your garden to be 100 sq.

What are the best plants for a rain garden?

Plants for sunny rain gardens Download PDF list Common Sneezeweed (Helenium autumnale) Culver’s Root (Veronicastrum virginicum) Flat-topped Aster (Aster umbellatus) Great Blue Lobelia (obelia siphilitica) Green-headed Coneflower (Rudbeckia laciniata) Joe-Pye Weed (Eupatorium fistulosum) Marsh Marigold (Caltha palustris)

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Do rain gardens attract mosquitoes?

Will rain gardens attract or breed mosquitoes ? No, not if properly constructed. A well-designed rain garden with mature plants will not have standing water in it after 48 hours; all the water will have soaked into the garden . In fact, rain gutters on homes are much more likely to produce mosquitoes than a rain garden .

What are the important parts of a rain garden?

A rain garden can be boiled down to three main components : plants, soils and cover. Rain gardens are made up of a bowl-like depression in the ground. On the downhill side (opposite side of where water will enter), a raised berm of soil is placed to allow water to sit in the garden are infiltrate into the soil.

Which plants soak up lots of water?

If you are looking for plants that absorb a lot of water, the following ten plants are a great choice. 1 – Ferns . 2 – Lily of the Valley . 3 – Daylilies. 4 – Indian Grass. 5 – Cattails . 6 – Iris . 7 – Elephant Ear . 8 – Monkey Flower.

How does a rain garden work?

A Rain Garden receives water from impervious (hard) surfaces such as rooftops, sidewalks, driveways and patios. By capturing storm water, Rain Gardens reduce the amount of runoff pollutants collected and flowing into stormdrains and out to our nearby streams, rivers and lakes.

How much does it cost to put in a rain garden?

Cost. The cost associated with installing residential rain gardens average about three to four dollars per square foot, depending on soil conditions and the density and types of plants used in the installation. Commercial, industrial and institutional site costs can range between ten to forty dollars per square foot.

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Do the rain gardens have standing water?

No. Because rain gardens are shallow and are only built on soils with sufficient drainage, they are designed to dry out before mosquitoes can reproduce. If it rains several days in a row, it is possible that your rain garden may have standing water until the rain stops and the water has time to soak in.

How do you maintain a rain garden?

Key Maintenance Tips Water regularly to promote plant growth especially during the first two years and dry spells. Inspect site following rainfall events. Prune and weed to maintain appearance. Replace mulch as needed. Soil fertilization is unnecessary as rain gardens are designed to absorb excess nutrients.

What is a rain water garden?

A rain garden is a system that collects water from paving, hard surfaces, roofs, and puts it through a filtering mechanism that removes nutrients and pollutants. The water can then be used to irrigate the garden or, can pass through the filtering system and be released into the drainage system.

How do you build a rain garden on a slope?

Rock weirs, or piles of stones intentionally placed to slow down runoff, can help prevent erosion on a hill. Likewise, using stones to create an alpine slide garden with a water feature is a good way to have a rain garden on a slope .