Rainscaping Guide: Select Other Rainscaping Options

Problem Areas to Avoid
Under some conditions, any kind of rainscaping (landscaping to manage stormwater) is not recommended. If the following conditions exist at your site, consider installing a rain barrel, vegetated roof or choose another site to rainscape:

  • over septic systems
  • in contaminated soils or groundwater
  • adjacent to a karst sinkhole leading directly to groundwater reservoir
  • for runoff from vehicular areas, in wellhead protection areas or within a horizontal distance of 2× the depth of any nearby wells
  • within 10–20 feet of footings, pavement or any building, including those on neighboring properties
  • within 5 feet of the property line

Managing Challenging Areas
Under other challenging landscape conditions, rain gardens are not recommended but other viable landscaping alternatives exist.

Utilities: Choose short stature plants to plant underneath overhead utility lines. Do not install rain gardens or trees over underground utilities. Call 1 (800) DIG-RITE to find out where the underground utilities are located.

Address other challenging landscape features (click on each topic below to show that section):

Select Other RainScaping Options flowchartStabilize Steep Slopes

Plantings
Steep slopes that are difficult to manage can be planted with low-maintenance trees, shrubs, and perennials to stabilize the soil and make it more permeable. This helps slow down run-off and prevent erosion and, in addition, decreases maintenance while enhancing aesthetics and habitat. Use of biodegradable erosion netting is recommended during the plant establishment phase. There are many forms of biodegradable erosion fabric, such as mats, netting or blankets. Never leave steep slopes with bare soil exposed.

Check Dams
Check dams are placed perpendicular to the flow of water so that water flows through or over (not around) them, thus slowing down the water and controlling erosion and sedimentation. Check dams may be compost socks, straw wattles or rock weirs.

A compost filter sock check dam is a flexible mesh tube, or tubular ‘sock,’ made of a permeable cloth that is filled with compost and anchored into place. They are available as either a permanent or a biodegradable product and may be vegetated (planted) if desired. Planting trees or shrubs on or by the compost sock will help anchor it as the plant roots grow. An advantage of the compost filter sock is that it filters pollutants and sediment as the water flows through the sock dam.

Rock weirStraw wattles are similar to compost sock dams in that they are a mesh tube filled with straw but they are not typically planted.

A rock weir is a pile of stones lined up to slow down the flow of water on a hill. An advantage of the rock weir is that it can be a more stable structure, more able to withstand high velocity flow on a steep slope.

Terracing
Check dams can be back-filled with topsoil and vegetation to form terraces that will stabilize a steep slope, to increase both infiltration and evapotranspiration rates, and to help prevent soil erosion.

Bioswales
If water is coming from a concentrated source (such as from a parking lot stormwater outlet or gutter downspout), a meandering bioswale punctuated by rock weirs will capture the runoff and help to prevent erosion by slowing the flow of water down the hillside.

See Erosion & Sediment Control Resources section.

 

Link to Work Wonders with Woodlands section Link to Conquer Compacted Soils section Link to Stabilize Steep Slopes section Link to Let Loose on Low Wet Areas section Link to Transform Turf section Link to Design & Build a Rain Garden page Link to Select Plants page
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The Missouri Botanical Garden Rainscaping Guide is partially funded by the Mabel Dorn Reeder Foundation and US EPA Region 7 through the Missouri Department of Natural Resources (subgrant number G11-NPS-15), under Section 319 of the Clean Water Act.