Green Infrastructure

What is stormwater?  It's water from rain or melting snow.  Watch the video above and learn about rain water runoff and why it can be a problem. 

landscaped yard

Landscapes which are sustainably designed, installed and managed conserve water, lower the rate and volume of runoff water from rain, snowmelt and irrigation, and help reduce the amount of pollutants reaching surface water. Water related benefits achieved with sustainable residential, business, and community landscapes include:

  • More water soaks into soil and less water runs off of a property.
  • Roots and soil filter some pollutants from water.
  • Fewer pollutants (e.g. soil, fertilizer, pesticides, yard waste) carried off of a property in rain water.
  • Temperature of runoff water cools before reaching surface water.
  • Percolation of water through soil increases, helping replenish groundwater reserves.
  • Plant roots stabilize soil reducing soil erosion.
  • Conservation of water by reducing need and frequency of supplemental irrigation.

Properties tend to be graded and landscapes designed to direct rain and snowmelt off of a property. It is important for rain water to drain away from buildings and not form stagnant pools. However, a new landscape design trend is to capture (harvest) rainwater and melting snow to reduce the rate and the amount of water running off of a property. This allows it to infiltrate soil or be reused for landscape irrigation. Capturing runoff in this way helps reduce potential pollutants in runoff water and can reduce the demand on the drinking water supply. 

Key Landscape Design Practices

  • Install rain gardens in locations where they catch and temporarily hold rainwater.
  • Use natural drainage patterns, site grading, berms (planted earth mounds) or other methods to channel rainwater away from impervious surfaces (i.e. pavement) onto planted areas such as grass swales, filter strips, or rain gardens.
  • Plant and maintain healthy plant cover, especially on slopes to stabilize the soil and prevent erosion. Select plants adapted to the site and maintenance level.
  • Avoid planting high maintenance turfgrass on steep slopes, next to water's edge, or in areas not conducive to healthy turf growth or reasonable maintenance access.
  • Plant shade trees whose leaves intercept and slow down the rate of rainfall, and whose roots use soil moisture allowing for increased water infiltration.
  • Consider using native plants in our landscape.  They look great without much water or fertilizer.
  • When reseeding/establishing a lawn, use grasses that are well adapted to local conditions and your needs.
  • Minimize the amount of area covered by paved surfaces. Where feasible, use permeable materials such as bricks, interlocking pavers, porous concrete, mulch, or others.
  • Take an active role in developing the property design during new home construction or landscape renovation projects, before grading and construction begins.

Key Landscape Management Practices

  • Aim downspouts towards planted areas or pervious hardscape and away from impervious paved areas.
  • Collect rainwater from rooftops in rain barrels or cisterns for reuse in landscape irrigation.
  • Amend soil with organic matter. Core aerate lawns to help avoid or reduce soil compaction, increase water infiltration, and promote healthy root systems.
  • Follow University and label recommendations and calibrate spreaders when using fertilizers and pesticides.  Only use these products when needed. Read and follow label directions for all lawn chemicals.
  • Use water conservation practices. Avoid water runoff during irrigation . Avoid excess irrigation which leads to saturated soils that can increase water runoff. See the Water Measurement tool under Lawn and Landscape Irrigation for more information.
  • Keep potential pollutants (e.g. soil, fertilizer and pesticide granules, and grass clippings) off paved areas. Do not sweep or hose these into the street, but onto planted areas or use in compost.
  • Rake and compost tree leaves.
  • Clean grass clippings and tree leaves from street gutters.
  • Mow before the grass gets too tall and leave grass clippings on the lawn to promote healthy turf.
  • Do not stockpile soil, mulch, or other bulk materials on paved surfaces during lawn and landscape projects.
  • Pick up pet waste and put in the trash.
  • Use best plant care practices when planting and maintaining plants to promote vigorous growth and healthy roots. For further information visit the UNL Extension Horticulture site.

Well designed landscapes are aesthetically pleasing, functional, and sustainable. They can help protect the environment, add to property values, and enhance quality of life. For more information on home landscaping, order the UNL publications booklet, "Home Landscape: Understanding the Basics of Design" (Cost: $6.50).

Rain Garden Video

You can reduce water runoff from your yard by planting a rain garden. A rain garden is a small depression planted to flowers and ornamental grasses. It is designed to temporarily hold and soak in rain water from a roof, driveway or open area. A rain garden is not a pond or wetland. It is dry most of the time and holds water after a rain. Water collected in the rain garden slowly soaks into the soil and disappears in less than 48 hours.

Green roofs help manage stormwater by capturing rainfall.  This video discusses stormwater management and the benefits of green roofs. 

 

Permeable Pavers

Picture of a permeable paver

Permeable pavers let water pass through the spaces between them which are often filled with small gravel or sand. 

 

Permeable pavements help reduce the amount of stormwater runoff because they allow water to soak through the pavement and into the soil below.  Please watch the above video to learn more about permeable pavement.

Permeable pavements usually have a gravel or rock filled reservoir underneath to hold the water that passes through.  If the soil does not let water soak in or it soaks in extremely slowly, the water held in this reservoir may be slowly released into the storm drain system.  Even though the amount of runoff isn't reduced, the runoff is delayed so it doesn't enter the storm drain during the height of the storm. This helps reduce stream erosion and can reduce flooding potential. 

Pervious concrete or porous asphalt are probably not feasible for a single home project.  But permeable pavers could be a beautiful alternative to the usual concrete patio or driveway. 


 

Information presented within the lawn and landscape section of this Water Web site has been reviewed by University of Nebraska-Lincoln Stormwater and Greenspace Team. Members include Erin Bauer, Sarah Browning, Kathleen Cue, John Fech, Kelly Feehan, Thomas Franti, Bobbi Holm, Elizabeth Killinger, Katie Pekarek, Steve Rodie, Jim Schild, Dave Shelton.

 

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