Bioslope

Bioslopes

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Green Infrastructure

Bioslopes are linear BMP with a permeable media that allows stormwater runoff to infiltrate and filter through the practice before exiting through an underdrain.
 

Maintaining Bioslopes

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Typically bioslopes are indistinguishable from surrounding areas, so it is recommended that the BMP be staked with markers. If markers are used, they should be placed at both ends at the toe of the slope and every 50 feet.

Routine maintenance should be performed on bioslopes. Generally, this consists of removing debris and trash that could cause clogging, mowing and removing grass clippings.

In addition to routine maintenance, bioslopes require seasonal and intermittent maintenance. For example, in case of snow, ensure that snow does not pile up in the bioslope. Check to make sure that materials used to de-ice the surrounding areas stay out of the practice to avoid clogging and further pollution.

After a large rainstorm, keep drainage paths, both to and from the area, clean to promote sheet flow and allow stormwater runoff to be routed in the intended direction.

If the bioretention area is not draining properly, check for clogging in the underdrain and inlet and outlet structures.

Common Bioslope Issues

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Here are some of the common problems to be aware of when maintaining a bioretention area. They include, but are not limited to, the following:

  • Sediment build-up
  • Clogging in the inlet and outlet structure as well as the underdrain
  • Undesirable vegetation
  • Erosion
  • Mowing the grass filter strip
  • Compaction 


Should the bioslope become a breeding ground for mosquitoes, the problem is likely with the soil media or the overflow structure. 

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Bioslope

Routine Maintenance Schedule
Schedule
Activity
As needed or 4 times during growing season
  • Clear debris in inlets and outlets.
  • Mow and stabilize the area surrounding the bioslope.
  • Remove grass clippings.
  • Ensure that activities in the drainage area minimize oil/grease and sediment entry to the system.
  • Remove trash and debris.

Monthly
  • Stabilize eroded areas on the bioslope.
  • Ensure that flow is not bypassing the facility.
  • Ensure that no noticeable odors are detected outside the facility.
  • Mow the bioslope grass using a retractable arm mower to avoid compaction. Grass height should be mowed to a height of 6 to 15 inches.
  • Remove grass clippings

Annually
  • Ensure that gravel spreader or other structural elements of the bioslope are in good condition and free of debris.
  •  
    Test the permeability of the bioslope media using a hydraulic conductivity test. Replace the media as needed.
  •  
    Flow test the cleanouts to look for signs indicating the underdrain system is clogged.
  •  
    Evaluate sediment accumulation and remove once it reaches or exceeds a depth of 3 inches.