Pervious Pavement Maintenance For Your Community

  • Pervious pavement is a specialized type of pavement that allows water to pass and filter directly through its porous structure. This reduces the water runoff from a site, allows groundwater recharge and limits the surface’s contribution to stormwater. Pervious pavement includes pervious concrete, asphalt, and interlocking concrete pavers.
  • Properly maintaining pervious pavement will result in optimal performance, an operable infiltration rate, increased safety, reduced overall costs, and can prevent the need for total restoration. When needed, cleaning is performed by sweeping, vacuuming, and wet vacuuming to remove accumulated deposits. Each facility or project will have its own unique maintenance plan and schedule.
  • Pervious pavement is designed to allow stormwater to filter through its surface where it then passes through soil and removes pollutants.  This reduces these pollutants from entering storm drains, streams and lakes. However, pervious/porous surfaces can accumulate solids where the surface will no longer percolate as designed.
  • Triverus’ pervious pavement maintenance services will ensure your surfaces are functioning as designed, preventing stormwater pollution and potential damage to your property.
  • Pervious pavement maintenance is performed with the Triverus Municipal Cleaning Vehicle (MCV), a versatile and highly-efficient machine featuring a 60-inch wide cleaning deck, the widest available in this class of cleaner and the most productive in the industry.

 

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How Does Pervious Pavement Fail?

Foreign material and organic deposits such as leaves, dust, and pine needles accumulate on pervious pavement. “Macro-plugging” forms a blocking layer on top of the pavement’s porous structure, preventing water from penetrating the surface. Furthermore, if these organic deposits are not removed regularly, they begin to degrade and begin to plug below the pervious pavement’s surface. This process limits the functionality of the pervious pavement, leading to increased water runoff, less groundwater recharge, and more contribution to stormwater.

According to the State of Washington’s Industrial Stormwater General Permit Coverage, “Uncontrolled industrial storm water runoff discharges oil, grease, silt, and toxic substances into our waterways. Even small concentrations of polluted runoff are bad for fish and other aquatic life. Copper and zinc, which are commonly found in industrial runoff, are harmful to salmon and other aquatic life, even at relatively low concentrations”

In the Before photo to the left, organic deposits are clearly visible on top of the interlocking pervious pavers and aggregate. In the After photo, the pavers have been swept and cleaned, restoring the functional permeability and leaving behind only the aggregate between the pavers. All types of pervious pavement must be cleaned to maintain permeability. Routine inspection of your pervious surfaces will allow you to monitor any buildup and assess performance.

 

 

 

Common Misconceptions About Maintaining Pervious Pavement

 

 Fiction

  • Pervious parking lots, sidewalks, or other areas can be maintained just like a conventional non-pervious surface.
  • It is possible for pervious pavement to be so clogged, replacement is the only way to restore percolation functionality.
  • Routine maintenance of pervious pavement is expensive.
  • Maintenance of pervious pavement is time intensive.
  • Pervious pavement can’t be maintained in freezing
    temperatures.
  • Pervious pavement clogs from the top down.

Fact

  • To perform properly, pervious pavement requires specific maintenance that differs from conventional maintenance.
  • Almost all intact pervious surfaces can be restored to percolation functionality.
  • Routine maintenance is affordable and is much less expensive than total restoration.
  • Routine maintenance can be performed quickly, with little down-time. Routine maintenance ultimately takes much less time than total restoration or replacement.
  • Pervious pavement can be maintained and will perform in freezing temperatures. They do have to be cleared of snow and ice differently than conventional surfaces.
  • Pervious pavement clogs from the top down. Organic and inorganic deposits break down on the surface and clog the permeable structure’s voids.

Pervious Surface Inspection

 

ISSUE: ORGANIC DEPOSITS

Organic deposits such as leaves, pine cones, and pine needles, collecting on pervious surfaces is normal.

REMEDY:

Consistent, immediate cleaning will help prevent the need for deep cleaning or full restoration

Cleaning with a blower (leaf blower or similar equipment),
truck-sweeping, dry vacuuming, and/or vacuum sweeper fitted with water jets.

ISSUE: LANDSCAPING RUNOFF

Mulch, dirt, or grass can be deposited from upland or adjacent grassy areas that have loose soil or improper water flow. This is also caused by “track on/track off” deposits left by vehicles or workers leaving nearby worksites and travelling across the pervious pavement.
REMEDY:
  • Maintain upland and adjacent grassy areas
  •  Seed upland and adjacent bare areas
  • Excessive water flow carrying debris toward the pavement should be diverted
  •  Minimize “Track on/track off” deposits

What To Look For

 

Issue: Spalling

Spalling is caused by winter salt application leading to thawing and refreezing underneath the surface. This causes the surface to pop out, peel off, or flake off.
Remedy:

  • Repair
  •  Limit or stop use of salt in winter months
  • Initiate deep cleaning protocol prior to snowfall
    and cold weather

Issue: Moss Growth

Moss growth is caused by clogged pavement pores.

Remedy:

  • Remove organic and inorganic deposits by aggressive pressure washing and vacuuming
  • Apply baking soda to the surface and vacuum within one to two weeks. Additionally, moss growth can be controlled with applications of limewater

 

 

Issue: Puddling

Puddling is caused by clogged pavement pores, which in turn
limits the permeability of the surface.

Remedy:

  • Test with perking process
  • Remove organic and inorganic deposits by aggressive pressure washing and vacuuming

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