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What is Drainscape® Porous Paving?
Drainscape® porous concrete paving is a mix of coarse aggregate, cement, water, and little or no sand. Also known as pervious concrete, this mixture creates an open-cell structure, allowing rainwater to filter through to underlying soil. By modeling natural ground cover, pervious concrete is an excellent choice for stormwater management.
Benefits of porous paving:
- Reduces stormwater runoff
- Eliminates the need for detention ponds and other costly stormwater management practices
- Replenishes water tables and aquifers
- Allows for more efficient land development
- Minimizes flash flooding and standing water
- Prevents warm and polluted water from entering our streams
- Mitigates surface pollutants
Porous Paving FAQs
Q: What about freeze-thaw issues?
A: Porous paving has been placed in freeze-thaw climates for over 15 years.
Successful applications of pervious concrete in freeze-thaw environments have
two common design features: the cement paste is air-entrained and the porous
concrete is placed on 6-12 inches of drainable aggregate base (3/4" or larger
clean gravel).
Q: What about clogging?
A: Clogging problems are mainly an issue of design. If a natural area with grass
or exposed soil is allowed to drain stormwater across a porous concrete
pavement, fine material can be introduced into the system causing localized
clogging. Vegetative matter can collect on the surface of the porous concrete
causing some clogging, but routine sweeping or vacuuming will restore porosity.
Studies have been conducted that indicate pressure washing will restore most of
the porosity of clogged porous paving to nearly new conditions.
Q: What about drainage issues in soils with high clay content?
A: Typically if a soil type has sufficient percolation to support a septic tank
system it will be allowable for porous concrete. If a soil is truly impervious the
porous concrete system will still be useful for detention pond requirements. Soil
percolation rates are most important if you must meet stormwater quality
requirements. A typical parking lot design may have 5"-8" of porous pavement on
top of a 6"-12" sub-base of #57 stone (40% voids) on a geotextile fabric. In sandy
areas pervious is placed directly above the sand.
To learn more about porous paving or any of our products or services schedule a presentation for your office or group. Email info@coloradohardscapes.com or call 303-750-8200.
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Parking Lots |
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Low Volume Streets |
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Driveways |
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Sidewalks |
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Golf Cart Paths |
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Retaining Walls |
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Slope Protection |
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French Drains |
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