1 / 79

Permeable Paving

Permeable Paving. Low Impact Development (LID). Low impact development  (LID) is an approach to managing stormwater runoff to protect water quality. Permeable Pavements. Permeable pavements are recognized as a Best Management Practice (BMP) by the U.S. Environmental Protection Agency

doria
Download Presentation

Permeable Paving

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Permeable Paving

  2. Low Impact Development (LID) • Low impact development (LID) is an approach to managing stormwater runoff to protect water quality

  3. Permeable Pavements • Permeable pavements are recognized as a Best Management Practice (BMP) by the U.S. Environmental Protection Agency • A cornerstone of low impact development (LID) design

  4. Non-Permeable Pavements • Increased runoff • Deprives groundwater • Pollutants • Non-point source

  5. Non-Permeable Pavements • 1990s average was about 30,000 miles of paving per year • Parking lots affect microclimates of city climates

  6. Non-Permeable Pavements • U.S. federal law mandates that states control water pollution in runoff through the National Pollutant Discharge Elimination System (NPDES)

  7. Advantages of Permeable Pavers • Increases the water quality • Increases groundwater • Reduces installation costs of drainage system • Reduces storm water runoff • Reduces flooding • Reduces erosion

  8. Permeable pavers • PICP (also called permeable segmental pavers) are non-porous, solid blocks made of brick, stone, clay or concrete

  9. Permeable pavers • Initially, infiltration is over 50-75in/hr. • Reduce by around 50% in the first 5 years. • Over a 20-year period, PICP’s are designed to achieve and maintain a consistent 3in/hr infiltration rate

  10. Permeable pavers • No sand used in joints • Clog pores

  11. Permeable pavers • http://www.youtube.com/watch?v=xBTYFo2z9HY&feature=related

  12. Permeable pavers • Cleaning should be done at least once a year • Removed by a vacuum-sweeping street cleaning machine

  13. Permeable interlocking concrete pavements • A North Carolina State University study has shown that the initial surface infiltration rate of PICPs can be as high as 2,000 in./hour. Other research has shown that near initial surface infiltration rates can be restored through cleaning and replacement of the initial 3/4 to 1 in. depth of small stones in the openings of PICPs.

  14. Permeable interlocking concrete pavements • Ice and snow can melt into the pavement • Water does not collect on the surface and re-freeze • Reduces slipping hazards

  15. Permeable interlocking concrete pavements • Sand should not be used for traction • Deicing salts can • Adequate space for the ice to expand within the open-graded base • Minimizing the risk of heaving.

  16. Pervious Asphalt and Concrete • Stone aggregate is held together with either asphalt or cement • Angular crushed stone, usually 3/8”, excluding fines that normally fill voids • Porous • http://www.youtube.com/watch?v=ScsQYHMfabU

  17. Pervious Asphalt and Concrete Ice doesn’t normally form in the paving or on the surface

  18. Pervious Asphalt and Concrete • Pervious paving may cost 10% more than conventional asphalt • Doubling as a stormwater system and eliminating storm drains, save 12% to 38% • Reduces retention ponds • Land area saved that would be used for basins

  19. Pervious Asphalt and Concrete Snow melts quickly and drains Soil around any porous installation must percolate minimum rate ½” per hour Contain no more than 30% clay

  20. Pervious Asphalt and Concrete • Most researchers found that proper design, installation and maintenance can prevent loss of porosity over time • Minor loss of porosity occurs in all porous materials over the first four to six years • One test, an inch of loose fine was applied • Full porosity was easily restore by a cleaning with a HydroVac

  21. POROUS ASPHALT • Formulated with larger aggregate and less fine particles • “Open-graded” surface drains and supports traffic • Single-sized aggregate particles leave open voids (typically between 25-35%) that give the material its porosity and permeability.

  22. POROUS ASPHALT • Beneath its surface, underlying stone reservoir that then filters water directly into the underlying soil, or storm-drain system

  23. POROUS ASPHALT • Asphalt version originally developed for airport runways • prevents dangerous surface ponding • Reservoir supports the porous surface and hold precipitation until it can percolate into the soil • Shallow as nine inches on some well-drained soils

  24. POROUS ASPHALT • Using crushed rock open graded to about two inches in size, almost 40% of the reservoir’s total volume will be waterholding voids • Choker course of half inch gravel is laid on top

  25. Cool asphalt • Increase pavements reflectiveness • Albedo • Asphalt can be lightened • Asphacolor • Colored at plant

  26. PERVIOUS CONCRETE • Grainier and less smooth than traditional concrete • Controlled amounts of water and cement materials bound with large aggregate particles • Contains little or no fines • Substantial void space between 25-35% • Runoff coefficient close to zero • Underlying stone reservoir

  27. PERVIOUS CONCRETE • Porous concrete withstands heavier and more repeated loads than porous asphalt • Does not soften under heat

  28. Grass Pave Grass will not survive daily traffic Grass for parking stays healthy if used not more than about one day a week, less in dry climates http://www.youtube.com/watch?v=wx-CNC7f5xY

  29. GRASS PAVERS • Open-cell unit paver in which the cells are filled with soil and filled with turf or gravel • Comprised of a grid system, which is made of concrete or synthetic to distribute the weight of traffic • Appropriate for • Foot traffic • Overflow parking • Driveway

  30. Grass Pave • Overflow parking

  31. Grass Pave • Fine gravel, oyster shells, or other permeable material can substitute for grass for more frequent parking

  32. Grass Pave • Use mix of sand and water polymers

  33. COST COMPARISON • Asphalt: $0.50 to $1 per square foot • Grass/Gravel Pavers: $1.50 to $5.75 per square foot • Porous Concrete: $2.00 to $6.50 per square foot • Interlocking Concrete Paver Blocks: $5.00 to $10.00 per square foot

More Related