Contents 1 Description and applications 2 Advantages 2.1 Managing runoff 2.2 Controlling pollutants 2.3 Trees 3 Disadvantages 3.1 Runoff Volumes 3.2 Pollutant load 3.3 Weight and traffic volumes 3.4 Siting 3.5 Climate 3.6 Cost 3.7 Longevity and maintenance 3.8 Efflorescence 4 Types 4.1 Pervious concrete 4.2 Plastic Grids 4.3 Porous asphalt 4.4 Single-sized aggregate 4.5 Porous turf 4.6 Permeable interlocking concrete pavements 4.7 Permeable clay brick pavements 4.8 Resin bound paving 4.9 Bound recycled glass porous pavement 5 See also 6 Notes 7 References 8 External links

Description and applications[edit] Permeable solutions can be based on: porous asphalt and concrete surfaces, concrete pavers (permeable interlocking concrete paving systems – PICP), or polymer-based grass pavers, grids and geocells. Porous pavements and concrete pavers (actually the voids in-between them) enable stormwater to drain through a stone base layer for on-site infiltration and filtering. Polymer based grass grid or cellular paver systems provide load bearing reinforcement for unpaved surfaces of gravel or turf. Grass pavers, plastic turf reinforcing grids (PTRG), and geocells (cellular confinement systems) are honeycombed 3D grid-cellular systems, made of thin-walled HDPE plastic or other polymer alloys. These provide grass reinforcement, ground stabilization and gravel retention. The 3D structure reinforces infill and transfers vertical loads from the surface, distributing them over a wider area. Selection of the type of cellular grid depends to an extent on the surface material, traffic and loads. The cellular grids are installed on a prepared base layer of open-graded stone (higher void spacing) or engineered stone (stronger). The surface layer may be compacted gravel or topsoil seeded with grass and fertilizer. In addition to load support, the cellular grid reduces compaction of the soil to maintain permeability, while the roots improve permeability due to their root channels.[2] In new suburban growth, porous pavements protect watersheds. In existing built-up areas and towns, redevelopment and reconstruction are opportunities to implement stormwater water management practices. Permeable paving is an important component in Low Impact Development (LID), a process for land development in the United States that attempts to minimize impacts on water quality and the similar concept of sustainable drainage systems (SuDS) in the United Kingdom. The infiltration capacity of the native soil is a key design consideration for determining the depth of base rock for stormwater storage or for whether an underdrain system is needed.

Advantages[edit] Managing runoff[edit] Permeable paving surfaces have been demonstrated as effective in managing runoff from paved surfaces.[3][4] Large volumes of urban runoff causes serious erosion and siltation in surface water bodies. Permeable pavers provide a solid ground surface, strong enough to take heavy loads, like large vehicles, while at the same time they allow water to filter through the surface and reach the underlying soils, mimicking natural ground absorption.[5] They can reduce downstream flooding and stream bank erosion, and maintain base flows in rivers to keep ecosystems self-sustaining. Permeable pavers also combat erosion that occurs when grass is dry or dead, by replacing grassed areas in suburban and residential environments.[6] Controlling pollutants[edit] Permeable paving surfaces keep the pollutants in place in the soil or other material underlying the roadway, and allow water seepage to groundwater recharge while preventing the stream erosion problems. They capture the heavy metals that fall on them, preventing them from washing downstream and accumulating inadvertently in the environment. In the void spaces, naturally occurring micro-organisms digest car oils, leaving little but carbon dioxide and water. Rainwater infiltration is usually less than that of an impervious pavement with a separate stormwater management facility somewhere downstream.[citation needed].in areas where infiltration is not possible due to unsuitable soil conditions permeable pavements are used in the attenuation mode where water is retained in the pavement and slowly released to surface water systems between storm events. Trees[edit] Permeable pavements may give urban trees the rooting space they need to grow to full size. A "structural-soil" pavement base combines structural aggregate with soil; a porous surface admits vital air and water to the rooting zone. This integrates healthy ecology and thriving cities, with the living tree canopy above, the city's traffic on the ground, and living tree roots below. The benefits of permeables on urban tree growth have not been conclusively demonstrated and many researchers have observed tree growth is not increased if construction practices compact materials before permeable pavements are installed.[7][8]

Disadvantages[edit] Runoff Volumes[edit] Permeable pavements are designed to replace Effective Impervious Areas (EIAs), not to manage stormwater from other impervious surfaces on site. Use of this technique must be part of an overall on site management system for stormwater, and is not a replacement for other techniques. Also, in a large storm event, the water table below the porous pavement can rise to a higher level preventing the precipitation from being absorbed into the ground. The additional water is stored in the open graded crushed drain rock base and remains until the subgrade can absorb the water. For clay-based soils, or other low to 'non'-draining soils, it is important to increase the depth of the crushed drain rock base to allow additional capacity for the water as it waits to be infiltrated. The best way to prevent this problem is to understand the soil infiltration rate, and design the pavement and base depths to meet the volume of water. Or, allow for adequate rain water run off at the pavement design stage. Pollutant load[edit] Highly contaminated runoff can be generated by some land uses where pollutant concentrations exceed those typically found in stormwater. These "hot spots" include commercial plant nurseries, recycling facilities, fueling stations, industrial storage, marinas, some outdoor loading facilities, public works yards, hazardous materials generators (if containers are exposed to rainfall), vehicle service and maintenance areas, and vehicle and equipment washing and steam cleaning facilities. Since porous pavement is an infiltration practice, it should not be applied at stormwater hot spots due to the potential for groundwater contamination. All contaminated runoff should be prevented from entering municipal storm drain systems by using best management practices (BMPs) for the specific industry or activity.[9] Weight and traffic volumes[edit] Reference sources differ on whether low or medium traffic volumes and weights are appropriate for porous pavements. For example, around truck loading docks and areas of high commercial traffic, porous pavement is sometimes cited as being inappropriate. However, given the variability of products available, the growing number of existing installations in North America and targeted research by both manufacturers and user agencies, the range of accepted applications seems to be expanding. Some concrete paver companies have developed products specifically for industrial applications. Working examples exist at fire halls, busy retail complex parking lots, and on public and private roads, including intersections in parts of North America with quite severe winter conditions. Siting[edit] Permeable pavements may not be appropriate when land surrounding or draining into the pavement exceeds a 20 percent slope, where pavement is down slope from buildings or where foundations have piped drainage at their footers. The key is to ensure that drainage from other parts of a site is intercepted and dealt with separately rather than being directed onto permeable surfaces. Climate[edit] This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. (July 2013) (Learn how and when to remove this template message) Cold climates may present special challenges. Road salt contains chlorides that could migrate through the porous pavement into groundwater. Snow plow blades could catch block edges and damage surfaces. Sand cannot be used for snow and ice control on perveous asphalt or concrete because it will plug the pores and reduce permeability. Infiltrating runoff may freeze below the pavement, causing frost heave, though design modifications can reduce this risk. Another issue is spalling damage. Spalling damage mostly happens on porous pavement made exclusively of concrete due to the salt application from the winter season. Thus it is not recommended for use in climates other than warm ones. However, other materials have proven to be effective, even lowering winter maintenance costs by preserving salt in the pavement itself. This also reduces the amount of storm water runoff that is contaminated with salt chlorides.[10] Porous pavement designed to reduce frost heave as well as spalling damage has been used successfully in Norway. Furthermore, experience suggests that preventative measures with rapid drainage below porous surfaces be taken in order to increases the rate of snow melt above. Cost[edit] Some estimates put the cost of permeable paving at two to three times that of conventional asphalt paving. Using permeable paving, however, can reduce the cost of providing larger or more stormwater BMPs on site, and these savings should be factored into any cost analysis. In addition, the off-site environmental impact costs of not reducing on-site stormwater volumes and pollution have historically been ignored or assigned to other groups (local government parks, public works and environmental restoration budgets, fisheries losses, etc.) The City of Olympia, Washington is studying the use of pervious concrete quite closely and finding that new stormwater regulations are making it a viable alternative to storm water. Longevity and maintenance[edit] Some permeable pavements require frequent maintenance because grit or gravel can block the open pores. This is commonly done by industrial vacuums that suck up all the sediment. If maintenance is not carried out on a regular basis, the porous pavements can begin to function more like impervious surfaces. With more advanced paving systems the levels of maintenance needed can be greatly decreased, elastomerically bound glass pavements requires less maintenance than regular concrete paving as the glass bound pavement has 50% more void space. Plastic grid systems, if selected and installed correctly, are becoming more and more popular with local government maintenance personnel owing to the reduction in maintenance efforts: reduced gravel migration and weed suppression in public park settings. Some permeable paving products are prone to damage from misuse, such as drivers who tear up patches of plastic & gravel grid systems by "joy riding" on remote parking lots at night. The damage is not difficult to repair but can look unsightly in the meantime. Grass pavers require supplemental watering in the first year to establish the vegetation, otherwise they may need to be re-seeded. Regional climate also means that most grass applications will go dormant during the dry season. While brown vegetation is only a matter of aesthetics, it can influence public support for this type of permeable paving. Traditional permeable concrete paving bricks tend to lose their color in relatively short time which can be costly to replace or clean and is mainly due to the problem of efflorescence. Efflorescence[edit] Main article: Efflorescence Efflorescence is a hardened crystalline deposit of salts, which migrate from the center of concrete or masonry pavers to the surface to form insoluble calcium carbonates that harden on the surface. Given time, these deposits form much like how a stalactite takes shape in a cave, except in this case on a flat surface. Efflorescence usually appears white, gray or black depending on the region. Over time efflorescence begins to negatively affect the overall appearance of masonry/concrete and may cause the surfaces to become slippery when exposed to moisture. If left unchecked, this efflorescence will harden whereby the calcium/lime deposits begin to affect the integrity of the cementatious surface by slowly eroding away the cement paste and aggregate. In some cases it will also discolor stained or coated surfaces. Efflorescence forms more quickly in areas that are exposed to excessive amounts of moisture such as near pool decks, spas, and fountains or where irrigation runoff is present. As a result, these affected regions become very slick when wet thereby causing a significant loss of "friction coefficient". This can be of serious concern especially as a public safety issue to individuals, principals and property owners by exposing them to possible injury and increased general liability claims. Efflorescence remover chemicals can be used to remove calcium/lime build-up without damaging the integrity of the paving surface.

Types[edit] Installation of porous pavements is no more difficult than that of dense pavements, but has different specifications and procedures which must be strictly adhered to. Nine different families of porous paving materials present distinctive advantages and disadvantages for specific applications. Here are examples: Pervious concrete[edit] Main article: Pervious concrete Pervious concrete is widely available, can bear frequent traffic, and is universally accessible. Pervious concrete quality depends on the installer's knowledge and experience.[11] Plastic Grids[edit] Plastic grids allow for a 100% porous system using structural grid systems for containing and stabilizing either gravel or turf. These grids come in a variety of shapes and sizes depending on use; from pathways to commercial parking lots. These systems have been used readily in Europe for over a decade, but are gaining popularity in North America due to requirements by government for many projects to meet LEED environmental building standards. Plastic grid system are also popular with homeowners due to their lower cost to install, ease of installation, and versatility. The ideal design for this type of grid system is a closed cell system, which prevents gravel/sand/turf from migrating laterally.[citation needed] It is also known as Grass pavers / Turf Pavers in India [12] Porous asphalt[edit] Porous asphalt is produced and placed using the same methods as conventional asphalt concrete; it differs in that fine (small) aggregates are omitted from the asphalt mixture. The remaining large, single-sized aggregate particles leave open voids that give the material its porosity and permeability. To ensure pavement strength, fiber may be added to the mix or a polymer-modified asphalt binder may be used.[13] Generally, porous asphalt pavements are designed with a subsurface reservoir that holds water that passes through the pavement, allowing it to evaporate and/or percolate slowly into the surround soils.[14][15] Open-graded friction courses (OGFC) are a porous asphalt surface course used on highways to improve driving safety by removing water from the surface. Unlike a full-depth porous asphalt pavement, OGFCs do not drain water to the base of a pavement. Instead, they allow water to infiltrate the top 3/4 to 1.5 inch of the pavement and then drain out to the side of the roadway. This can improve the friction characteristics of the road and reducing road spray.[16] Single-sized aggregate[edit] Single-sized aggregate without any binder, e.g. loose gravel, stone-chippings, is another alternative. Although it can only be safely used in very low-speed, low-traffic settings, e.g. car-parks and drives, its potential cumulative area is great.[citation needed] Porous turf[edit] Grass pavement Porous turf, if properly constructed, can be used for occasional parking like that at churches and stadia. Plastic turf reinforcing grids can be used to support the increased load.[17]:2 [18] Living turf transpires water, actively counteracting the "heat island" with what appears to be a green open lawn. Permeable interlocking concrete pavements[edit] Main article: interlocking concrete pavers Permeable interlocking concrete pavements are concrete units with open, permeable spaces between the units.[17]:2 They give an architectural appearance, and can bear both light and heavy traffic, particularly interlocking concrete pavers, excepting high-volume or high-speed roads.[19] Some products are polymer-coated and have an entirely porous face. Permeable clay brick pavements[edit] Permeable clay brick pavements are fired clay brick units with open, permeable spaces between the units. Clay pavers provide a durable surface that allows stormwater runoff to permeate through the joints. Resin bound paving[edit] Main article: Resin bound paving Resin bound paving is a mixture of resin binder and aggregate. Clear resin is used to fully coat each aggregate particle before laying. Enough resin is used to allow each aggregate particle to adhere to one another and to the base yet leave voids for water to permeate through. Resin bound paving provides a strong and durable surface that is suitable for pedestrian and vehicular traffic in applications such as pathways, driveways, car parks and access roads. Bound recycled glass porous pavement[edit] Elastomerically bound recycled glass porous pavement consisting of bonding processed post consumer glass with a mixture of resins, pigments, granite and binding agents. Approximately 75 percent of glass in the U.S. is disposed in landfills.[20][21]

See also[edit] Stormwater management practices related to roadways: Bioretention Bioswale

Notes[edit] ^ Interlocking Concrete Pavement Institute, ^ Stormwater Management, ^ Brattebo, B. O., and D. B. Booth. 2003. "Long-Term Stormwater Quantity and Quality Performance of Permeable Pavement Systems." Archived 2007-03-27 at the Wayback Machine. Water Research. 37: 4369–4376. doi:10.1016/S0043-1354(03)00410-X ^ United States Environmental Protection Agency (EPA). Washington, D.C. "Field Evaluation of Permeable Pavements for Stormwater Management, Olympia, Washington." Fact Sheet. October 2000. Document No. EPA-841-B-00-005B. ^ "Permeable Pavers". Retrieved 2017-05-15.  ^ Belgard. "Permeable Pavers". Retrieved 2017-05-15.  ^ Volder, A; Watson, Viswanathan (2009). "Potential use of pervious concrete for maintaining existing mature trees during and after urban development". Urban For. Urban Gree. 8 (4): 249–256. doi:10.1016/j.ufug.2009.08.006.  ^ Morgenroth, J; Visser (2011). "Aboveground growth response of Platanus orientalis to porous pavements". Arboriculture & Urban Forestry. 37 (1): 1–5.  ^ Capital Regional District. Victoria, BC. "Regulating Stormwater Discharges." Accessed 2010-03-19. ^ "Porous Pavement Performance in Cold Climates - The Stormwater Report". The Stormwater Report. 2012-01-05. Retrieved 2018-03-23.  ^ EPA. National Menu of Stormwater Best Management Practices. 2009-09-10. "Pervious Concrete Pavement." Archived 2010-06-22 at the Wayback Machine. ^ "Grass Pavers" / "Turf Pavers" ^ Hansen, Kent (2008). IS-131: Porous Asphalt Pavements for Stormwater Management. Lanham, Maryland: National Asphalt Pavement Association. p. 16.  |access-date= requires |url= (help) ^ National Asphalt Pavement Association. "Porous Asphalt". Retrieved 2013-01-15.  ^ National Menu of Stormwater Best Management Practices. 2009-09-10. "Porous Asphalt Pavement". Porous Asphalt Pavement. EPA. Archived from the original on 27 September 2012. Retrieved 18 September 2012.  ^ Caltrans (8 Feb 2006). Open Graded Friction Course Usage Guide (PDF). Sacramento, California. Retrieved 2013-01-15.  Check date values in: |year= / |date= mismatch (help) ^ a b Bean, Eban Z.; Hunt, William F.; Bidelspach, David A.; Smith, Jonathan T. (2004)."Study on the Surface Infiltration Rate of Permeable Pavements."[permanent dead link] North Carolina State University, Biological and Agricultural Engineering Dept. Raleigh, NC. ^ EPA. "Permeable pavers." Stormwater Management Best Practices. Accessed 2010-06-17. ^ National Menu of Stormwater Best Management Practices. 2009-09-10. "Permeable Interlocking Concrete Pavement". Permeable Interlocking Concrete Pavement. EPA. Archived from the original on 15 September 2012. Retrieved 18 September 2012.  ^ Solnik, Claude (2009-11-03). "Truth unclear on recycled glass in L.I." Long Island Business News. Ronkonkoma, NY: Dolan Media. Archived from the original on 2011-03-10. CS1 maint: BOT: original-url status unknown (link) ^ EPA (2009). "Municipal Solid Waste Generation, Recycling, and Disposal in the United States: Facts and Figures for 2008." Document no. EPA-530-F-009-021.

References[edit] Ferguson, Bruce K. (2005). Porous Pavements. Boca Raton: CRC Press. ISBN 978-0-8493-2670-7.  National Conference on Sustainable Drainage (UK) NOVATECH – International Conference On Sustainable Techniques And Strategies In Urban Water Management U.S. Federal Highway Administration. Turner-Fairbank Highway Research Center. McLean, VA. "Waste Glass." Recycled Materials in the Highway Environment. Accessed 2010-07-05.

External links[edit] Avoiding Stormwater Running and the Rain Tax Nitterhouse Masonry (US) PaveShare – Permeable Paving Resources Technical Note 14D – Permeable Clay Brick Pavements – Brick Industry Association (US) "Permable Paving & SUDS" – Precast Concrete Paving & Kerb Assn. (UK) Sustainable Drainage: A Review of Published Material on the Performance of Various SUDS Components – Construction Industry Research & Information Assn. (UK) "Pervious Concrete Pavement: An Overview" – National Ready Mixed Concrete Assn. (US) Aquastone – Porous paving technical data v t e Streets and roadways Types of road Limited-access Freeway / Motorway Dual carriageway / Divided highway / Expressway Elevated highway By country Australia Brazil China Croatia Czech Republic Germany Greece Hong Kong India Ireland Italy Pakistan Portugal Spain United Kingdom United States Main roads Arterial road Collector road County highway Express-collector setup Farm-to-market road Highway Link road Two-lane expressway 2+1 road 2+2 road Parkway Super two Trunk road Highway systems by country Local roads Alley Backroad Bicycle boulevard Boulevard Country lane Dead end Driveway Frontage road Green lane Main street Primitive road Road Side road Single carriageway Single-track road Street Sunken lane Other terms Channelization Concurrency Detour Hierarchy of roads Private highway Route number Special route Business route Street hierarchy Toll road Road junctions Interchanges (grade-separated) Cloverleaf Diamond Free-flow Directional T Diverging diamond Parclo Raindrop Roundabout Single-point urban (SPUI) Stack Three-level diamond Trumpet Intersections (at-grade) 3-way junction Bowtie Box junction Continuous flow Hook turn Jughandle Michigan left Offset T-intersection Protected intersection Quadrant roadway Right-in/right-out (RIRO) Roundabout Seagull intersection Split intersection Superstreet Texas U-turn Traffic circle Turnaround Surfaces Asphalt concrete Bioasphalt Brick Chipseal Cobblestone Concrete Reinforced concrete Corduroy Crocodile cracking Crushed stone Diamond grinding of pavement Dirt Full depth recycling Glassphalt Gravel Ice Macadam Pavement milling Permeable Plank Rubberized asphalt Sealcoat Sett Stamped asphalt Tarmac Texture Road hazards Aquaplaning Black ice Bleeding Crosswind Dead Man's Curve Expansion joint Fog Ford Hairpin turn Level crossing Manhole cover Oil spill Oversize load Pothole Road debris Road slipperiness Road train Roadkill Rockfall Rut Speed bump Storm drain Washboarding Washout Whiteout Space and time allocation Barrier transfer machine Bicycle lane Climbing lane Complete streets Contraflow lane Contraflow lane reversal High-occupancy toll lane High-occupancy vehicle lane Lane Living street Managed lane Median / Central reservation Motorcycle lane Passing lane Pedestrian crossing Pedestrian zone Refuge island Reversible lane Road diet Road verge Runaway truck ramp Shared space Sidewalk / Pavement Shoulder Street running railway Traffic calming Traffic directionality Traffic island Traffic lanes Traffic signal preemption Unused highway Wide outside lane Woonerf Demarcation Bollard Botts' dots Cable barrier Cat's eye (road) Concrete step barrier Constant-slope barrier Curb F-Shape barrier Guard rail Jersey barrier Kassel kerb Noise barrier Raised pavement marker Road surface marking Rumble strip Traffic barrier Traffic cone Structures Bridge Causeway Overpass / Flyover Underpass / Tunnel Glossary of road transport terms Road types by features Retrieved from "" Categories: PavementsBuilding materialsEnvironmental engineeringHydrology and urban planningWater conservationSustainable productsHorticulture and gardeningLandscapeHidden categories: Webarchive template wayback linksPages using citations with accessdate and no URLCS1 errors: datesAll articles with dead external linksArticles with dead external links from March 2018Articles with permanently dead external linksCS1 maint: BOT: original-url status unknownArticles needing POV-check from June 2010Articles that may contain original research from June 2010All articles that may contain original researchArticles with multiple maintenance issuesAll articles with unsourced statementsArticles with unsourced statements from June 2014Articles needing additional references from July 2013All articles needing additional referencesArticles with unsourced statements from April 2013Articles with unsourced statements from September 2012

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