The tests concluded that if clogged, filterpave can be easily rejuvenated while porous asphalt and pervious concrete remain mostly clogged. General information on the composition of pervious concrete is provided, along with a summary of its benefits, limitations, and typical properties and characteristics. Pervious pavement porous pavement, porous concreteasphalt p ervious pavement is made of either pervious asphalt or pervious concrete. The porous pavement curve number thomas ballestero, pe, phd, ph, cgwp, pg, federico uribe.
The design for application of porous asphalt consists of at least four layers. Pervious concrete used in pavement systems must be designed to support the intended. Two factors determine the design thickness of pervious pavements. The porous asphalt pavement specified herein is modified after the national asphalt pavement association napa specification outlined in design, construction, and maintenance guide for porous asphalt pavements, information series 1 2003. Also, napa offers two publications, porous asphalt pavements for stormwater management is 1 and structural design guidelines for porous asphalt pavements is 140. Standard pavement applications where stormwater infrastructure is required materials cost is 2025% more than traditional asphalt longterm maintenance is required by routine quarterly vacuum sweeping. Office of asset management, pavements, and construction. Permeable pavement design guidelines design of permeable pavement systems is critical if they are to function properly and efficiently. It is typically designed to capture rainfall on the pavement surface area, but may also accept runon from adjacent impervious areas and other hardscapes sidewalks, rooftops, or gutters. Standard pavement applications where stormwater infrastructure is required materials cost is 2025% more than traditional asphalt longterm maintenance is.
Pervious concrete pavement maintenance and operations guide. The differences of pervious, permeable, and porous asphalt. The major design goal of permeable pavement is to maximize runoff reduction. Porous asphalt pavements with stone reservoirs fhwa. In july 2006, ncdenr began to credit permeable pavement with runoff reduction. Removal is accomplished through absorption, filtration and microbiological degradation. This guide is the standard that designbuilders shall be held to in the development of new pavement design sections and preservation rehabilitation of existing pavement sections on designbuild projects. Porous asphalt pervious concrete permeable interlocking pavers. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext.
Pervious concrete is most common today, but porous asphalt, interlocking concrete pavers, concrete grid pavers, and plastic reinforced grids. Impervious to pervious areas should be less than a. Design of porous asphalt pavements there are three considerations required when determining the thickness of the layers of porous pavements. Permeable pavement design guidelines september 2010 attachment 2. In many cases, it can be used instead of conventional, impervious pavements for both vehicular and pedestrian traffic, without the need. See more ideas about pavement, porous pavement and pervious pavers. Those in the industry dont think twice about terms like hotmix or sealcoating, but for the layman, these can be confusing. Permeable pavement fact sheet information for howard county, maryland homeowners. Total project cost is comparable for porous asphalt with reduced stormwater infrastructure vs. Freezethaw resistance of pervious concrete depends on its.
Porous pavement area may be considered 100% pervious in water quality calculations, thus reducing the size of required water quality facilities. Porous asphalt pavements offer developers and planners a new tool in their toolbox for managing storm water. Asphalt paving design guide asphalt pavement association. Pouredinplace pervious asphalt requires the same mixing and application materials and the same blacktopappearance of traditional impervious asphalt. Greening the urban environment 2528 september 2011 1. P1 porous asphalt pa p2 pervious concrete pc p3 permeable interlocking concrete pavers picp or concrete grid pavers cgp p4 plastic grid pavers. Picp is a flexible pavement like asphalt picp crosssection permeable paver wearing course. Design concept of porous asphalt pavement is to evaluate the performance of the. Design and contruction of a porous asphalt stormwater bmp epa. Example of stone edge for alternate path to bed and. Permeable pavement fact sheet information for howard county. For porous asphalt pavements expected to carry truck loads. Other variations of permeable pavement that are ddoeapproved permeable pavement surface materials are also encompassed in this section. Pervious concrete pavement maintenance and operations.
This techbrief presents an overview of pervious concrete and its use in pavement applications. These pavements, used mostly for parking lots, allow water to drain through the pavement surface into a stone recharge bed and infiltrate into the soils below the pavement. The area and shape are dependent on the site design, and selection of the surface material is. To this end, designers may choose to use a baseline permeable pavement design level 1 or an enhanced design level 2 that maximizes runoff reduction. Pervious concrete used in pavement systems must be designed to support the intended traffic load and contribute positively to the site. In addition, mndot design methods, approved mechanistic principles, and manufacturers specific recommendations should be consulted. Additional design criteria may be found, beginning on. In particular, never use asphalt or other tartype sealers on pervious concrete. Pavement surface design permeable pavement surface materials and installation shall be in accordance with industry standards for their intended use. As a result, the pervious concrete pavement structure was designed with the intent to minimize the extent of changes to profile elevation. Porous asphalt the specs tim horton, skillings connolly jessica knickerbocker, city of tacoma mark a. The right choice for porous asphalt porous pavements.
Is 1 is a design guide that takes the reader from site design through maintenance for porous asphalt pavements, while is 140 provides guidance on using the aashto 93 design. The graphic below illustrates the basic elements common to a variety of pervious pavement systems and the flow of runoff through the system. Improper winter maintenance has been responsible for many failures of pervious concrete pavement surfaces. It will also discuss issues including soil and subsurface conditions, infiltration, water quality, construction, and maintenance. Presentation to the mystic river steering committees municipal subcommittee on november 15, 2012. Some terms that often get mixed up are pervious, permeable, and porous. The right choice for porous pavements 26 hot mix asphalt technology septemberoctober 2003 porous. This technical brief provides an overview of the benefits. Permeable pavement alternatives to traditional pavement on our paved surfaces can help reduce runoff by infiltrating rain water and melting snow.
For porous pavements carrying light automobile traffic only, the structural requirements are not significant, and the material thicknesses are determined by the hydrological design and minimum thicknesses required for porous asphalts. A rhode island stormwater design manual 10 provides key. Pervious concrete no fines concrete creates void structure that allowing for quick drainage of water. Profile view porous pavement basics the following design criteria apply to all pervious paving systems. Using mixes to reduce runoff in 1970s geotextiles developed in 1979 current design process used since 1980.
Permeable pavement fact sheet information for howard. These alternative materials which include pervious asphalt, pervious concrete, interlocking pavers, and plastic grid pavers, allow rain and snowmelt to seep through the surface down. Porous asphalt pavement refers to the compacted mix of modified asphalt, aggregate, and additives. Activity schedule avoid sealing or repaving with impervious materials. This technical brief provides an overview of the benefits, limitations and applications of porous asphalt pavements with stone reservoirs. Important considerations in mix proportioning, hydrological design, structural. Porous asphalt pavements california coastal commission.
Hydrology, design, installation, maintenance and cost below we highlight several websites, publications and presentations that include design, maintenance and cost information related to porous asphalt, pervious concrete and permeable paving blocks. Porous asphalt pavements with stone reservoirs are a. Porous asphalt the specs washington asphalt pavement. Design and select the thickness of a porous asphalt pavement suitable to carry. The presentations will also include ontheground experience through case studies and approaches for permeable pavements in arid climates. While the specific design may vary, all permeable pavements. Slope of pavement surface should be less than 5% aggregate for reservoir bed should be approximately 1 to 3 inches in diameter. Porous asphalt pavement wisconsin asphalt pavement association. Pervious pavement is designed primarily to promote stormwater infiltration and improve the quality of stormwater runoff. Partial exfiltration design option when subgrade infiltration rates are low less than 0.
Types of permeable pavement numerous types of permeable pavement are available. Comparative properties of the three major permeable pavement types design factor porous concrete pc porous asphalt pa. A variety of permeable pavement surfaces are available, including pervious concreteporous asphalt, and permeable grid pavers and interlocking concrete pavers. The formula is different with small stone and fine particulate matter being removed and the quantity of tar reduced. Such pavements have been proving their worth since the mid1970s. As this was the first pervious pavement design by mto, the design incorporated conservative assumptions regarding. Considerations for design and construction, as well as maintenance, are discussed. Both materials resemble conventional asphalt and concrete, but have more air spaces that allow water to pass through the pavement into a reservoir base of crushed aggregate, then infiltrate into the ground. Design and contruction of a porous asphalt stormwater bmp. Cross section of typical porous asphalt pavement with stone reservoir image courtesy of fhwa unlike conventional pavements, porous asphalt pavements figure 1 are typically built over an uncompacted subgrade. Pap also known nationally as porous asphalt pavement, and permeable.
Wre, james houle, cpswq university of new hampshire stormwater center university of new hampshire philadelphia low impact development symposium. A pervious pavement design example has been developed and is included. Design factor porous concrete pc pervious asphalt pa permeable interlocking concrete pavers picp scale of application small and large scale paving applications small and large scale. The general guidelines for the porous asphalt pavement design are. To keep the system clean throughout the year and prolong its lifespan, the pavement surface should be. Lid permeable pavements washington stormwater center. To qualify for level 2, the design must meet all design criteria shown in the right hand column of table 3. Pervious pavement does function in the removal of pollutants. Cahill associates has been involved in the design and construction of more than 200 porous asphalt pavements since the 1980s and have reported no failures of pavements for which proper design and construction practices were followed. Many porous pavements have been constructed since the late 1970s. Wapa porous asphalt mix design recommended specifications. Pervious asphalt, pervious concrete, and permeable pavers can. Study investigates designed to manage and treat storm water runoff.
Design and contruction of a porous asphalt stormwater bmp retrofit. Nrmca pervious concrete pavement maintenance and operations guide the following chart can serve as a minimal recommendation for scheduled maintenance. Pdf rain water falling on the bituminous surfaces of parking lots, internal. Rigid pavement structure different from asphalt or pavers which are flexible pavement systems photo from. Pervious pavement 36 114 crushed stone choker course 14 38 peagravel reservoir course 4 6 subbase design matches that of the unhsc porous asphalt parking lot 4. Porous asphalt pavements allow for land development plans that are more thoughtful, harmonious. Pdf laboratory performance of porous asphalt pavement. A porous asphalt bmp is a bmp where the surface is composed of. Pervious concrete pavement maintenance and operations guide 5 winter maintenance this is a critical aspect of owning a pervious concrete pavement. This brochure will not address hydrologic design, as this should be performed by a licensed engineer proficient in hydrology and stormwater design. Porous asphalt pavements sometimes denoted as permeable pavements or. Landscape architecture design pdf though landscape gardening jobs in fife within landscape.
Design and contruction of a porous asphalt stormwater bmp retrofit an epa education and outreach project author. Permeable pavement 190 tennessee permanent stormwater management and design guidance manual table 2. Comparaive properies of 3 major permeable pavement types. March 2015 porous asphalt the specs washington asphalt paving association 7 sieve size. Permeable pavement is a method of paving that allows stormwater to seep into the ground as it falls rather than running off into storm drains, waterways and eventually the chesapeake bay. The pavement design guidelines included herein are to be used for the design of all new and rehabilitated projects in north carolina. Asphalt paving design guide asphalt pavement association of. Unhsc design specifications for porous asphalt pavement. Use of this manual will result in improved asphalt pavement quality and performance throughout the state of oregon. This design guide is consistent with the standard specification and covers the applications not included in the oregon standard specifications for construction.
It did this by allowing certain designs of permeable pavement to be treated as if they. Porous asphalt pavement and infiltration beds design specifications. Porous pavement also known as permeable and pervious pavement is a stormwater management facility that allows water to move through void spaces within the pavement and eventually infiltrate into underlying soils. Structural design of porous asphalt pavements tuesday, july 17. Design criteria for permeable pavement minnesota stormwater. The porous pavement curve number thomas ballestero, pe, phd, ph, cgwp, pg, federico uribe, robert roseen, pe, phd, d. The use of pervious pavement may be coupled with other stormwater management practices such as bioretention and vegetative swales for optimum drainage results. Feb 25, 20 take asphalt if youre just learning about it, terminology can be a barrier. Porous asphalt hansen 2008 and permeable interlocking pavements use flexible pavement design methods adopted from the 1993 aashto guide for design of pavement structures aashto 1993. Development of a specification for porous asphalt pavements. Porous pavement operation and maintenance protocol general maintenance the primary goal of porous pavement maintenance is to prevent the pavement surface andor the underlying infiltration bed from being clogged with fine sediments. Design and construction of a pervious concrete pavement.