The National Academies Press

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From page 28... ... 28 4.1 Overview The design of permeable pavements must take into consideration both hydrologic and structural requirements, as discussed in the following sections. In roadway systems subjected to vehicular loading, structural pavement design is typically more than adequate for the layer thicknesses determined in hydrologic design. Read the entire page →
From page 29... ... Design Considerations 29 • Subgrade infiltration – water that exits the subbase of a permeable pavement system and enters the soil subgrade. • Underdrain outflow – water exiting via underdrains. Read the entire page →
From page 30... ... 30 Guidance for Usage of Permeable Pavement at Airports To meet stormwater management goals, permeable pavement systems should be designed to encourage the processes of filtration, detention, and subgrade infiltration to reduce peak runoff rates, improve water quality, and promote groundwater recharge. Systems can be designed to infiltrate all stormwater (full-infiltration or retention) Read the entire page →
From page 31... ... Design Considerations 31 4.2.2 Design Storm and Rainfall Rainfall events, along with watershed characteristics, determine the runoff flows upon which permeable pavement design is based. Different sizes of storms, classified by their return intervals, will have different rainfall characteristics, and therefore runoff flows (Leming et al. Read the entire page →
From page 32... ... 32 Guidance for Usage of permeable pavement at airports of sediments and contaminants. Surface run-on from adjacent surfaces should not be allowed if the area is under construction, contains unstable soils, is used for snow storage, or contains mulch or leaf debris from landscaping (ASCE 2015) Read the entire page →
From page 33... ... Design Considerations 33 construction and the resultant reduction in the infiltration rate are considered in the design process. A higher safety factor may be appropriate for sites where samples show highly variable infiltration rates (ASCE 2015) Read the entire page →
From page 34... ... 34 Guidance for Usage of permeable pavement at airports underdrain. A perforated underdrain pipe may also be required for sites where stormwater infiltration into underlying soil is limited or prohibited, such as those with high groundwater elevations, with shallow bedrock, or where natural soils are contaminated or have low permeability (ASCE 2015) Read the entire page →
From page 35... ... Design Considerations 35 (ASCE 2015) Read the entire page →
From page 36... ... 36 Guidance for Usage of permeable pavement at airports Figure 14. Difference in storage capacity for permeable pavement designs on flat versus sloped surfaces. Read the entire page →
From page 37... ... Design Considerations 37 The net storage of a permeable pavement system is dynamic and should include the amount of water that leaves the system during a storm through infiltration into the subgrade. Storage in permeable pavement is a function of the surface run-on and precipitation rates, available void space, depth of the base/subbase materials, any runoff that has accumulated from previous rainfall, the subgrade infiltration rate, and discharge through underdrain pipes and overflows (ASCE 2015) Read the entire page →
From page 38... ... 38 Guidance for Usage of permeable pavement at airports the performance of permeable pavement within a watershed (ASCE 2015) Read the entire page →
From page 39... ... Design Considerations 39 course be lined with an impermeable liner or barrier to prevent stormwater from entering the subbase of the conventional pavement. It is recommended that a detail be prepared to specify the construction process at the pavement intersection between two pavement types. Read the entire page →
From page 40... ... 40 Guidance for Usage of permeable pavement at airports The American Concrete Pavement Association (ACPA) has developed combination software (PerviousPave) Read the entire page →
From page 41... ... Design Considerations 41 pavements may be different. FAARFIELD performance models are also based on observed performance of conventional pavements, which may not be accurate for permeable pavement materials. Read the entire page →
From page 42... ... 42 Guidance for Usage of permeable pavement at airports For vehicular design, state highway agencies and AASHTO have established required values for inputs depending on anticipated vehicular traffic. FAA AC 150/5100-13A, Method B, provides guidance and inputs for the use of the AASHTO 1993 thickness design method. Read the entire page →
From page 43... ... Design Considerations 43 4.3.4 Paving Layer Properties 4.3.4.1 Base/Subbase Reservoir Aggregate The reservoir aggregate is an open-graded or uniform aggregate with high permeability properties. The high permeability of the layer results in a lower layer modulus (and structural number) Read the entire page →
From page 44... ... 44 Guidance for Usage of permeable pavement at airports For this correlation and these temperatures, the ATPB modulus ranges from 204,000 to 439,000 psi. A modulus of 750,000 psi is recommended for CTPB in reference materials (Masada et al. Read the entire page →

From page 28...

... 28 4.1 Overview The design of permeable pavements must take into consideration both hydrologic and structural requirements, as discussed in the following sections. In roadway systems subjected to vehicular loading, structural pavement design is typically more than adequate for the layer thicknesses determined in hydrologic design.