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ASCE Publishes Committee Report on Permeable Pavements

Permeable Pavements Task Committee

Edited by: Bethany Eisenberg, Leed AP, Kelly Collins Lindow, P.E., and David R. Smith


After more than five years of work, a design guidance manual on Permeable Pavements has been published. It was sponsored by the Low Impact Development Committee of the Urban Water Resources Research Council of the Environmental and Water Resources Institute of ASCE. This up-to-date book from ASCE is a comprehensive guide to permeable pavements for engineers, planners, landscape architects, municipalities, transportation agencies, regulatory agencies, and property owners planning to implement this best management practice for stormwater and urban runoff. A cornerstone for low impact development and sustainable site design, permeable pavements are considered a green infrastructure practice. They offer many environmental benefits, from reduced stormwater runoff and improved water quality to better site design and enhanced safety of paved surfaces.  This book offers a detailed overview of the typical permeable pavement systems and includes fact sheets, checklists, and real life case studies that help you to successfully incorporate this highly effective stormwater management system into your design projects. UNI-GROUP U.S.A.'s technical director, Harald von Langsdorff was a contributor on this project.


Fact sheets are included for porous asphalt, pervious concrete, permeable interlocking concrete pavement, and grid pavement and feature system descriptions, applications, benefits and information on site constraints/concerns.


The guide is available on the ASCE's website in digital format and also is available in a print version. Click here to order your copy.

New ASTM Test for Permeable Interlocking Concrete Pavers

By ASTM International - The ASTM International recently released C1781 Standard Test Method for Surface Infiltration Rate of Permeable Unit Pavement Systems. This test method is specifically designed for assessing the surface infiltration rate of new and in-service permeable interlocking concrete pavements and permeable clay brick pavements. The test method involves timing a slow pour of a known weight of water into a 12 inch diameter pipe fastened to the permeable pavement surface with plumber’s putty. The infiltration rate is easily calculated using a formula in the test method. The test method also provides guidance on how to locate the 12 in. diameter pipe on the unit paving surface to measure infiltration that represents the pattern on the larger pavement area. The test uses similar equipment and methods in ASTM C1701 Standard Test Method for Infiltration Rate of in Place Pervious Concrete. The similarities between C1701 and C1781 make the test results comparable.

“We are seeing more provincial, state and local permeable pavement specifications require surface infiltration tests to accept new permeable pavements and to evaluate their in-service infiltration for determining surface cleaning,” says Craig Walloch, chair of ASTM Subcommittee C15.04 on Research who helped develop the standard. “Now they have a method with specific guidance for testing unit paving with results that can be compared to that from pervious concrete and porous asphalt.” Mr. Walloch further noted that existing guidelines published by stormwater agencies have used C1701 to test surface infiltration of permeable unit paving. While the results from that test method applied to permeable unit pavement are useful, C1781 provides clear guidance on executing the test on these pavements.

To purchase and download C1781 from ASTM, visit The standard retails for $42 and ASTM members receive a 10% discount.

Transportation Funding Bill Deadline Approaching.

By The Hill - Lawmakers are searching for at least $16 billion to prevent a bankruptcy in the Department of Transportation’s Highway Trust Fund that could occur as early as August without congressional action. Sen. Ron Wyden (D-Ore.) said Thursday that everything was on the table as the deadline quickly approaches. 
“We’re pulling out all the stops to find a funding solution to keep the Highway Trust Fund solvent, and [Wednesday’s] bipartisan members meeting to discuss options was a critical step forward,” Wyden said in a statement. “We had a productive discussion regarding both immediate funding options and longer term solutions to support our infrastructure needs,” Wyden continued. “I’ve now asked committee members to come back by early next week with their preferences, so that we can come to a bipartisan agreement by the end of June. As I said in the committee hearing, failure is not an option.”

The Senate Environment and Public Works Committee has approved a six-year, $265 billion bill transportation bill. But the infrastructure panel has left it up to Wyden’s Finance Committee to come up with a way to pay for it.  The traditional funding source for transportation projects is the federal gas tax, which is currently priced at 18.4 cents per gallon. The gas tax has not been increased since 1993 however, and the federal government’s authorization to collect it is set to expire in September without a new transportation bill. 

Read more: Transportation Bill Funding