PICP 5th Edition Manual

Fall 2017

ICPI announces the release of an updated, comprehensive guide to design, construction and maintenance of permeable interlocking concrete pavement (PICP)



PICP 5th Edition Manual

Authored by ICPI’s Technical Director, David R. Smith, the 138-page book emerged from an initial tome published by ICPI in 2000 and subsequently improved over 17 years from PICP research and experience. With over 100 color figures and tables, the manual is for civil engineers, landscape architects, urban planners, contractors, and stormwater and transportation agencies. Those who use it should be familiar with stormwater management concepts and calculation methods.

This fifth edition includes revised subbase thickness design tables developed via full-scale load testing and mechanistic modeling in 2014 by the University of California Pavement Research Center. The revised tables, selected figures and design methods from this manual are also included in the ASCE/ANSI national standard on PICP now in its final stages at this writing and will be announced when available from ASCE. That standard gives more in-depth information on PICP hydrologic and hydraulic design. The ICPI manual presents comprehensive reading on construction and maintenance. The two publications should be read together.

As with the 2011 fourth edition, this 2017 fifth edition is divided into five sections. Section 1 provides an overview on PICP. Section 2 provides criteria for selecting appropriate sites and systems. Section 3 includes basics for sizing storage and selecting base and subbase thicknesses. A design example is presented. Detailed, time-based inflow and outflow calculations can be worked using ICPI’s Permeable Design Pro software or other stormwater models. Such modeling and calculations are for engineers familiar with hydrology and hydraulics, as well as pavement structural design using flexible pavement design concepts articulated by the University of California Pavement Research Center and by the American Association of State Highway and Transportation Officials (AASHTO).

Updated construction methods and guide specifications are included in Section 4. Much has been learned about maintenance, so Section 5 is completely revised. There are construction and maintenance checklists, as well as a model ordinance for use by municipal governments. There is a Glossary of Terms and References at the end that provides a wealth of information beyond the manual.

In the book’s Introduction, the author asserts that while synonyms, the words porous, pervious and permeable differentiate surfacing materials with underlying base configurations, e.g., porous asphalt, pervious concrete and PICP. These terms have been designated by their respective industries. Etymology is instructive. The Latin root for permeable (permeare) means capable of passing something such as air or water.

The Latin root for pervious (pervius) means capable of accepting something such as air, water or even ideas. The Latin root for porous (porus) means full of holes.

When referring to runoff-reducing pavements collectively, all pass water through them, making all permeable. As readers use this fifth edition PICP manual, the author encourages reader to apply PICP within the context of broader site designs and community goals that encompass integrated stormwater management. The book’s introduction notes that besides runoff reduction, PICP likely improves the mental health and well-being of people. The author notes that PICP does this more elegantly than any other pavement: porous, pervious or impervious.

ICPI offers the book in print only for $52.25 plus shipping and handling on www.icpi.org. ICPI members and design professionals can purchase the book for $26 plus shipping and handling.