Landscape Architect & Specifier News

MAR 2017

LASN is a photographically oriented, professional journal featuring topics of concern and state-of-the-art projects designed or influenced by registered Landscape Architects.

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Continued from page 12 h a rd s c a p e s 14 Landscape Architect and Specifier News reddish orange and charcoal pavers so driving lanes, pedestrian crossings and other required roadway markings are permanent and do not require restriping. According to Randy Hays, CEO of European Paver Designs, the two-phase installation approach allowed for some give-and-take with the location of the stripes to accommodate last minute shifts in alignment. The expert installation, which featured quarter-inch joint and interlocking spacer bars, created an extremely smooth surface for bicyclists and skateboarders to safely enjoy. "The permeable paver surface is likely safer for cyclists to traverse in wet conditions because it prevents standing water," said Don Irby, P.E., supervising civil engineer with the Berkeley Public Works Department. An initial stormwater monitoring report found that Allston Way reduced 94 percent of runoff during a storm that produced 1.75" of rain over a 19-hour period. The success of the project helps validate the value of PICP systems for municipalities and offers a blueprint for renewing streets with tangible long-term cost, maintenance and environmental benefits. "Berkeley is really committed to the environmental aspects of construction," said Hays. "Sustainability in the construction industry, especially with regard to water conservation, is very important. Building streets that actually return water to an underground system is a pretty cool thing." Top, Right: As a contrast to the red and charcoal pavers, custom colored yellow and white pavers designate crosswalks and driving lanes. Since the color is permanent (not painted on), this section of road will never require restriping. Above: The 'Eco-Priora' pavers can generate average permeability flow rates of 100 inches per hour, according to Pavestone. While California will probably never see that strong of a storm, the 1.75 inches that fell within 19 hours not long after the roadway was complete had runoff reduced by 94 percent. Bottom, Right: The design team specified these permeable interlocking concrete pavers to be installed over a layer of high-density polyethylene cells filled with aggregate. The placement of these cells reduced the necessary excavation depth by a foot, and prevented the installation from disrupting existing underground utilities and root systems from street trees. Team List AECOM – Design Applied Research Associates, Inc. – Design City of Berkeley Public Works Department – Civil Engineering European Paver Designs – Installation

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