Landscape Contractor / Design Build Maintain

APR 2017

LC/DBM provides landscape contractors with Educational, Imaginative and Practical information about their business, their employees, their machines and their projects.

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16 LC DBM Left A brown and beige color palette hearkens back to the Alazan Acequia, an irrigation system from the late 1800s that once occupied the space where the plaza is now. CityLock and Eco-CityLock permeable pavers help meet the project's sustainability goals. Right Beneath the paving of Centro Plaza, a storage tank can hold more than 20,000 gallons of water. Recirculation pumps installed by Gratr Landscapes flow the water back to irrigate the trees, using an estimated 50 to 80 percent less water than traditional irrigation. der the canopied area. A permeable version of the paver, Eco- CityLock was created to support the Centro Plaza underground stormwater recycling initiative, and installed around the trees. Gratr Landscapes overcame difficult weather conditions to install the pavers at Centro Plaza on schedule, in about six months. A major challenge to construction was the heavy spring rains, which occurred while the team was working on the un - derground and paving phases of the project. "We had a lot of rain and we were working in a hole that would fill up with water," said Gil Tapia, director of landscape development at Gratr Landscapes. "We had to pump water out of there. Other than the weather, it was a pretty straightfor- ward project." A gravity-fed underground storage and distribution system captures excessive stormwater that matriculates through the permeable pavers and structural soils in pipes that drain into a chamber, which can hold more than 20,000 gallons of water. A low-pressure, low-cost, low-maintenance and low-flow pump redistributes the stored water to irrigate the surrounding trees. The process is projected to save 50 to 80 percent more water than conventional irrigation. Larry Clark, Vice President of Bender Wells Clark Design, directed the design of the hardscape and complex water conservation system, the structural soils that provide a healthy root zone, and the tree bosque. "It was a chal - lenge to find a unified paver that would cover the entire plaza, allowing rainwater to pass through in some areas and not in oth - ers. The manufacturer worked with us to develop a paver system that served both conditions. One paver lets water seep into the structural soils and sand layers below, while the other is a more conventional concrete paver, but they look alike," said Clark. Centro Plaza is the first of three phases in a master plan to provide public transportation from downtown San Antonio to downtown Austin via commuter rail. It includes illuminated ter - minal, historic building renovation, a tower, an open landscape area, two semi-circle canopies, and a Primo canopy. "The plaza and tower illumination is definitely one of a kind with almost every element of the project being illuminated. The sophisticated wireless lighting system allows the plaza to change colors based on an astronomical clock and to communicate with the surrounding illuminated buildings, such as the Children's Hospital," according to Mauricio Ramos, EIT, project manager. LC DBM (Continued from page 14)

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