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The team behind the water-management system at Hassalo on Eighth will deliver a presentation on their experience at a national green-building conference.

The system at Hassalo on Eighth is the largest of its type in the United States, said Vanessa Keitges, president and CEO of Columbia Green Technologies. The Portland company is responsible for the development’s green roofs.

Keitges will join Wade Lange, vice president and regional manager for developer American Assets Trust; Kyle Andersen, principal at GBD Architects; and Thomas Puttman, president and CEO of Puttman Infrastructure Inc. in Portland, to discuss the project. The group will be featured speakers at Greenbuild, the world’s largest green-building conference, on Nov. 7 in Boston.

Hassalo on Eighth, a massive mixed-use development in Portland’s Lloyd District, in September was named the national LEED Homes project of the year by the U.S. Green Building Council. The development features green roofs, stormwater planters, green streets, rainwater harvesting and on-site wastewater recycling.

Developers and planners are looking for ways to mitigate flooding, Keitges said.

鈥淭he movement across the country is how can cities and developers manage the flooding, because the flooding is causing all the problems,鈥� she said.

Columbia Green Technologies rooftop systems can absorb 80 percent of the stormwater that hits a rooftop, Keitges said. The systems cost $15 to $20 per square foot to install, she said.

American Assets Trust earned a significant reduction in its system development charges 鈥� from an estimated $3 million to just $1.4 million 鈥� for not using the city’s wastewater infrastructure, Keitges said.

Columbia Green Technologies recently installed green roofs at Nike’s campus in Washington County, Portland State University’s business school and a downtown hotel, among other locations.

Hassalo on Eighth, completed in 2015, has 657 apartments in three buildings. As of Sept. 30, units were 93 percent leased with an average monthly rent of $1,671, according to a federal securities filing.