A curving concrete path leads visitors through a quarter-mile loop around the perimeter of the green roof, allowing for easy navigation.A constructed wetland at the east end of the park was designed to collect greywater from the restrooms within the transit center and to treat it for re-use in toilets and urinals in terminal restrooms.In order to create a topography that blurs the distinction between roof and ground, the park integrates mounded vegetated hills with domed architectural skylights that allow daylight into the terminal below.Geosynthetic fill was used to build up the rolling topography of the park while adding minimal weight to the structure. This layered planting system is a structurally engineered component of the building that functions to balance seismic shifting, collect and filter stormwater, and irrigate the gardens. The 5.4-acre green roof has soil depths that vary from 18 inches to 4.5 ft.
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