Sidwell Friends School- erraced wetlands step down the hill of the courtyard as they act as the primary filtration mechanism for building wastewater. Below the surface, dirty water from the kitchen and bathrooms flows through the dirt and sand to remove contaminants. Because the water never breaches the surface, students in the courtyard cannot smell odor nor contact the water directly.
The Sidwell Friends School is a private middle school. This building was awarded the coveted Platinum LEED by the Green Building Council, and it was one of the American Institute of Architect's Top Ten Green Project for 2007. Inside, daylight use is extensive. Photosensors automatically dim or shut off the electric lights when daylight is sufficient, and occupancy sensors ensure that lights are shut off when rooms are unoccupied.