10th @ Hoyt Apartments

Designers: Koch Landscape Architecture | City: Portland, OR | Project Type: stormwater management, green roof, courtyard
Date Visited:

Locations: 10th and Hoyt Streets, Pearl District, Portland, OR
Size: 8,500 sq. ft
Cost: $270,000
Official Opening Date: March 2003


Portland is notorious for its rain. Averaging over 36 inches of annual rainfall per year, the City of Portland has mandated that all new and redevelopment projects with over 500 square feet of impervious surface must manage and treat stormwater on site.

The 10th @ Hoyt courtyard was one such project developed under this law. Situated at the heart of the Pearl District, this courtyard is commendable not just for its stormwater treatment capabilities, but for its aesthetic design as well.

“You can do a lot of things to mitigate the impacts of stormwater, but typical and mostly mechanical methods provide no cultural or aesthetic function; the function here is detention and human delight.” – Steve Koch

From a project description:

“The courtyard features a green roof (above the below-grade parking) that captures, conveys, and creatively displays stormwater runoff. Three copper downspouts channel rainwater into detention basins and a cistern in the courtyard. The water is then recirculated across sculptural metal boxes pierced by glass buttons and illuminated by interior lights, creating a playful visual display and a soothing sound for residents.”

The 10th @ Hoyt courtyard has the capacity to detain rainwater for approximately 30 hours and has both assumed and exceeded “the required 20% stormwater mitigation function for the project.”

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