"They're working incredibly well," Kevin Osburn, RLA, ASLA, says of the planters and gardens.
"Some have been in place since 2007.
We started construction in 2006 and finished in 2012.
Osburn, a principal with Rundell Ernstberger Associates, also designed this project.
We never wanted them to be deeper than 30 inches so that we had to leave guard rails around the planters," explains Osburn
The stormwater planters contain beehive overflow structures to send overflow during heavy rains to the sewer system, but they're designed to capture 99% of rain events.
They do not have underdrains.
"The soils and subsoils here are very sandy and gravelly," says Osburn
"We're blessed that we have that kind of soil medium to work with."
notes, "Collecting runoff from the streets into the public right of way-that whole concept was new to the city.