OR: Portland: Glencoe Elementary School Rain Garden

Sustainable Stormwater Management Program, Portland Bureau of Environmental Services; Feb. 6, 2007. 1 Drainfield Weir Drainfield Inlet Pipe Beehive Overflow Forebay Weir Forebay Design Report Rain Garden at Glencoe Elementary School SE 51st and Morrison... More

Sustainable Stormwater Management Program, Portland Bureau of Environmental Services; Feb. 6, 2007. 1 Drainfield Weir Drainfield Inlet Pipe Beehive Overflow Forebay Weir Forebay Design Report Rain Garden at Glencoe Elementary School SE 51st and Morrison Overview Catchment Area. The catchment area includes Morrison Street and SE 51st Avenue (about 25,000 ft2 of asphalt) as well as the swale for the school parking lot - in large storms the 10,000 ft2 parking lot sends some drainage to the facility2 . About 1,000 ft2 of the school driveway also contributes runoff. Overall Facility Contour. The bottom of the rain garden is flat (similar to a planter) throughout the facility. The planted edges have 4:1 slopes. Forebay. Runoff from the street and overflow from the parking lot swale enter the forebay through a 12” pipe. The forebay footprint is 550 ft2 . A weir controls the depth of ponding; runoff passes into the main compartment when ponding reaches a depth of 2 inches. Main Com Less