Ohio EPA awarded Cleveland Metroparks $85,000 through the Ohio EPA SWIF grant program to install a 5,000 square feet bioretention cell and vegetated swales and rain gardens to treat 1.3 acres of the impervious parking lot surface at the North Chagrin Nature Center. The bioretention cells were constructed in Fall 2014 within existing grassed islands in the parking lot. The rain gardens and vegetated swales were placed along the perimeter of the parking lot and drive lane. Headwater stream monitoring data collected by Cleveland Metroparks indicate that runoff from the parking lot may have been negatively impacting receiving streams in the park. However, the use of these infiltration practices will remove pollutants in stormwater runoff and reduce the volume of runoff impacting receiving streams.
  • During rain events, water from a portion of the parking lot flows to the biorention cell. The biorentention cell filters the stormwater and allows it to soak into the ground. The remaining water is slowly released to a perforated pipe that carries the water to a stream that is a headwater to the Chagrin River. 
  • Stormwater runoff from other parts of the parking lot is directed to two rain gardens by vegetated swales, rather than underground pipes.  The special soil mix in the rain gardens treat runoff and allows it to soak into the ground.
This product or publication was financed in part or totally through a grant from the Ohio Environmental Protection Agency under the provisions of the Surface Water Improvement Fund and the USEPA Great Lakes Restoration Initiative.