The City of Lakewood owns and operates sixteen municipal parking lots. CT Consultants provided assistance to the City for the application and implementation of this demonstration green parking lot project funded through Ohio EPA 2012 Surface Water Improvement Grant funds. The initial improvement project focused on Municipal Lots #1 and #4 located adjacent to one another in Lakewood’s downtown which is comprised of storefront businesses that co-exist alongside two small-scale strip malls and several large office-space anchor buildings. The Downtown District abuts residential neighborhoods with an estimated 14,000 people living within a half-mile radius.
Lot #1 is a 134-space, 4,600 square yard parking lot and Lot #4 is a 97-space, 3,177 square-yard lot each located to the rear of several storefront retail properties. Lot #1 was comprised of asphalt with two concrete islands that span the length of each parking row and Lot #4 was also an asphalt lot with guard rails spanning the length of each row. Stormwater runoff from both lots drain directly to catch basins.
The Green Parking Lot Project enables the infiltration of storm water into the ground by replacing portions of the impervious asphalt with pervious pavers. This was accomplished by replacing the concrete islands in Lot #1 with 20-wide strips of permeable pavers (935 square yards). Lot #4 replaced the center guard rail with a 20-wide strip of permeable paves and the installation of a 10-foot wide strip along the lot’s northern perimeter (650 square yards). Trees were installed in each section of permeable pavement which provides for reduction of pavement temperatures through shade and also absorbs groundwater. Two bio-retention areas were also installed in each parking lot in the Northern corners totaling 490 square feet in Lot #1 and 360 square feet in Lot #4. Openings cut into the curb allow storm water to enter each bio-retention area which consists of a vegetated depression with modified soil around the catch basin.
This area of Lakewood is located on a former beach ridge consisting of sandy soils, making it ideal for storm water infiltration. The ratio of impervious to pervious surface that green infrastructure measures can accommodate is significantly higher in Lakewood as compared to other communities in the area. Diverting runoff from the storm system into the ground will help reduce flooding and prevent combined sewer overflows as well as reduce the amount of non-point pollutants entering Lake Erie.