City of Allentown
Designed a concave parking lot island in this 7-acre park along the Lehigh River. The island is an example of a bio-retention area that is designed to store and infiltrate the first flush runoff generated from the parking lot. A mixture of soil and compost was used in the island to support landscape planting and store moisture. In larger storm events a standard inlet that is set 6” above the bottom of the island and 6” below the parking lot will covey the runoff into a conventional stormwater system to prevent flooding.