The City of Willoughby Hills received an $80,750 Ohio Environmental Protection Agency Surface Water Improvement Fund grant in 2012 to retrofit the Willoughby Hills Community Center parking lot with 4,919 square feet of pervious pavers.  The Community Center and Library is located at 34500 Chardon Road across the street from Willoughby Hills City Hall.  These pavers were installed during September 2013. 

The pervious pavers help to reduce and clean the stormwater traveling over the parking lot after it rains before this water reaches Gully Brook and the Chagrin River.  Water travels through the spaces between the pavers into the stone base below. The water is slowly released through an underdrain to the storm sewer. This underdrain is elevated above the bottom of the stone base which allows a portion of the stormwater to slowly soak into the soil beneath the stone.  Promoting the infiltration of stormwater will reduce the amount of stormwater going into the City’s stormwater system while the stone base and underdrain slow down the water leaving the site. 
Permeable Pavers at the City of  Willoughby Hills Community Center


Underdrain, Stone Layers and  Pavers Installation

This project is also part of CRWP’s National Estuarine Research Reserve Science Collaborative research initiative that is measuring how much of the water traveling through the pervious pavers goes into the ground, how much evaporates, and how much goes into the storm sewer and eventually to Gully Brook.  See project case study here.

Water quality samples are taken from the permeable paver underdrain.  This equipment also measures how much water enters the storm sewer from the permeable pavers.  The sampler pumps water from the catch basin to a jug inside the sampler. 

Technicians take the water that the sampler has collected to a lab to determine the quantity of metals, nutrients, and sediment in the water that was treated by the permeable pavement.  This is compared to the amount of pollutants present in water from the asphalt portion of the parking lot that is not treated by the permeable pavement.

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.