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Wilmette Public Library – Permeable Pavement Parking Lot – Wilmette, IL

Bono Consulting was retained by the Wilmette Library to evaluate a flooding and icing problem in their patron parking lot.  The lot was pitched towards the building to one catch basin that was partially clogged. This caused flooding to come in through the doors, and a severe icing problem in the winter months. 

The library was interested in pursuing a green solution to reduce the total runoff to the Village’s Storm sewers. It was decided to install a permeable pavement parking lot.  Wilmette is a combined sewer municipality so the storm sewer work fell under the jurisdiction of the MWRD which does not typically allow perforated drain tiles from permeable pavement systems to connect to their sewers.  Bono Consulting was able to meet with MWRD and get them to accept the permeable pavement drain tile connection by demonstaring an acceptable separation from the ground water table. This was one of the first permeable pavement systems ever approved by MWRD.