180 York Street35 Cambridge Park Drive3rd StreetArgyle StreetAthletic & Recreation CenterAurora Police StationBentley University ArenaBerry LaneBrooklyn Naval YardsBuckingham FountainCasa QueretaroChurch Street ParkingCity Field Met StadiumCleveland Clinic parking lotDunbar ParkEast Liberty Presbyterian ChurchEaston Gateway parking lotEvanston Fountain SquareFrancis Street Parking LotFranklin D. Roosevelt State ParkFulton Pocket ParkGarden City CenterGlen Ellyn METRA Parking LotGoldring Student CenterGrafton LumberyardGrand Traverse Fire StationGrove StreetHarrison PATH StationHoboken Southwest ParkHudson Sponge Connection, West SideJaycees ParkLC New AlbanyLiberty Village ParketteLillian ParkLoyola University St. Ignatius Community PlazaLoyola University West QuadMary Bartelme ParkMcDonald’s Chicago FlagshipMilwaukee DomesMonona Permeable Parking lotMorton ArboretumMount Lebanon High SchoolNavy PierNew Trier High SchoolNew York Botanical GardenNorth Union Streetscape in OleanNorthwestern Lake Forest HospitalOffice Building Parking LotOrozco AcademyParmer Research Triangle ParkParvis du parc Frédéric-BackPearl Street StreetscapePlaza de las AmericasPort of RochesterPrairie District ParkRadio FlyerRhode Island Public Transit AuthorityRiggs Heritage ParkRiverside Green Parking LotServiam Gardens Senior ApartmentStonehill CollegeSUNY Cortland Tennis CourtsSutton Place ParkThe BeverlyThe Post at 200 SmithThe Weston Hotel/Delaware NorthTinkham Veale University Centre, Case Western Reserve UniversityTown of WilliamsvilleTriton College StadiumUnited Nations HeadquartersUniversity of MichiganUptown Alleyway & MOCAUSS Constitution Overlook ParkValley Lo Country ClubVillage GreenWaubonsee Community CollegeWest Union Green StreetsWhole Foods – Springbrook Shopping CenterWilliam M. Meredith SchoolYolanda Garcia Park

Morton Arboretum

Morton Arboretum

The Morton Arboretum

Lisle, Illinois

The Morton Arboretum replaced a former degraded retention pond and asphalt parking lot with a functioning wetland system and permeable parking lot. The project was the beginning of a 20-year capital improvement master plan, aimed at expanding facilities and sites to demonstrate sustainable design to visitors. All 850,000 annual visitors to the Arboretum pass through the high performance Unilock parking area to reach the Visitor Center. The permeable parking lot, the largest of its kind in the Midwest when it was installed, infiltrates and collects rainwater through a subsurface gravel bed, channels water through bioswales, and directs overflow through to a final cleansing via the wetland area within the restored lake system. The complete project site is certified by the Sustainable SITES Initiative.

When it was installed in 2004, the permeable pavement system had a higher upfront installation cost of $42 per sq yd, compared to $17 per sq yd for asphalt. However, the real costs of both systems accumulate with maintenance: Over a 50-year period, maintenance costs for an interlocking permeable concrete paver system are projected to be $45 per sq yd, compared to $80 per sq yd for asphalt. Based on these forecasted annual costs, year 23 is projected as the break-even point for the permeable pavement system.

Full Case Study from the Landscape Architecture Foundation.