This parking lot expansion for a medical facility provided 102 additional parking spaces and utilized more than 26,000 square feet of permeable brick pavers constructed over base and drainage aggregates. A coarse filter aggregate recharge bed facilitates rate control and water quality treatment. When needed, buried perforated pipe below the parking lot supplements the storage volume to match post- development run-off rates to pre-development rates.
Unique Challenges
To provide the required parking spaces meant that portions of the existing storm water ponds (which were located adjacent to wetlands) were mitigated
Increasing the impervious surface at the site necessitated additional storm water treatment complied with the requirements of the City and Watershed District
It was important to coordinate the efforts of multiple subcontractors with limited construction staging while keeping the facility operational
Solution
Permeable concrete pavers were selected to address the storm water treatment and reduce the amount of impervious surface at the site. The permeable pavers provided the most aesthetically pleasing, environmentally friendly, and maintenance friendly design. This system also allowed for two existing storm water ponds to be displaced. Larson designed the new permeable paver parking areas to provide treatment of the storm water not only for the new parking areas, but much of the existing impervious pavement areas at the site. Many of the space issues during construction were resolved by establishing small staging areas and working with neighboring sites to provide temporary employee parking while keeping the client current with the general contractor’s schedule.
