The project is designed to address the 10 - year, 1 hour rainstorm, which is 1. Due to this, sequential storms take up capacity in the system. The system releases runoff slowly, so as not to cause issues downstream. Larger storms will over - run the system and flooding will occur. In finishing the RMS project, by connecting the runoff from South Wayne and Lancaster Avenues to the RMS system, another 350, 000 gallons of underground storage is now utilized. The storm water management project is two pronged including the underground parking lot storage and the use of the underutilized storage of the RMS system. Based on the elevations of the street and pipes, the maximum amount of storage is constructed underneath the parking lot and, when empty, can hold approximately 253, 000 gallons runoff. The project design utilizes underground stormwater storage beneath the South Wayne Municipal Parking Lot. 9” of rain in a one - hour period ) is the most frequent and impactful to the community. Meliora Design, the Township’s stormwater infrastructure design consultant, determined that the 10 - year, 1 hour rain event ( i. Despite being small in acreage, the Township owned municipal parking lot on South Wayne Avenue proved to be the best ground in the area for the project as well as the only open space in the otherwise densely populated neighborhood. To help provide incremental relief to the area, the Township approved the installation of a South Wayne storm water management system. Acres and acres of impervious surface, much constructed at the turn of the century, as well as the topography of the area, contribute to the flooding. The South Wayne neighborhood, near the Radnor Fire Company ( RFC ) and Radnor Middle School ( RMS ) on South Wayne and Runnymede Avenues, has experienced flooding for decades.
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