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North Wayne Park Detention Basic Proposal

Radnor Township is proposing to construction a new detention basin in North Wayne Park, Radnor Township, PA as a solution to downstream flooding.  

According public statements and documents, construction of a new detention system at the Park will provide only “incremental” improvements/benefits for flooding and water quality protection.; it is unclear what is meant by “incremental improvement”. The level of reduction in actual flood damages, and the kind of damages that will be reduced, including to what degree, has not been provided. The project being proposed would require at least “partial waivers from infiltration, water quality and stream bank erosion permit requirements.” The proposal includes providing fencing around portions of the park and would necessitate movement of park play and field amenities.

Basic Background: 

    The North Wayne Park is part of the Gulph Creek watershed. Gulph Creek is a tributary to the Schuylkill River which is a tributary to the Delaware River. 
    At Poplar Avenue, the drainage area to the North Wayne Park is approximately 8% of the Gulph Creek Watershed. Only water from that area would be controlled by this feature. (Total drainage area to North Wayne Park is approximately 600 acres. The area that drains to the park is 46.58 acres.) 
    The design engineer for the detention basin proposal has stated that the proposal should be considered only an “incremental improvement” for flooding issues. (3/28/14 Project Summary & 5/6/2014 powerpoint) 
    The North Wayne Park is owned by the Radnor Township School District. 
    The North Wayne Park is open for public use and is enjoyed by residents and organized sports throughout the year. 
    The School District Facilities Committee was only approached about the proposed project on May 6th, after the Township invested significant resources in developing project plans. 
    There currently exists a detention system at the North Wayne Park. 
    The 5 solutions considered by CVE were all focused on a detention system at the North Wayne Field and according to a 5/6/2014 power point “Due to space limitation none of the options can meet current water quality regulations and will require partial waivers from infiltration, water quality and stream bank erosion permit requirements.” 
    Projects at the AT&T site, at an auxiliary parking area, a series of mini systems distributed, bioretention at the southerly parking lot, potential work at the church of the savior were given some level of consideration but are not part of the proposed solution. 
    A more comprehensive solution including stream restoration, proposed wetlands, structural buyouts was noted on a 5/6/2014 powerpoint with no information on incremental costs and benefits for partial implementation to take place over time, only a total cost of $58 mil suggested.

Supporting Documents