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Gahanna committee advances Academy Park detention-waiver request after technical debate over runoff modeling
Summary
Council heard a planning commission request to waive parts of the city’s critical-storm detention standard for the Academy Park project. Staff said modeling with the proposed retention pond shows site hydraulics nearly unchanged; some council members asked for more detail on a modeled 1% change and downstream erosion before final adoption is scheduled.
Gahanna’s Committee of the Whole considered a request from planning commission engineering to waive certain local detention requirements for the Academy Park redevelopment, a project abutting the Big Walnut Creek.
Holly Boyer, speaking for engineering and the planning commission, said the project would remove an existing building and add an ADA-accessible facility, playgrounds, concession amenities, expanded parking, trails and sidewalks. She told council the design includes a retention pond required by the construction general permit and that the project team is asking for a waiver of Gahanna’s additional critical-storm storage standard in Code section 113.02(e).
“Staff has no objection because the analysis shows that the site hydraulics are relatively unchanged,” Boyer said, summarizing the project team’s hydrologic modeling. Boyer explained that, in the project’s raw (no-control) scenario, the site would show an 85% increase in runoff; after adding the water-quality volume and the proposed retention pond, the model indicates roughly a 1% net change compared with predevelopment hydraulics.
Supporters who spoke during the discussion said the hydrology report and planned tree plantings should improve water quality and habitat along Big Walnut Creek, which one commenter described as a warm-water habitat and an Ohio-designated scenic river. Several council members, however, pressed staff on whether even a sub-1% modeled difference could exacerbate local erosion or localized flooding downstream.
Council and staff agreed to advance the proposal to second reading next week and scheduled final adoption for the 16th (to be considered on the regular agenda) so outstanding technical questions can be resolved before a vote. The administration emphasized that the project will comply with the state construction general permit and that future additions that exceed the project’s original limits would require reapplication for any waiver.
What’s next: The committee placed the waiver on the regular agenda for the upcoming meeting to allow council and staff to address remaining hydrology questions before formal adoption on the calendared 16th.
