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Engineers say new subsurface system will cut field runoff; residents say neighborhood flooding remains unaddressed
Summary
Langan Engineering and village reviewers described a ~12,000 cu ft subsurface stormwater system and perimeter/underdrains that modeling shows large runoff reductions (92% in 1‑year storms, 60% in 100‑year events), but neighbors and village reviewers stressed the system won't eliminate downstream flooding and asked for broader mitigation and clarifying calculations.
Langan Engineering described a multi-part stormwater approach for the proposed Bronxville Iona field that includes perimeter drains, underdrains through the playing surface, sand-amended materials for infiltration and a central subsurface storage assemblage the team quantified at roughly 12,000 cubic feet. The project engineer said modeling indicates a reduction in peak runoff leaving the site of about 92% in a 1-year storm, about 80% in a 10-year event and about 60% in a 100-year event compared with current conditions.
Village civil reviewers (KSCJ Consulting) told the board they requested the applicant exceed state minimums because of neighborhood sensitivity; they cautioned that, while the proposed measures would reduce site flows, they would not by themselves resolve longstanding flooding in the Crawford/Saddle area. Residents described repeated short-duration deluges that overwhelm the downstream municipal system within minutes and urged further coordinated mitigation, dye studies and documentation of where and when captured water will be routed and released. "We're showing that we are significantly reducing the runoff from the site," the engineering presenter said; residents countered that the campus-wide runoff, parking-lot flows and upstream surfaces must be addressed in aggregate.
