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ZBA approves patio and retaining wall at 15 Lewis Ave, conditioned on stormwater calculations
Summary
The board approved a variance for additional impervious surface at 15 Lewis Avenue (variance ~211.62 sq ft) after the applicant described pervious pavers, linear drains and a Coltec infiltration system; approval was conditioned on submission of engineering/Coltec calculations to the building department and ZBA.
The Dobbs Ferry Zoning Board of Appeals approved a variance to allow additional impervious coverage for a proposed tiered patio, outdoor kitchen and retaining wall at 15 Lewis Avenue, contingent on submission of engineering documentation.
Marco Mandra, the architect, said the design uses pervious pavers (manufacturer guidance cited at 50% pervious), linear drains and an on‑site Coltec infiltration chamber system to capture runoff. He told the board the building department had been provided the Coltec stormwater calculations designed to the town’s standard for a 100‑year storm; those calculations were not included in the ZBA packet but the board requested they be submitted to the ZBA file as well.
The building inspector’s calculations show proposed impervious coverage of 3,391.5 square feet and a requested variance of approximately 211.62 square feet. Board members pressed whether more pervious materials could eliminate the need for a variance; staff and the applicant explained the town’s current approach gives a 50% credit for pervious paver systems and that an oversized‑lot deduction in the code reduced available impervious credit, producing the variance in this case.
A motion to approve the application was made with the condition that the applicant submit engineering/Coltec calculations and related stormwater documentation to the building department and the ZBA; the board voted to approve the variance with those submittal conditions.
