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through a 48 inch outlet pipe that connects to the existing storm sewer outlet system and ultimately discharges to Cazenovia Creek. The stormwater management facilities have been designed to satisfy the requirements of both the Town of West Seneca and the NYSDEC. The overall stormwater management system, including water quality treatment and peak flow control, has been designed in accordance with Chapters 4 and 9 of the NYSDEC Stormwater Management Design Manual. Wet Pond Summary: Top of basin elevation = 614.50 Permanent pool elevation = 607.80 Bottom of basin elevation = 601.80 100-year storm storage volume = 283,293 cf @ 612.22 Water Quality Summary: WQv req’d = 46,210 cf (1.061 ac-ft) RRv min. req’d = 0 cf (0 ac-ft) WQv provided – Wet Pond = 46,210 cf (1.061 ac-ft) WQv provided – 46,210 cf = WQv provided = 46,210 cf Note: Since the proposed redevelopment results in a net decrease in impervious area, no Runoff Reduction Volume (RRv) is required. All new impervious surfaces associated with the project are classified as disturbed impervious areas. The proposed wet pond has been designed to provide stormwater treatment for the ultimate full buildout condition of the site. Total Runoff Summary: Event Ex. Runoff (cfs) Pro. Runoff (cfs) Result (cfs) 1-year 103.89 38.71 -65.18 10-year 184.66 87.97 -96.69 25-year 229.09 109.83 -119.26 100-year 317.14 141.36 -175.78 West Seneca Exchange 07/20/2026 3 of 3 Page 676 of 1174