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Node 3 – Orchard Park Rd & Fairfax (48”): Existing Peak Flow measured (wet weather event) = 14.470 cfs (9.352 mgd)* Proposed Apartments Peak Flow (Flattery’s) = 0.065 cfs** Proposed Apartments Peak Flow (1425 OP Road) = 0.046 cfs** Proposed Total Peak Flow = 14.581 cfs Existing Peak Flow measured (overall) = 16.150 cfs (10.438 mgd)* Proposed Apartments Peak Flow (Flattery’s) = 0.065 cfs** Proposed Apartments Peak Flow (1425 OP Road) = 0.046 cfs** Proposed Total Peak Flow = 16.261 cfs Theoretical capacity of existing 48” pipe @ 0.15% = 60.218 cfs Conclusion: The proposed total peak flow is less than the capacity of the 48” pipe, therefore there is sufficient capacity. At no time during the monitoring period did flow depth exceed the pipe diameter at Node 3 of the downstream monitoring points during the rain events monitored. Foot Notes: Downstream capacity node information provided by Town of West Seneca *Converted from measurements in TECSmith report dated 9/15/22 & 4/19/22 ** See Sanitary Sewage Demand Calculations Proposed Apartments 10/3/2022 Page 2 of 2 Page 483 of 849