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CARMINA WOOD DESIGN Project No.: 23-4121 Date: 5/22/2026 80 Silo City Row, Suite 100 Project Name: Multifamily Development Buffalo, New York 14203 Project Address: 1425-1475 Orchard Park Road - West Seneca (716) 842-3165 Subject: Water Demand Calcs FAX (716) 842-0263 Sheet: 1 of 1 Water Demand Calculations (domestic): Townhome Development: Q = 3 gpm/unit x 29 units = 87 gpm ECDOH Requirement Water Demand Calculations (fire): Q= 1500 gpm * per ISO Guidelines Elev. at ex. residual hydrant = 684.5 ft Static pressure at ex. hydrant = 70 psi El. @ road tap = 684.5 ft Δ elev ex. hydrant to road tap = 0 ft = 0.0 psi (positive is decrease in pressure from static) (negative is increase in pressure from static) Static pressure at road tap = 70.0 psi El. @ furthest building = 679.9 ft Δ elev road tap to furthest building = -4.6 ft = -2.0 psi (positive is decrease in pressure from static) (negative is increase in pressure from static) Find residual at furthest unit using domestic flow: Headlosses: Qpeak = 87.0 gpm Pipe = 6 inch PVC C = 150 Length = 646 LF (approx. distance from tap to furthest building) 10.44 L Q1.85 10.44(646)(87)1.85 HL = 1.85 4.866 = = 0.40 ft = 0.2 psi C D (150)1.85 (6)4.866 Loss through 6-inch RPZ & meter = 13 psi Residual pressure at furthest unit = Static pressure at road tap - headlosses - Δ elev =70.0 - 0.2 - 13 - (-2) = 58.8 psi Find residual at furthest hydrant using fire flow: Headlosses: Qpeak = 1000 gpm Pipe = 6 inch PVC C = 150 Length = 509 LF (approx. distance from tap to furthest hydrant) 10.44 L Q1.85 10.44(509)(1000) 1.85 HL = 1.85 4.866 = 1.85 4.866 = 29.05 ft = 12.6 psi C D (150) (6) Loss through 6-inch RPZ = 13 psi Residual pressure at furthest unit = Static pressure at road tap - headloss - Δ elev = 70.0 - 12.6 - 13 - (-2) = 46.4 psi Page 477 of 849