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CARMINA WOOD DESIGN Project No.: 24-4113 Date: 7/13/2026 80 SILO CITY ROW, SUITE 100 Project Name: West Seneca Exchange BUFFALO, NEW YORK, 14203 Project Address: Orchard Park Road West Seneca, NY (716) 842-3165 Subject: Sanitary Sewer & Water Demand Calcs FAX (716) 842-0263 Sheet: 3 of 3 Water Demand Calculations (domestic): Proposed Shopping Center Development 61,228 gpd x 1.1 = 67,350 gpd *use 110% of sewage demand *use 1.8 peaking factor and assume a 12 hour day 67,350 gpm x 1day/12hr x 1hr/60min = 93.54 gpm 93.54 gpm x 1.8 = 168.38 gpm Qpeak Headlosses: Qpeak = 168.38 gpm Pipe = 8 inch Polyethylene C = 140 Length = 50 LF (approx. distance from tap to RPZ) 10.44 L Q1.85 10.44(50)(27.89) 1.85 HL = 1.85 4.866 = = 0.03 ft = 0.01 psi C D (140)1.85 (8)4.866 Δ elev = 0 ft = 0.00 psi Loss through meter = 1 psi Loss through RPZ = 12 psi Total Losses = 13.0 psi Static Pressure = 90 psi (per ECWA) Residual Pressure Following RPZ = 40 - 13.0 = 77.0 psi (available after rpz & meter) Residual Pressure 30" above 2nd Floor Δ elev = 15 ft = 6.50 psi Residual Pressure 30" above 2nd Floor = 70.5 psi * Water Demand Calculations (fire): Proposed Shopping Center Development Q= 1,000 gpd Headlosses: Qpeak = 1168 gpm Pipe = 10 inch C-900 PVC C = 140 Length = 1,300 LF (approx. distance from RPZ to farthest hydrant) 10.44 L Q1.85 10.44(1300)(1168) 1.85 HL = 1.85 4.866 = 1.85 4.866 = 9.36 ft = 4.05 psi C D (140) (8) Δ elev = 4 ft = 1.73 psi Static Pressure after RPZ = 77.0 psi Residual Pressure at hydrant = 77 - 5.8 = 71.2 psi Page 685 of 1174