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HomeMy WebLinkAboutSupporting Documentation - 09/25/2025 Title: Sanitary Sewer Deep-Bury Calculations Project: College and Trilby – MF Project No.: 3979303 Engineer: ARJ Date: 09/25/2025 1) Soil load at crown γ = 135 pcf and H = 22 ft (PVC DR-26, PS = 115, E′ = 1,000 psi, paved surface so live load ≈ 0). Per Geotech/ Soils γ =115 pcf. 135 pcf for bedding to be conservative 2) Long-term deflection (Modified Iowa) With +0.3 psi: 1.28%. Criterion: ≤ 5% → PASS 3) Constrained buckling At 22 ft cover with γ = 135 pcf, PVC DR-26 (PS=115) and Class I embedment (E′≈1000 psi) easily meets: • Deflection: ~1.27% (≪ 5%) • Buckling SF: ~4.26 (≫ 2.0)