• Jun 5, 2026 box culvert wingwall design example 5774}{1.4226} \approx 0.406 \) Lateral earth pressure (P): \( P = K_0 \times \text{soil unit weight} \times \text{depth} \) Assuming a soil unit weight (\( \gamma \)) of 18 kN/m³, and a depth of 3 meters: \( P = 0.406 \t By Charlotte Bahringer
