At rest pressure, ( p = K_0 \gamma_s h )
(if submerged)
Use frame analysis (simplified corner moment coefficients for rigid frame): Approximate method (AASHTO Table A.4.1-1 for rectangular box culvert): For top slab: box culvert design calculations pdf
: Covers Reinforced Concrete Box Culvert standards and slopes. At rest pressure, ( p = K_0 \gamma_s