A simply supported beam of span 'L' and uniform flexural rigidly EI, carries a central load 'W' and total uniformly distributed load 'W' throughout the span. The maximum deflection is given by

Given that the density of earth is ω, the angle of repose is φ and h is the height of the wall and the earth retained is level, the active earth Pressure 'P' on retaining wall is given by