I = (b * h^3) / 12
Next, Alex turned her attention to the structural design of the culvert. She had to ensure that the culvert could support the weight of the soil and the vehicles passing over it. She used the following formula to calculate the moment of inertia of the culvert: box culvert design calculations pdf
where Q was the flow rate, n was the Manning's roughness coefficient, A was the cross-sectional area, R was the hydraulic radius, and S was the slope. I = (b * h^3) / 12 Next,