Slope(0.75:1 - hard solid soil, 1:1 - soil likely to crack or crumble, 1.5:1 - soft sandy loose soil) Soil Swell(%) Load Calculator! Trench Excavated Volume - SI Units Bottom Width of Trench (m) Depth of Trench (m) Slope(0.75:1- hard solid soil, 1:1 - soil likely to crack...