city of wolfforth, tx, has a water tower near frenship high school and is planning to construct another water tower due to increasing population. the new water tower will be 15 m (50 ft) high to provide enough water pressure to all buildings near the area of the tower. shallow foundation was used for the existing water tower, but a drilled shaft is considered as a foundation option for the new water tower because of subsurface conditions. according to site investigation program, the soil profile at the project site consists of a soft clay with su