It is conventional wisdom that in areas where the groundwater is close to the land surface, swimming pools should not be completely emptied. The dimensions of a swimming pool are 10 m long by 5 m wide...

It is conventional wisdom that in areas where the groundwater is close to the land surface, swimming pools should not be completely emptied. The dimensions of a swimming pool are 10 m long by 5 m wide by 2.5 m deep, the weight of the pool is 500 kN, and the groundwater is 1.25 m below the top of the pool. Determine the minimum depth of water that must be maintained in the pool. (Hint: The net force on the pool structure must remain downward.)