An underground storage tank with rectangular sections (length = 100 ft, width = 70 ft, height = 10 ft) is used for temporary control of storm runoff. Determine the stage-storage-discharge relationship...

An underground storage tank with rectangular sections (length = 100 ft, width = 70 ft, height = 10 ft) is used for temporary control of storm runoff. Determine the stage-storage-discharge relationship assuming outflow from the tank is controlled by an orifice at the base of the tank. The rectangular orifice has a length of 3 ft and a height of 0.5 ft. The loss coefficient is 0.6.