The head in a vessel with vertical sides and a height of 4m at the instant of opening an orifice was 3m and at closing had decreased to 1.5m. Determine the constant head under which on the same time the orifice would discharge the same volume of water. Determine the time to discharge from a head of 3m as it decreased to 1.5m if the diameter of the vessel is 2m and diameter of orifice is 50mm. Assume c = 0.60. Determine the time to empty the container.

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