A water tower in a chemical plant holds 2000 L of liquid water at 25C, 100 kPa

Question:

A water tower in a chemical plant holds 2000 L of liquid water at 25°C, 100 kPa in a tank on top of a 10-m-tall tower. A pipe leads to the ground level with a tap that can open a 1 cm-diameter hole. Neglect friction and pipe losses and estimate the time it will take to empty the tank. Use the SL model for water.