The volume of water is 80 * 30 * 20 = 48,000 cubic centimeters.

Stand up and place, with the width and height as the bottom, and the bottom area is 30*30=900 (cubic centimeter).

Divide the volume by the bottom area, and the height is 48,000/900 = 65,438+060/3 (cm) ... You can make your own reservation.