Door size 1.5 x 2.0 kan sq m. River channel that separates one side door reserved 3.0 m high, while the water level as the water doors that get purposely water pressure compressed.
Doors water separator 1.5.x 2.0 square meters the river, which is the only hotel door. As the water level is 3.0 meters below the water, find the door that much water pressure.
Door size 1.5.x 2.0 Gan water meters. Blocking the river which is the book the channel door while high water level 3.0 meters, as shown in the picture, and find out the door blocking water pressure to afford.