Physics problem, please help, thanks a lot?

9.) A swimming pool 10m deep empties through a hose at the bottom. The density of water is 1000 kg/m3. Atmospheric pressure is 1.01300 x 105Pa. If the hose is shut off, find the Pressure that builds up at the shut off valve. If the valve is open, find the speed that the water escapes. ume that the top surface hardly moves.