//Example 5-2 Discharge of Water from a Tank
h_0 = 1.2 //initial height of water level in tank [m]
D_tank = 0.9 //diameter of tank [m]
D_jet = 13 //diameter of tank [mm]
h_2 = 0.6 //final height of water level in tank [m]
g = 9.807 //gravitational acceleration [m/s^2]