Eq. (32) becomes,
                             
                   or,      
                   or,          =   constant        --------------------- (33)

Eq. (33) is called Bernoullis equation for steady, incompressible, non-viscous, irrotational fluid flow. If the velocities , the Bernoullis equation reduces to,

                                 ---------------------------------- (34)

It is basically a pressure and depth relationship.