Definition of pressure head Pressure=P Datum Pressure head at point=Plpg(m) Piezometric head=p/ g +y (m) Piezometric pressure =P+pgy h In fluid statics, gauge pressure head at depth h below free surface Lpg=pgh/pg-hDefinition of Pressure Head Pressure head at point = P/ g (m) Piezometric head = P/ g + y (m) Piezometric pressure = P +  g y In fluid statics, gauge pressure head at depth h below free surface = P/ g =  g h /  g = h Datum Pressure = P y  h