It relates the vector area element (a vector normal to the surface) with the normal force acting on it.
This is the same speed the water (or anything else) would have if freely falling the same vertical distance h.

Kinematic pressure
P
        =
        p
        
          /
        
        
          ρ
          
            0
          
        
      
    
    {\displaystyle P=p/\rho _{0}}
  is the kinematic pressure, where 
  
    
      
        p
      
    
    {\displaystyle p}
   is the pressure and 
  
    
      
        
          ρ
          
            0
          
        
      
    
    {\displaystyle \rho _{0}}
   constant mass density.