Bernoulli's equation, expressed in head [m]

         u²₁            u²₂
y₁ + z₁ + —— = y₂ + z₂ + —— + DH_1-2 [m]
         2·g            2·g

y    = Pressure  Head      [m]
z    = Potential Head      [m]

 u²

 —   = Velocity  Head      [m]

2·g
g    = Earths gravity= 9,81[m/s²]

DH_1-2 = Head losses         [m]