Bernoulli’s equation, expressed in head [m]

         u21            u22

y+ z+ —— = y+ z+ —— + DH1-2 [m]

         2·g            2·gy    = Pressure  Head      [m]

z    = Potential Head      [m]

 —   = Velocity  Head      [m]

g    = Earths gravity= 9,81[m/s2]

DH1-2 = Head losses         [m]

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