In fluid dynamics, Total Dynamic Head (TDH) is the total equivalent height that a fluid is to be pumped, taking into account friction losses in the pipe.

${\rm h_{total}= \frac{P_2-P_1}{\rho g}}$

TDH = Static Height + Static Lift + Friction Loss

where:
Static Height is the maximum height reached by the pipe after the pump (also known as the 'discharge head').

Static Lift is the height the water will rise before arriving at the pump (also known as the suction head).