Pump Total Dynamic Head (TDH)
Total dynamic head from static lift, static discharge, and Hazen-Williams suction / discharge / fittings friction, with a pump-curve operating point.
Formula and source
TDH = (static_discharge_head + static_suction_lift) + suction_friction + discharge_friction + fittings_friction. Friction = Hazen-Williams h_f = 4.52*Q^1.852 / (C^1.852 * d^4.87) * L. Pipe velocity v (ft/s) = 0.4085 * GPM / d^2.
Hazen-Williams (1905, public domain); Crane Technical Paper No. 410 (fittings equivalent length).
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