Hazen-Williams friction loss
Head loss along a pipe run. Useful for sizing borehole risers, pressure mains and irrigation manifolds.
Head loss
2.17m H₂O
= 7.1 ft H₂O
≈ 2.17 m per 100 m (over 100 m total)
Pressure loss
0.212bar
= 21.2 kPa·3.08 psi
Velocity
1.02m/s
= 3.34 ft/s
Within the recommended 0.6–2.5 m/s range.