Hydraulic Engineering Glossary

Definitions of the terms working hydraulic engineers use every day — TDH, NPSHa, BEP, Hazen-Williams, Reynolds number, and more.

TDH (Total Dynamic Head) Static Head Friction Loss NPSHa (Net Positive Suction Head Available) Cavitation BEP (Best Efficiency Point) POR (Preferred Operating Region) AOR (Allowable Operating Region) Hazen-Williams Equation Darcy-Weisbach Equation Moody Chart Reynolds Number Vapor Pressure