Total Discharge Head

Total discharge head. abbreviated as \(h_d\), also called total head or total dynamic head, is used in fluid mechanics and hydraulic engineering to describe the total energy per unit weight of fluid at any point in a hydraulic system.  It represents the sum of different components of head, each contributing to the total energy of the fluid.

 

Total Discharge Head Formula
\( h_d  =  h_{sd} + h_{pd} + h_{fd}   \)     (Total Discharge Head) \( h_{sd}  =  h_{d} - h_{pd} - h_{fd}   \) \( h_{pd}  =  h_{d} - h_{sd} - h_{fd}   \) \( h_{fd}  =  h_{d} - h_{sd} - h_{pd}   \)
Symbol	English	Metric
\( h_d \) = total discharge head	\(ft\)	\(m\)
\( h_{sd} \) = static discharge head	\(ft\)	\(m\)
\( h_{pd} \) = surface discharge pressure	\(lbf\;/\;in^2\)	\(Pa\)
\( h_{fd} \) = friction discharge head	\(ft\)	\(m\)