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