\( h_t \;=\; \dfrac{ 3960 \cdot WHP }{ Q } \) (Total Head)
\( WHP \;=\; \dfrac{ h_t \cdot Q }{ 3960 } \)
\( Q \;=\; \dfrac{ 3960 \cdot WHP }{ h_t } \)
Total head, abbreviated as \(h_t\), is the sum of the discharge flange and the sum of the suction flange.