Ifomula yokuguqula phakathi kwesantya sokuhamba kombhobho kunye nesantya sokuhamba:

Ifomula yokuguqula phakathi kwesantya sokuhamba kombhobho kunye nesantya sokuhamba:
Isantya sokuhamba kwamanzi silingana nendawo enqamlezileyo yombhobho ephindaphindwe ngesantya sokuhamba kwamanzi.
Isantya sokuhamba masibe ngu-Q, ububanzi bangaphakathi bombhobho bube ngu-D, kwaye isantya sokuhamba kolwelo sibe ngu-V. Emva koko u-Q = π(D/2)²×V.
Xa iyunithi ka-Q ingu-m³/h, iyunithi ka-D ngu-m, kwaye iyunithi ka-V ngu-m/s:
Q = π(D/2)²×V×3600 = 2827×D²×V (m³/h).