Ijethi yamanzi iwuhlobo lokusebenzisa umshini wokusika amanzi anomfutho ophakeme, iyingxenye yesigaba sokusika, inenzuzo efana nesakhiwo esihlangene, ayikho inhlansi futhi ingakhiqizi ukuguquguquka okushisayo noma umphumela wokushisa. Umshini wokusika ijethi wamanzi omfutho ophezulu uyithuluzi elisetshenziselwa ukusika insimbi nezinye izinto usebenzisa i-jet yamanzi ngesivinini esikhulu nokucindezela. Ehambisana nomsindo ophansi, akukho ukungcola, ukunemba okuphezulu nokuthembeka okuphezulu, umshini wethu wokusika indiza yamanzi usetshenziselwe izinhlelo zokusebenza ezihlukahlukene, okuhlanganisa izimayini, ukukhiqizwa kwezimoto, ukukhiqizwa kwephepha, ukudla, ubuciko kanye nezakhiwo.