Isihlungi esizihlanzayo siwuhlobo lwemishini yokuhlanza amanzi esebenzisa isihlungi ukuze sibambe ngokuqondile ukungcola emanzini, sisuse izinto ezimisiwe kanye nezinhlayiya, sinciphise ukungcola, sihlanze ikhwalithi yamanzi, sinciphise ukungcola kwesistimu, amagciwane kanye nolwelwe, ukugqwala, njll. , ukuze kuhlanzwe ikhwalithi yamanzi futhi kuvikelwe umsebenzi ojwayelekile wezinye izinto zokusebenza ohlelweni.Inomsebenzi wokuhlunga amanzi aluhlaza nokuhlanza ngokuzenzakalelayo nokukhipha isici sokuhlunga, futhi uhlelo lokuhlinzeka ngamanzi olungaphazanyiswa lungakwazi ukuqapha isimo sokusebenza sesihlungi, ngezinga eliphezulu lokuzenzekelayo.