Isetshenziselwa ukuhlola, ukuhlola kanye nokukala ukusebenza kokudlulisa okuguquguqukayo kwendwangu emanzini awuketshezi. Isekelwe ekuhlonzweni kokumelana namanzi, ukuxoshwa kwamanzi kanye nesici sokumunca amanzi sesakhiwo sendwangu, okuhlanganisa i-geometry nesakhiwo sangaphakathi sendwangu kanye nezici ezikhangayo eziyinhloko zemicu yendwangu kanye nezintambo.
