Mu guhangana n’ibura ry’amazi ku isi, cyane cyane ku nkombe z’inyanja n’ibirwa, kwangiza amazi yo mu nyanja byagaragaye nkikoranabuhanga rikomeye mu gutanga amazi meza, meza. Ibihingwa gakondo byangiza, nubwo bigira akamaro, akenshi bisaba ibikorwa remezo nibikoresho. Ariko, kuza kwa sisitemu yo kwangiza amazi yo mu nyanja byahinduye iyi miterere, itanga uburyo bworoshye, buhendutse, kandi bwangiza ibidukikije.