Hunhu hwenyika dzinodzikisira ndeyekuti manhamba avo epamhepo anoenderana, ndiko kuti, nzvimbo dzemisangano mikuru nemisoro midiki iri pamutsetse wakaenzana. Dhizaini iyi inobvumira kuyerera kutungamira kwemvura kuti irambe isinganyanye kusachinjika kana ichipfuura nekudzora, kuderedza kuramba kunokonzerwa nekuchinja kunoyerera.
