Ukubaluleka kweevalvu kuyilo lwemibhobho yobuchwephesha bokuhambisa amanzi ngombhobho
Ukubaluleka kweevalvu kuyilo lwemibhobho yobuchwephesha bokugqithiselwa kwamanzi kwimibhobho kwiinkqubo zemibhobho yolwelo, iivalvu zizinto zolawulo ezindima yazo iphambili ikukwahlula izixhobo kunye neenkqubo zombhobho, ukulawula ukuhamba, ukuthintela ukubuya umva, ukulawula nokukhupha uxinzelelo. Yiba...
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