Umcengezi wokuwasha ikholomu, Umcengezi wekholomu usebenza ikakhulukazi esikhaleni esincane sendlu yangasese noma izindlu zangasese ezinezinga eliphansi lokusetshenziswa. Ngoba ukwakheka kwekholomu kulula kakhulu, izingxenye zokuhambisa amanzi nazo zingafihlwa kukholamu yomcengezi omkhulu, ukubukeka okuhlanzekile nokucocekile....