Kune varidzi vemba vane chivanze chega kana gadheni, kuchengetedza kwezuva nezuva kwemaruva, zvirimwa, uye miriwo zvinosanganisira kudiridza, uye pombi yebindu inozivikanwa sechishandiso chakakosha chegadheni. Nekudaro, ruzhinji rwevashandisi vanosangana nematambudziko akajairwa senge hosi dzakapoteredzwa, kuyerera kwemvura block