Kwishishini lokuthumela, iimveliso zokucoca zisetyenziswa ikakhulu kunyango lwamanzi acocekileyo, ukwahlula i-oyile kunye namanzi, unyango lomoya, kunye nokucoca ioyile yenqanawa.
Sinokubonelela ngezi mveliso zilandelayo zokucoca ezinxulumeneyo kwishishini lokuThumela.
