Ukujikeleza okuthe tye kunye nepitch kwesibhamu somlilo kunokulawulwa kude ukuze kutshizwe ngokuchanekileyo amanzi. Ukuhamba kwamanzi okutshiza kwahlulwe ngokwekholamu yamanzi okutshiza kunye nenkungu yamanzi okutshiza ukuhlangabezana neemfuno ezahlukeneyo zokulwa nomlilo.