Ibhokisi lempahla elomile, kwesinye isikhathi elibuye libizwe ngokuthi isitsha esithwala impahla esomile, seliyingxenye ebalulekile yengqalasizinda yokuthengwa kwempahla. Ngemuva kokuthuthwa kwamakhonteyina ahlanganayo, amabhokisi wezimpahla athatha imisebenzi yokulethwa kwemayela lokugcina. Izimpahla zomdabu ngokuvamile zisezintweni zensimbi, kodwa muva nje, iphaneli entsha eyinhlanganisela—yenza isibalo ekukhiqizweni kwamabhokisi ezimpahla ezomile.