Iqhwa elinodaka ngokuvamile lenziwa ngamanzi olwandle noma ngomusakwe aingxube yamanzi ahlanzekile nosawoti, okuwuketshezi oluneqhwa, ithambile futhi imboza ngokuphelele impahla/izilwane zasolwandle njll. iqhwa leqhwa. Futhi, kulolu hlobo lweqhwa oluwuketshezi, lungampontshwa endaweni yokuhlushwa kusuka ku-20% kuya ku-50% kanye nokugcinwa ethangini, ukusabalalisa nokusingatha kalula.