Umufariso wo hasi ufata neza kugira ngo ukureho ivumbi ku nkengero no ku mapine

Ubwa mbere, kura urwego rw'uburinzi bw'umusemburo mu mwenge uri inyuma, hanyuma urushyire hasi ku butaka busukuye kandi butarimo amazi, kanda agace k'umukungugu gafata hasi ukoresheje umukandara, hanyuma ukureho urwego rw'uburinzi mu mwenge uri imbere, kugira ngo ubashe gukoreshwa (niba ubuso bwa firime butwikiriwe n'umukungugu mu gihe cyo kuyikoresha, kura urwego mu mwenge. Bityo ushobora gukoresha urwego rukurikira rwo gusukura rwa firime.) Nkuko mubibona, intambwe ya mbere n'iya gatatu zirabonerana, kandi ibi ni byo twita urwego rw'uburinzi. Urwego rw'uburinzi rukoreshwa mu kurinda umupfu mbere yo gukoresha isukuye. Uretse urwego rw'uburinzi, buri urwego rufite ikirango cya 1, 2, 3, 4.... kugira ngo ku mfuruka 30, byorohere abakiriya muri uru rwego umukungugu ufata, usimbuze urwego rushya.