Reka twigire hamwe ku byuma by'inguni.

Ishyirwa mu byiciro ry'icyuma cy'inguni: Icyuma cy'inguni muri rusange gishyirwa mu byiciro by'icyuma cy'inguni gifite impande zingana n'icy'inguni gifite impande zingana hashingiwe ku bipimo by'impande zacyo ebyiri.

I. Icyuma gifite impande zingana: Icyuma gifite impande ebyiri zifite uburebure bumwe.

II. Icyuma cy'inguni kidahuje: Icyuma cy'inguni gifite impande ebyiri z'uburebure butandukanye. Icyuma cy'inguni kidahuje kigabanyijemo icyuma cy'inguni kidahuje impande n'icy'inguni kidahuje impande bitewe n'itandukaniro ry'ubugari bw'impande zacyo ebyiri.

Ibiranga icyuma cy'inguni:

I. Imiterere yayo ifite inguni itanga imbaraga nziza zo kwihanganira imizigo.

II. Kubera imbaraga zimwe zo gutwara imizigo, icyuma cy'inguni kiba cyoroshye mu buremere, gikoresha ibikoresho bike, kandi kigabanya ikiguzi.

III. Itanga ubworoherane bwinshi mu bwubatsi kandi ifata umwanya muto.

Bitewe nuko ihendutse kandi ihendutse, icyuma cy'inguni gikoreshwa cyane mu nzego zitandukanye nko kubaka inyubako, ibiraro, imiyoboro y'amazi, iminara y'amashanyarazi, amato, inyubako zishyigikiwe, n'inyubako z'ibyuma, bifasha gushyigikira cyangwa gusana inyubako.