1. Ishoba
Iciyumviro; ubuzima bw'amapine ni 100% mu muzigo usanzwe
Iyo umuntu afise uburemere burengeye 30%, ubuzima bw’ipine ni 60% vy’agaciro kasanzwe .
Iyo uburemere burengeje urugero ari 50%, ubuzima bw’ipine ni 40% vy’agaciro kasanzwe .
2. Umukazo w'ikirere
Iyo umukazo w’amapine uri hejuru cane canke uri hasi cane, bizogira ico bikoze ku buzima bw’ipine.
Iyo umuvuduko w’umuyaga uri hejuru ya 25% kurusha agaciro kasanzwe, ubuzima bw’amapine buzogabanywa n’ibice 10% - 15%,
Iyo umuvuduko w’umuyaga uri hasi y’agaciro kasanzwe, ubuzima bw’amapine buzogabanywa n’ibice 20% .
3. Ubushuhe
Iciyumviro: Gufata degre 30 y’ipine nk’agaciro kasanzwe, ubuzima bwo kwambara amapine ni 100%;
Iyo ubushuhe bw’amapine ari 50 degrees, ubuzima bwo kwambara bw’ipine ni 80% vy’agaciro kasanzwe;
Iyo ubushuhe bw’amapine ari 70 degrees, ubuzima bwo kwambara bw’ipine ni 70% vy’agaciro kasanzwe .
Ica kane, imodoka
Iciyumviro; Gufata inzira ya simenti nziza nk’urugero, ubuzima bwo kwambara amapine ni 100%
Iyo imodoka iriko iragenda mu nzira isanzwe y’amabuye, ubuzima bwo kwambara amapine ni 90% vy’agaciro kasanzwe .
Iyo imodoka iriko iratwara imodoka mu gice c’inzira y’amabuye, ubuzima bwo kwambara amapine ni 70% vy’agaciro kasanzwe .
Iyo imodoka iriko iriruka ku nzira z’umusenyi n’amabuye, ubuzima bwo kwambara amapine ni 60% vy’agaciro kasanzwe .
Iyo imodoka iriko iriruka mu nzira itarimwo amapantalo, ubuzima bwo kwambara amapine ni 50% vy’agaciro kasanzwe .