Ikirere ku birwa bya Mariana y'Amajyaruguru biyemeje cyane cyane ku muyaga w'ubucuruzi kiranga ikirere gishyuha cya Ocianiya. Nubwo hari iminyururu ibiri y'ibirwa n'uburebure bwa kilometero zirenga 640 irambuye mu majyaruguru ijya mu majyepfo, ikirere bitewe n'umwaka mu birwa byose byo mu birwa, bisa cyane.
Rero, ku birwa bitanga ibihe bibiri byingenzi byumwaka: bitose kandi byumye.
Umubare ntarengwa wimvura ugwa hagati yimpeshyi kugeza mu ntangiriro yimbeho. Ubushuhe buza mukarere cyane cyane muburyo bwimvura ikomeye yo mu turere dushyuha tujya nijoro. Rimwe na rimwe ubushyuhe buri munsi bushobora guhagarika kwiyuhagira buhanitse bwo gushyuha, bitarenze igice cyisaha. Abagenzi bagomba kumenya ko mugihe cyimvura ku birwa hari inkweto zikomeye. Mu gihe cy'imvura, impuzandengo y'ikirere ku birwa ni +33 kugeza kuri dogere37, mugihe ubushuhe ikirere butagwa munsi ya 90%. Ikirere nk'iki nticyifuzwa cyane kubana bato kandi abantu bafite indwara z'umutima. Igiciro cyo kuruhuka muri iki gihe nicyo gito.
Ukuboza, igihe cyizuba gitangirira ku birwa, kikamara kugeza mu mpera za Kamena. Impuzandengo y'ubushyuhe buri munsi ni dogere +27. Muri kiriya gihe, hari umunezero wo kuruhuka ku birwa, kuko umuyaga ukonje utuje urimo uhuha ku nyanja. Igihembwe cyigihe cyubukerarugendo gihura nikiruhuko cyumwaka mushya, ikiguzi cyamacumbi muri hoteri muriki gihe kiranda inshuro nyinshi, ugereranije nibiciro mugihe cyimvura. Gusa mu ntangiriro yibiciro byimpeshyi biragabanuka gato. Kuva muri Werurwe kugeza kuri Gicurasi, muganga wubukungu rushobora kwishimira ku birwa atari ikirere kidasanzwe gusa, ariko nanone ibiciro byemerwa mu icumbi n'ibiryo.
