Ka taƙaita labarin:  Fari a yammacin Amurka ya sa ruwan kogin Colorado ya yi kasa da yadda ya kamata. Lake Powell, tafkin da ke kan iyakar Arizona da Utah, bai kai ƙarfinsa ba da kashi 45 bisa ɗari, kuma rashin ruwa ya bar 'kewayen wanka' a kasan duwatsun da ke cikinsa. Tafkin, wanda daga baya kogin Colorado ya ratsa ta Grand Canyon National Park, ya yi hasarar galan biliyan 4.4 na ruwa a cikin fari na kwanan nan. Kogin kogin ya kasance yana fuskantar fari na shekaru goma sha ɗaya daga cikin shekaru 14 da suka gabata, yana rage tanadi wanda ya kasance kashi ɗaya cikin huɗu na girman Rhode Island lokacin da yake 'cikakken tafkin', a cewar National Geographic. Gungura ƙasa don bidiyo. Tafkin Powell, wanda shine babban tafkin ruwa na biyu mafi girma a kasar lokacin da yake da 'cikakken tafkin', yanzu yana da farin zoben wanka a cikin kogunansa daga faduwar matakan ruwa. Colorado yana ba da ruwa ga Nevada, Arizona da California, na ƙarshe wanda ya ga manyan yankuna a cikin 'tsananin' da 'ban mamaki' matakan fari kuma yana ƙoƙarin ƙuntata yawan ruwan da mazauna ke amfani da shi. Jihohi bakwai da mutane miliyan 40 suna samun ruwa daga sassa daban-daban na kwarin kogin, wanda ya fadada zuwa kudancin Wyoming. Yawancin masana kimiyyar sauyin yanayi suna tunanin cewa Kudu maso Yammacin duniya ma yana fuskantar babban fari a wannan ƙarni wanda zai wuce abin da ke faruwa a yanzu. Lake Mead, tafkin da ke kusa da Hoover Dam, ya ragu zuwa kashi 39 cikin dari na karfinsa a bara kuma ya kasance a matakin da ya fi ƙasa tun lokacin da aka gina madatsar a cikin 1930s. Don taimakawa sauran ajiyar su ci gaba da wadata, Lake Powell zai saki 8.23 miliyan acre-feet (2.68 tiriliyan galan) a cikin wannan shekarar. An kiyasta cewa sakin zai rage matakin ruwa a Powell, na biyu mafi girma a cikin kasar bayan Mead, ta wani mita. Yana cikin haɗarin ganin hawan samansa ya sauka ƙasa da ƙafa 1,075 sama da matakin teku a watan Satumba, wanda zai zama mafi ƙarancin matakin da aka rubuta, wanda aka saita a cikin 2005, kuma ya ƙara girman farin zoben sa. Ma'adanai a cikin ruwa suna juya bangon...
Goma sha daya daga cikin shekaru 14 da suka gabata sun kasance fari ga tafkin tafkin Powell. Reservoir a iyakar Arizona-Utah yana da kashi 45 cikin dari a kasa da'cikakken'damar. Tafkin zai kara faduwa yayin da yake ba da ruwa ga tafkin Mead na Hoover Dam.