Faduwar ruwan Blue Nile

200px|right|thumbnail|Abay, Blue nile fountain
Faduwar Ruwa Blue Nile ruwa ne dake kan kogin Blue Nile a Habasha. An san shi da Tis Abay a cikin Amharic, ma'ana "babban hayaƙi". Ya kasance a saman kwarin kogin, kimanin kilomita 30 (19 mi) zuwa ƙasa daga garin Bahir Dar da Lake. Faduwar ruwa na daya daga cikin sanannun wuraren shakatawa na Habasha.

Ruwayen suna da mita 42 (kafa 138), wanda ya kunshi rafuka huɗu waɗanda asalinsu ya bambanta daga abin gudu a lokacin rani zuwa fiye da mita 400 faɗi a lokacin damina. Dokar Tafkin Tana yanzu ta rage bambancin kadan, kuma tun daga 2003 tashar ruwa mai amfani da lantarki ta kwashe yawancin kwararar daga faduwar sai dai lokacin damina.Matt Philips and Jean-Bernard Carillet, Ethiopia and Eritrea, third edition (n.p.: Lonely Planet, 2006), p. 118 Faduwar ruwan Blue Nile ya keɓe yanayin halittar Tafkin Tana daga na sauran halittun na Kogin Nilu, kuma wannan keɓewar ya taka rawa wajen ci gaban dabbobin da ke cikin teku."526: Lake Tana" , Freshwater ecosystems of the world website (accessed 11 November 2009)

Shortan nesa kaɗan daga faɗuwa ya zauna gadar dutse ta farko da aka gina a Habasha, wanda aka gina bisa umarnin Emperor Susenyos a 1626. A cewar Manuel de Almeida, an sami dutse don yin lemun tsami a kusa da harajin nan na Alata, kuma wani mai sana'ar da ya zo daga Indiya tare da Afonso Mendes, Shugaban Itocin Orthodox na Habasha, ya kula da ginin.C.F. Beckingham and G.W.B. Huntingford, Some Records of Ethiopia, 1593-1646 (London: Hakluyt Society, 1954), pp. 26f
200px|right|thumbnail|Zubar ruwan a shekarar 2018 lokacin hunturu
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