Ka duba nassin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar nassi: Nassi: Kamar yadda ya yi iƙirarin cewa zai iya daidaita ambaliyar Kogin Nilu, Fatimid Caliph al-Hakim ya gayyace shi don aiwatar da aikin ruwa a Aswan. Koyaya, Ibn al-Haytham ya tilasta yarda da rashin yiwuwar aikinsa. Tambaya: A ina aka ce an saki aikin ruwa?
Aswan