Osman Sagar was created by damming the Musi River in 1920 , to provide an additional source of drinking water for Hyderabad and to protect the city after the Great Musi Flood of 1908 . It was constructed during the reign of the last '' ' Nizam ' '' of Hyderabad State , Osman Ali Khan , hence the name
Great Musi Flood of 1908
Great Musi Flood of 1908
Osman Sagar