why are there locks on the danube river
Danube The waterway is designed for large-scale inland vessels (110 Ã— 11.45 m) but it can carry much larger vessels on most of its course. The Danube has been partly canalized in Germany (5 locks) and Austria (10 locks). Proposals to build a number of new locks to improve navigation have not progressed, due in part to environmental concerns.
Blue Nile The Blue Nile (Ge'ez ጥቁር ዓባይ Ṭiqūr ʿĀbbāy (Black Abay) to Ethiopians; Arabic: النيل الأزرق‎; transliterated: an-Nīl al-Azraq) is a river originating at Lake Tana in Ethiopia. With the White Nile, it is one of the two major tributaries of the Nile. The Blue Nile supplies about 80% of the water in the Nile during the rainy season.