valley of the Velika Morava's right tributary Resava). The average discharge of the Velika Morava on its confluence with Danube is 255 m³/s (120 m³/s brought by Zapadna Morava, 100 m³/s by Južna Morava, and 35 m³/s amounted by the Velika Morava itself). Tributaries Tributaries of the Velika Morava are short, the longest one being the Jasenica (79 km) and others rarely exceeding 50 km. Right tributaries are: Jovanovačka reka, Crnica, Ravanica, Resava and Resavica (or Resavčina). Left tributaries are more numerous, including: Kalenićka reka, Lugomir, Belica River, Lepenica, Rača, and Jasenica. Many of them don't carry much water, but in rainy years, they are known for causing major floods, which has been a big problem for the entire Morava river system. Before it meets the Danube, the Velika Morava splits, creating a 47 km long arm called the Jezava, which flows into the Danube separately, in the town of Smederevo. It's joined by a longer (51 km) river, the Ralja, from the left. Improvements The Velika Morava represents a textbook example of a meandering river. It used to be 245 km long, but directly from its origin to the Danube, there is only 118 km in distance; its meandering ratio is 118:245, one of the highest in Europe. The river bed is 80–200 m wide, and the depth as much as 10 m. Notorious for its flooding, the Morava has changed its course many times, and old river bends have become small lakes, known as moravište. Južna Morava, with extremely high erosion in its drainage basin, brings huge amounts of silt which is elevating Velika Morava's river bed, making floods even more frequent. Beginning in 1966, huge works began on all three rivers to prevent future floodings. Series of reservoirs were made on tributaries (lakes Bovan, Ćelije, and others) and meanders were cut through, making river courses straightened, which made them shorter (in the case of the Velika Morava, from 245 to 185 km). It was projected that it would shorten by as much as 152 km, and that it would become navigable again. The Morava and its tributaries still flood often, so its bed remains elevated, despite dozens of gravel-digging companies in cities and villages near the river's upper course (Lozovik, Lugavčina, Lučica, Velika Plana, etc.). Navigation Today, Velika Morava is navigable for only 3 km from its mouth. In the past it was navigable all the way