Typology of water resources in Uzbekistan. The water resources of Uzbekistan are part of the water resources of the Aral Sea basin, and consist of renewable surface and groundwater, as well as return water from anthropogenic use (waste and drainage water). There are two main river basins in the Aral Sea basin: the Syr Darya in the north and the Amu Darya in the south. Separate basins (closed, but related to the Amu Darya) are created by rivers such as Kashkadarya, Zarafshan, Murghab, Tedzhen, which lost connection with the main river many centuries ago. The Amu Darya is the largest river in Central Asia. Its length from the sources of the Pyanj to the Aral Sea is 2540 km, and the drainage basin area is 309,000 km2. It is called Amu Darya from the point where Pyanj connects with Vakhsh. Three large right tributaries (Kafirnigan, Surkhandarya and Sherabad) and one left tributary (Kunduz) flow into the Amu Darya River in the middle reaches. Further to the Aral Sea it has no tributaries. The maximum flow is observed in summer, and the minimum in January-February. This presence of flow throughout the year is very favorable for the use of river water for irrigation. As it crosses the plain, from Kerki to Nukus, the Amu Darya loses most of its flow to evaporation, infiltration and irrigation. The Amu Darya contains more sediment than any river in Central Asia, and its composition is one of the highest in the world (after the Yellow River in China). The main flow of the Amu Darya is formed on the territory of Tajikistan. The river then flows along the border of Afghanistan with Uzbekistan, crosses Turkmenistan and again returns to Uzbekistan and flows into the Aral Sea. More details can be downloaded here