Aswan Dam have been flooded by Lake Nasser. Before the construction of the High Dam, the Nile deposited sediments of various particle size – consisting of fine sand, silt and clay – on fields in Upper Egypt through its annual flood, contributing to soil fertility. However, the nutrient value of the sediment has often been overestimated. 88 percent of the sediment was carried to the sea before the construction of the High Dam. The nutrient value added to the land by the sediment was only 6,000 tons of potash, 7,000 tons of phosphorus pentoxide and 17,000 tons of nitrogen. These amounts are
Toktogul Dam day. Toktogul Dam Toktogul Dam is a hydroelectric and irrigation dam on the Naryn River in the Jalal-Abad Province of Kyrgyzstan. It is concrete gravity dam with height of and length of . It is a part of the Naryn-Syr Darya cascade. It is named after Toktogul Satilganov. The Toktogul Hydroelectric Station has installed capacity of 1,200 MW, which makes it the largest power plant in the country. It has four turbines with capacity of 300 MW each. Toktogul Reservoir (, ; ) is the largest of the reservoirs on the path of the Naryn River, a northern tributary of