Hrazdan River

 In the Ararat plain it joins the Aras River along the border with Turkey. A series of hydro-electric plants have been constructed on the river. Its waters are in demand to irrigate crops.The river drains a total catchment area of 2,566 square kilometres (991 sq mi). Precipitation volume is 1572 million cubic metre from an annual rainfall of 257 millimetres (10.1 in) with a maximum of 43 millimetres (1.7 in) in May and a minimum of 8 millimetres (0.31 in) during August. The average temperature recorded in the basin varies from −3 °C (27 °F) in January to 26 °C (79 °F) in July with diurnal variation with the lowest night temperature of −15 °C (5 °F) in January and highest day temperature of 44 °C (111 °F) in July.The total flow in the river is 733 million cubic meter. The regulated outflow into the river, which forms the Ararat Valley, is utilized for irrigation and hydro-power benefits.