The length of the river is open to discussion. Depending on the source consulted, this ranges from 248km to 556km. Rainfall in the basin is about 644mm annually. The average temperature is around 16°C. The climate is semi-arid to arid in Lebanon, with annual rainfall of about 400mm

The annual amount of water used in Syria is about 15BCM. This comes from the Euphrates (50 per cent) and the Asi River basins (20 per cent). Of the water usage from the Asi River, 2,230MCM are used for irrigation, 320MCM for domestic purposes and 270MCM for industrial purposes. The total amount of water withdrawn from the Asi River is 2,730MCM

In all three riparian countries, the river is used mainly for irrigation, domestic water supply and hydropower. The Asi River is diverted to the Homs-Hama water channels and Ghab-Roudji irrigation systems to meet the needs of Lebanon and Syria. The water is also stored in the Zeita Dam for domestic and irrigation purposes and energy production.

Turkey-Syria Relations were affected throughout the Cold War era and into the 1990s. The water issue became a foreign relations matter once again when both countries began using the waters of the Euphrates-Tigris basin in the 1960s and building irrigation and energy-related projects.

The foundation stone of the dam was laid on 6 February 2011. On completion, the dam is expected to be 22.50 m high, with a capacity of 110MCM. Of that, 40MCM will be used for flood prevention and the rest for energy production, and irrigation (around 9,000 hectares of agricultural land).

The Islamic Republic of Iran covers a total area of 1.75 million km2 and is bordered by Armenia, Azerbaijan, the Caspian Sea and Turkmenistan to the north, Afghanistan and Pakistan to the east, the Gulf of Oman, the Strait of Hormuz and the Persian Gulf to the south, and Iraq and Turkey to the west.

In the year to date, the total agricultural, municipal and industrial water withdrawal has been about 100BCM, of which 41BCM from surface water, 58.8BCM from groundwater (qanats and wells) and 0.2BCM from desalinated water

Dams have always played an important role in harnessing precious Iranian water reserves, and the long-term objective of Iran’s water resources development plan is based on the control and regulation of water through dams. In 2015, a total of 647 dams were in operation, of which 352 are considered significant reservoirs, with a total capacity of 48.39BCM.

Iran is facing unprecedented challenges in securing water and food for its growing population, which is projected to reach 92 million by 2050. These challenges are due not only to Iran’s semi-arid climate and declining precipitation over the past decade, but also to mismanagement of water resources.

Sustainable water resource management in Iraq has no shortage of challenges. Some of Iraq’s water hardships, like seasonal floods and droughts, occur naturally. Many of the most disruptive and destructive problems are, however, man-made: water infrastructure debilitated from decades of war and neglect; inefficient and outdated agricultural practices; rapid population growth and urbanization; competing water management approaches within transboundary river systems; and the looming crisis of climate change. The government of Iraq has plans to address the situation but it remains to be seen whether major reform will transpire.