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 two dominant rivers in Iraq are the Tigris and Euphrates. The watersheds, including their tributaries, account for 100% of the country’s surface water.

All in all Turkey’s climate is defined as semi-arid, whereas nine types of climate are observed mediterranean climate, wet mediterranean climate, partially wet mediterranean climate, Black Sea climate, Partially wet Marmara climate, steppe climate, partially dry central anatolian climate, partially dry south east anatolian climate and continental east anatolian climate

Between 1950 and 1965, open irrigation canals were constructed in Turkey. Irrigation systems with canalettes have been introduced since 1965. Irrigation systems with canallettes were constructed between 1970 and 1980. By 1990, low and medium pipe network with advanced pipe technologies have been used.