Iraq relies in its water resources on
the water of the Tigris and Euphrates Rivers and their tributaries. The
long-term average annual flow of the Euphrates River was 30 BCM while it is
21.2 BCM for the River Tigris. The tributaries of the Tigris River contribute
about 24.78 BCM and in addition, there are side valleys from the eastern border
that contributes at least 7 BCM. The flow of these rivers decreased for since
the seventies due to the hydrological projects built in riparian countries and
climate change. Now, the discharge of the Tigris River and its tributaries at
Baghdad is about 16 BCM while it is about 4.4 BCM in the Euphrates.
Euphrates, Tributaries, Shat al Arab, Iraq.