Water from the reservoir is diverted through a diversion weir at Addassiyah downstream of the Al-Wehda dam to the King Abdullah Canal where it is mixed with other freshwater sources.

In February 2004 King Abdullah II of Jordan and Syrian President Bashar al-Assad launched the construction of the dam.

The agreement was renewed in 2001 when the design of the dam was modified, reducing the storage capacity from 480 to 115 million cubic meters,[4] and removing a hydropower plant that had initially been foreseen from the plans.

According to a statement made by the Jordanian Minister of Water and Irrigation, Mousa Jamani, in April 2012 Syria violates the water sharing agreement, because Syrian farmers downstream of the dam use more than the 6 million cubic meters per year that they are entitled to for irrigation along the riverbank.

[6] "Israel took control of the Al-Wahda Dam on the Yarmouk river reservoir near the town of Al-Qusayr in Syria’s Daraa Governorate on the border with the Kingdom of Jordan, which provides for approximately 30% of Syria’s fresh water supply, and 40% of the fresh water supply of Jordan", reported Israeli journalist Amir Tsarfati.