Wadi El Rayan project commenced in October 1968, following an increase in the water level of Lake Qarun, which posed a threat to the infrastructure constructed around it.

This is followed by the establishment of a covered canal measuring 5 kilometers in length and 3 meters in width at the Buqayrat Plateau, which ultimately discharges into the lake.

It is estimated that approximately 200 million cubic meters of agricultural drainage water enters the Rayan depressions on an annual basis.

The principal fish species observed in El-Rayan depressions include mullet, white tilapia, Zander, and carp bass.

[10] In addition to its function as a conduit for the disposal of agricultural wastewater, Lake El Rayan, situated within a verdant valley and surrounded by cascading waterfalls, represents a notable tourist destination.