[2] Future Lake Giba will occupy the plain where Sulluh, Genfel and Agula'i Rivers meet.

It is a confined river, locally meandering in its narrow alluvial plain, with a slope gradient of 9 metres per kilometre.

Peak discharges up to 300 m³ per second occur in the second part of the rainy season (month of August) when there are strong rains and the soils are saturated with water in many places.

The highest sediment concentrations occur at the beginning of the rainy season, when loose soil and dust is washed away by overland flow and ends up in the river.

[4] As such water contains many nutrients (locally it is called "aygi"), farmers estimate that it strengthens their cattle, which they will bring to the river.

On steep slopes, exclosures have been established; the dense vegetation largely contributes to enhanced infiltration, less flooding and better baseflow.

[3] Irrigated lands are established in the narrow alluvial plains along the river, particularly up- and downstream of Wukro.

The gorges are particularly attractive as a transhumance destination zone, because there is water and good growth of semi-natural vegetation.