Water quality assessment for Duhok reservoir, Duhok-Iraq

الملخص EN

The physicochemical water quality and trophic status assessment for Duhok reservoir were carried out during four seasons in 2011.

Water samples collected from three sites at three depths (surface, 2m, and 6m).

Duhok reservoir constructed in 1988 for different purposes of water supply, irrigation, and recreations.

The results showed that water quality is in an alkaline side of neutrality, conductivity value ranged from 750 to 1240 µS.cm-1.

Dissolved oxygen concentration decline under 5 mg.l-1 during spring and summer seasons, with a trend of decreasing DO concentration from the surface toward depth (6m) in all studied sites.

Based on TN: TP ratio nitrogen is a limiting factor for phytoplankton growth.

Phosphate concentration of lake water falls within the oligotrophic status, while for chlorophyll a and Secchi depth values the lake categorised as eutrophic