Fig. 8
The changes in BOD (a), COD (b), NH4 (c), and PO4 (d) of Lake Manzala water at the different sectors during winter, summer, and mean in 2015 and 2022. Values of PO4 (ˬµg/L) were divided by 5, and NH4 was multiplied by 10 to improve and illustrate the graph.
