Abstract The present work is aimed to assess the water quality status of Lake Edku using the data at various locations on the lake based on the Water Quality Index (WQI). Water Quality Index was applied in ten water quality parameters (pH, Dissolved Oxygen, biological oxygen demand, suspended particulate matter, Electrical conductivity, Nitrate, Nitrite ammonium and reactive phosphate. The results revealed that the pH values lie slightly on the alkaline side, with a range of (9.07 -7.47), Electrical conductivity (EC) showed a wide range (590–5125μS/cm) with an average 1871.88 μS/cm. The values of dissolved oxygen (DO) and Biological oxygen demand (BOD) ranged (1.56 to 18.10 mgl-1) and (0.91 and 15.90 mgl-1), respectively. Suspended particulate matter ranged between 16 and 122 with an average 37.81 mg/l. The range and the average values of nutrients (µM) were; 0.22- 67.3 (11.36), 1.54 – 80.04 (18.65), 0.11 – 37.29 (10.72), 1.33 – 108.38 (31.63), 1.36–70.97 (19.17) for reactive phosphate (PO4/P), ammonium (NH4/N), nitrite (NO2/N), nitrate (NO3/N), reactive silicate (SiO4/Si), respectively. The present study revealed that phosphorus is limiting nutrient factor (N/P > 5) in winter, spring and autumn but during summer (N/P < 5), nitrogen is limiting nutrient factor for plant growth. T The results of WQI of the investigated area ranged between1.59 and 32.79. Autumn, spring and summer recorded excellent water quality, while winter was lower of water quality comparing to other seasons.
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