INTRODUCTION Water pollution is a serious environmental problem in the world. It is the degradation of the quality of water that reduces water unsuitable for its intended purpose. Anything which degrades the quality of water is termed as a pollutant. Water pollutants can be broadly classified as major categories namely organic, inorganic, suspended solids and sediments, heavy metals, radioactive materials and heat (Botkin and Keller, 2008). Wadi El-Rayan is a great depression (703 km²) situated in the Western Desert, 40 km southwest of El-Fayoum Province. Wadi El Rayan Lakes is one of the most recent man-made lakes. Since 1973, the depression has been used as a water reservoir for agricultural drainage water exceeding the capacity of Lake Qarun.
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