Abstract
The aim of the present study is to examine the water quality of Abu Simbel khor’s, Nasser Lake during the period of flooding and receding water to explores the potential pollution hazards coming from these Khors to the whole Lake through several physico-chemical and bacteriological analyses. Results obtained from calculated water quality index (WQI) showed that the drop in Lake Nasser water's levels led to a decline in the water quality of the Lake and Abu Simbel Khor, from the order of good (period of flooding) to medium (period of receding water). This impact may in turn influence the whole Lake due to water rebounce from the Abu Simbel Khor, to the main channel. Total dissolved solids (TDS), biological oxygen demand (BOD), turbidity and recognizable depletion in dissolved oxygen (DO) were observed in sewage station and affected on Lake Nasser water area adjacent seepage water area. Pollution from total and fecal coliforms as well as fecal streptococci didn't exceed permissible limits except for sewage station basin that discharge agricultural and sewage wastes are the key factors in this environmental problem, particularly in period of receding water. Therefore, it is further concluded that the Abu Simbel Khor, could be considered as potential pollution sources during low water levels of the lake.
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