الفهرس 
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Abstract
Introduction
There are many sources of pollution which receive over the course of the Nile River loaded with chemical and organic pollutants, which leads to many of environmental problems. Studies also indicated that the ends of the Rosetta branch, especially during the winter block, suffer from high levels of ammonia and a significant decrease in the value of dissolved oxygen and at this Time This helps to decrease the water column in the area, which coincides every year during the winter dam period. Which negatively affects the health of fish and leads to mortality and affects drinking water, which requires taking precautionary measures to reduce the concentration of ammonia in the river and drinking water.
Purpose of the study
This study was conducted to evaluate the effect of Nile water pollution in the Rosetta branch on fish and drinking water plants. A case study ((Edku and Rosetta) in the area at the Path from (212.5-230km).
To achieve this goal,
(24) water samples were taken from the Nile stream, intake of Edfina drinking water plant, and intake of EL -Gadia drinking water plant, and (24 samples) from the expelling of the two plants (the product of drinking water).
(12) samples of (tilapia) fish and (12 samples) were taken from the bottom of the Nile stream feeding (sediment) the two plants in the study area. The samples were taken at the same time monthly from June 2015 to May 2016.
Samples were prepared and preparation, and the concentrations of ammonia (NH3) and total dissolved solids (TDS) and total solids (TSS), chemical oxygen demand (COD), acidity number (pH) and total nitrogen (TN)) were calculated in samples of water from intake and purification product in the two plants.
The elements (mercury-cadmium-lead) were measured for monitoring in fish and sediment samples since these heavy metals are the most dangerous to health in the Egyptian environment due to their acute effect if they are found in high concentrations and have a cumulative effect.
Samples of drinking water were analyzed according to the standards of Egyptian drinking water in accordance with the Minister of Health Decision No. 458 of 2007 and raw water from the source of the Nile River in accordance with Resolution 92 of 2013 Article 49 according to the executive regulations of Law 48 of 1982. And the Egyptian standard according to the Egyptian Standard Standardization No. 2360 of 1993 and amended in 2007 regarding Determine the values of harmful heavy metals in foods. The results found that pollution in the Rosetta branch (the study area) increases where some values have risen above the permissible limits, which are chemically oxygen demand (COD), ammonia (NH3), and Total Nitrogen( TN) where these values were highest level during the winter due to the winter block And decreased in the rest of the seasons gradually in close proportions.
While these values decreased in drinking water after purification in all samples during the study period, and the results were disaggregated with Egyptian Ministry of Health and Population decree of the No. 458 of 2007.
The results of fish and sediment samples also showed the presence of concentrations of harmful heavy metals in sediments and fish, but they are within the limits permitted by the Egyptian specifications.
The study recommended
.The study recommended continuous monitoring of the Nile River, Rosetta Branch, especially the area under study to reduce pollution severity.