الفهرس 
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Abstract
The aims of this study were: monitoring the sources of pollution on some of drains and canals in the chosing area of Dakahlia Governorate. Also evaluate water quality for irrigation, soil and plants in the selected region irrigated with this water. In this study three agricultural drains were selected, which receive sewage and industrial waste waters as following: drain No.1, drain No.2 and EL-Mansoura Al- Mustajas drain. Three canals were selected in the same area of study. These canals are as following: El dowwar, El jawaryah and El jabadah canals. The samples were taken from these drains as well as neighboring canals, soil and the plants that are irrigated by this water in these places. The results obtained can be summarized as follows:
The EC values of drain No.1 water ranged between 0.77 and 3.3 dSm-1 in the winter, while in the summer they fluctuated between 0.73 and 3.1 dSm-1. The evaluation of the EC values for the drain No.1 can be classified into two degrees of restriction on use: slight to moderate and severe according to FAO (1985). The pH of water sample of drain No.2 is in alkaline side 8.02 and 7.93 in winter and summer, respectively suddenly dropped to acid side 6.85 and 6.70 in sample Belkas Sewage in winter and summer, respectively. In general, the SAR values in water samples at the beginning of the drain before any outside pollution are lower than those at the end of the Al- Mustajad drain. According to FAO (1985) and U.S.EPA (2004 ) in, EC, SAR, NO3 –N, NH4-N, TSS, COD, BOD, micronutrients and heavy metals values of canals for water samples are problem-free (None). The soils used to be irrigated by drains were having high values of pH, EC and soluble cations & anions compared with the soils irrigated by canals. that using the polluted water of drains in irrigation wheat and rice , increased the wheat and rice grain contents of Cu, Zn, Cd, Ni and Pb compared to that irrigated by canals.