الفهرس 
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Abstract
The present work was conducted to study the water quality control in open drain and its effect on soil properties. Therefore, the water quality monitoring program was designed to cover the whole changes in water quality along the stream of Gharbia main drain (in north-east part of the middle Nile Delta) which, starts north of Tanta city and flows by gravity to the Mediterranean sea at Balteem city. The objective of designing a monitoring program was to obtain information on physical, chemical and biological characteristics of water of Gharbia main drain.
Water samples were collected along the drain during 1997-
1988 years. These samples were collected at eight pump stations and seven open locations at distances of 68, 56.5, 45.7, 33, 31, 25 and 12 km from the sea, along Gharbia main drain. These samples were the subject to determine the studied water quality variables.
Forty soil profiles were dug at five locations along Gharbia main drain. These five locations allocated where the changes in water quality are expected along the drain. Disturbed and undisturbed soil samples were collected from each profile to determine the main soil chemical and physical properties. The saturated soil hydraulic conductivity was determined in the field. Water table depth and salinity were measured in the five locations along the drain.