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Abstract
Water-logging is defined as the state of land in which the subsoil
water table is located at or near the surface with the result that the
yield of crops commonly grown on it is reduced for the land, or if the
land is not cultivated, it cannot be put to its normal use because of the
high water table. Water-logging is serious problem in Egypt, because
the land subjected to water logging results in reduction of agricultural
production. The main objectives of this study are:
1- Study the effect of soil layer depth to impermeable layer, and soil
types on water logging in agricultural lands.
2- Study the effect of irrigation systems, and crop types on water
logging.
This study includes a theoretical study for water-logging time and
discharge with different types of soil and various Permeable layer depths
by computer program (Z-soil program). An experimental model is
performed using Surface Irrigation apparatus with different types of soil
and various Permeable layer depths also. Verification between
experimental work and theoretical study is investigated.
The effect of irrigation systems such as sprinkler, trickle, and surface
methods on water-logging time is investigated with different crop types,
soil types, layer depth, and latitude. Design curves for Egypt area are
drawn.
EI-Salhiya is taken as an application of this study, because water-
logging has appeared in some areas of El-Salhiya. Z-soil program is
applied on El-Salhiya soil type (sand soil with 172m layer depth).
Different methods of irrigation are applied on El-Salhiya with crops
which are cultivated in this area, and water-logging time is calculated.