الفهرس 
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Abstract
Field experiments were conducted in the experimental farm of Sakha Agr. Station of Agric.
Centre of Cotton Centre Egypt during the season 2011. The following work is carried out
:Laboratory experimental work and field experimental work to study the effect of some engineering
factors, slope (0.05, 0.1 and 0.0% level) and inlet flow rate (1.5, 2 and 2.5l/s/ orifice) on water
distribution uniformity from gated pipes and also effect of land leveling, different water discharge
and distance between hills (25, 30 and 35cm) on seed cotton yield . The results indicated that: The
highest value of water distribution uniformity along the gated pipes was about 99.6 % and the flow
variation through 0.4 % in case of the gated pipe system under 0.46 m pump pressure head at 6 m
distance length from the pumping unit and discharge 57.6 m3/h.The water discharge 2.5 l /S/ orifice
saved irrigation water by 40.49, 28.85 and 24.54 % under 0.1% land leveling , 0.05 % land leveling
and zero land leveling compared to the water discharge 1.5 l/s orifice. The highest values of seed
cotton yield were 12.1, 11.5 and 11.35 kentar per feddan were obtained from interaction between
0.1% land leveling, 2 l/sec/ orifice irrigation water discharge and 30 cm distance between hills ,
0.1% land leveling, 2.0 l/sec/ orifice discharge and 35cm distance between hills, and 0.1% land
leveling at 2.5 l/sec/ orifice discharge and 30 cm distance, respectively.