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5 Conclusions
In this research, with the help of some experiments, the entering suspended load to
the 30 intake installed on the trapezoidal channel is studied. Using the obtained
data, it is determined that the entering sediment ratio in a Froude number between
0.35 and 0.45 (in the upstream of the main channel) is minimal. Therefore, it is
recommended that with the purpose of decrease in the suspended loads, the water
depth in the irrigation channels to be so adjusted that the Froude number falls into
this interval. Also it is proved that in a high roughness ratio, when the dividing flow
ratio increases, the rate of increasing the sediments entry decreases. Generally, we
conclude that the Froude number at the upstream of the main channel affects the
diversion flow ratio. The diversion flow ratio, in turn, has its impression on the
secondary current strength, and more importantly, on the stream tube dimensions,
both of great importance in the rate of the suspended load entry to the intake.
Acknowledgement The authors are grateful to the Water Resources Management Company of
Iran, Department of Applied Researches, for their financial support to this study.
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