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Abstract The aim of this study was to calculate the drag coefficient (Cd) , surface roughness (Zo) and friction velocity (U ) these characteristics are very imported in

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Figure

Table (1) the number and names of the types of arrays used in work and the concept of each one type  Name of concept of type
Figure {1-2}. The relationship between surface roughness and the drag coefficient
Figure {1-3}. The relationship between friction velocity (U R*R)   and the drag coefficient (Cd)
Figure {3-1}. Value of surface roughness ( Z0 ) to different types of obstacles.
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