This research investigates the effect of implementing oriented groins on the scour and silting
processes in a straight channel. Combined physical and numerical models were used. Twentyseven
(27) runs were conducted in which the geometry of scour and silting associated with model
groins was evaluated. Groin models were angled at 60, 90, and 120 to the downstream channel
side wall with contraction ratios of 0.10, 0.15 and 0.20. The main goals of this paper were to evaluate
the effect of the three angles on the scour geometry on minimizing erosion adjacent to the
stream banks. Results were analyzed and were graphically presented and the percentages of errors
between the obtained results from the used models were reported to define the sufficient compatibility
between the used models. Simple formulae were derived to evaluate the scour and silting
parameters.