River training is a process involving construction of structures across or along a river. The most common types of these training structures are groins. They are mainly used for bank protection against erosion and for channel rehabilitation and maintenance. The present study aims for simulating and predicting the flow pattern around nonsubmerged single groin. A two-dimensional hydrodynamic model was developed. The model was physically verified by using experimental results of a proposed physical model. The verification was carried out to assure the validity of the developed mathematical model. Specific runs were conducted to achieve this verification. The model simulation was focused on the study of velocity in the longitudinal and transverse directions. In addition, the lengths of separating and reattachment points were also investigated. Two effective parameters were tested through twelve runs conducted by the model. The first was the contraction ratio which is defined as the groin length to channel width (L/B). Four contraction ratios of 0.1, 0.15, 0.2, and 0.30 were used. The second was the groin orientation angle; three orientation angles were tested to define three types of groins. Angle 60 degree defines repelling groin type which was pointing to the upstream direction or opposite to flow direction. Angle 90 degree is defining the straight groin or the groin perpendicular to flow direction. Angle of 120 degree defines the attracting type groin which was pointing to the downstream direction similar to flow direction. A finite element mesh was designed for measuring purposes. The measurements covered about 48 grid points interpreted to four horizontal lines (A, B, C, and D) and 12 vertical cross sections from 1 to 12. The study cases represent several concluding remarks. For the reattachment length, it was found that all tested contraction ratios indicated resemble trend. The angle represented repelling groins had longer reattachment lengths if compared to the same angles of attracting ones. Furthermore, the straight groin gave the longest reattachment lengths. The contraction ratio of 0.1 was too short to show noticeable effect on the reattachment length. For the separation point length, the results show that all contraction ratios have similar trend and inversely proportional to the orientation angle. All attracting angles don't form any separation point length. Similar findings for contraction ratio of 0.1 on separation point length were observed for repelling groins.