In the last few decades, the world population has been increasing rapidly. As a result of population growth and urban development, there is a rising trend in the construction of bridges in close proximity to one another. Only a few researchers pay attention to the negative effects of the close proximity of hydraulic structures. In the past few decades, several studies have been carried out around a single structure like a bridge pier. However, only a few researchers have worked on the close proximity of hydraulic structures. From the past literature, it was found that if the piers are present in close proximity, they affect the scour depth around the bridge piers. The present study was carried out in close proximity to hydraulic structures. Experiments were conducted in a standard recirculating tilting bed water Flume 12 m long, 0.60 m wide, and 0.70 m deep. The size of the pier, pipe, and groyne model used was 62 mm, 30mm, 40mm, and 110mm. The results showed that values of scour depth around the bridge pier at different angles of the groyne were minimal when the groyne was inclined at an angle of 150˚. On the other side, the scour depth was observed to be maximum when the groyne inclined at an angle of 90˚. Similarly, in the second case, increasing the spacing between the bridge pier and the submerged pipeline reduces interference effects, leading to a decrease in scour depth. The experimental and modeling results show comparable trends, supporting the validity of the experimental test.

Scour Depth, Interference, pipeline, Bridge pier, Groynes.