Scour is now one of the main problems for river as well as for coastline engineering. Bridges are the vital structure which must be designed to prevent failure against scour effect. Scour hole is liable without warning for the failure of bridge. The main significant issues in hydraulic and river Engineering is to determine the connection between parameters affecting the maximum and minimum depth of scour. The scour depth in the alluvial stream below the river bed differs based on the flows, pier shape, pier size and sediment characteristics. Dual bridges of basically same structure are parallel placed and only a small distance away from existing bridge either on upstream or downstream side. Naturally, the backwater generated by dual bridges is bigger than that of a single bridge but lower than the value resulting from separate consideration of the two bridges. In the present work, hydraulic model is used to simulate stability of bridge in study area namely as ‘Sardar Bridge’ on Tapi river. Scour profiles for various flood events have been assessed on particular bridge. The velocity of flow is used to estimate depths of scour at different piers and abutments. Estimating depth of the scour during the design can significantly decrease the overall cost of bridge foundation construction. Result from present study shows that construction of new bridge should be proposed on the upstream side rather than downside side of existing bridge. By doing so, hydraulic stability of the existing bridge is ensured.

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