A method to predict the maximum pier scour depth in cohesive soil of a bridge foundation was proposed by Gudavalli (1997) after conducting experimental research on pier scour using circular piers in deep water condition. Data for single circular piers in deep water condition Gudavalli (1997) and Li (2002) were collected and re-analyzed to develop a new pier scour equation. It was found that the contraction scour depth normalized by the water depth was linearly dependent on the difference in the Froude numbers, and was independent of the contraction length and shape after data regression. The SRICOS method developed by Kwak (2000) for multi-flood and multi-layer systems is applied to actual cases of scour. The SRICOS-EFA method was developed to predict bridge scour depths, such as pier scour, contraction scour and abutment scour, in cohesive soils on the basis of flume tests.
