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A physical and mathematical model used in the third tier of the California Department of Water Resources ' Urban Levee Geotechnical Evaluations Program Erosion Screening Process (ESP) is described. It has been developed and calibrated based on the results of Erosion Function Apparatus (EF A) test results of California river and levee soil samples, confirming the relationships re lating general soil classification to erosion resistance as a function of water-induced shear stresses. The model is used to assess erosion during normal andlor flood conditions for combined wind and current loads. An example calculation using the method is provided.