Abstract
This article presents erodibility criteria developed primarily from analysis of data collected by the NaturalResources Conservation Service [NRCS, formerly Soil Conservation Service (SCS)], and the Agricultural ResearchService (ARS), U.S. Department of Agriculture (USDA). Engineering performance studies were conducted at 125 earthauxiliary (emergency) spillways that experienced flow between 1983 and 1993. Hydraulic erodibility of rock and otherearth materials are evaluated in terms of a rational correlation between stream power and an erodibility classification ofthe materials. The classification system generates an index that enables characterization of virtually any type of earthmaterial ranging on a continuum from loose, cohesionless fine sand through massive, hard rock. The geologicalparameters that constitute the index include earth material strength, block/particle size, discontinuity/inter-particle bondshear strength, and shape of material particles and their orientation relative to stream flow. This article presents fieldprocedures and terminology used in the determination of these parameters.
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