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: This report summarizes the results of 42 laboratory Jet Erosion Tests performed on Plexiglas tube samples obtained from the Lower American River (LAR) between River Mile (RM) 6.0 and RM 10.0. The results from these tests will be used by the U.S. Army Corps of Engineers, Sacramento District, in assessments of the erosion resistance of the LAR from increases in discharge from 115,000 cfs to 160,000 cfs from Folsom Dam. The test specimens were obtained from 22, 4 in.-diam Plexiglas tube samples. The variations in values of the measured erosion parameters may have been caused by variations in the materials for some of the tested samples (i.e., when the material changed from silt/sand to clay). However, the variations in results for many of the samples were due to changes in the quality of samples. The resulting values of Erodibility Coefficient, Kd, and Critical Stress, c, are very useful information in assessing the erodibility of riverbanks as well as the river bed itself. Because of the observed natural variability of the materials, combining the erosion parameters presented in this report with the drilling logs and local geology will provide beneficial results for assessing the stability of the LAR.

Laboratory jet erosion tests on the Lower American River soil samples, Sacramento, CA – Phase 2