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The study confirmed that the Vaiont Slide was a reactivation of an old slide. The slide moved upon one or more clay layers which were continuous over large areas of the surface of sliding. Three-dimensional stability analyses were required due to the magnitude of the upstream inclination of the clay layers forming the base of the slide. The angle of shearing resistance of the clay layers was determined to be about 12 degrees. The fluid pressure distributions used were consistent with the only piezometric data available before the 1963 slide and with an interpretation of the local groundwater flow system including the presence of karstic terrain above the slide. Results of the analyses completed for key periods in the history of the slide agree with the known slide behavior during these periods. The results also indicate that the reduction in the factor of safety caused by reservoir filling alone was approximately 12 percent, while the reduction caused by rainfall or snowmelt ranged from 10 to 18 percent. Correlations made between cumulative precipitation, reservoir levels, and slide movement records provide a well- defined 'failure' envelope. These results explain why the slide was unstable at a given reservoir level and later stable at the same level. Conclusions from these correlations are consistent with the results of the stability analyses. The results of the study also suggest that the slide could have been stabilized by drainage., See also Volume 2, ADA158193. Original contains color plates: All DTIC and NTIS reproductions will be in black and white.

Appendices: Precipitation Records Erto 1960 to 1963; Static Slope Analysis Method Used for the Vaiont Slide Analyses; Sections Used in Stability Analyses; Three-Dimensional Slope Stability Calculations; Calculation of Slide Velocities; Heat Generated Pore Pressure Mechanisms; Summary of Geological Studies on the Slide at Vaiont, 1959-1964., See also Volume 1, ADA158192.

Busto de frente, con cofia, dentro de un óvalo sobre un pedestal, Inscripción en el borde inferior: "Ann of Cleves / Queen of K. Henry the VIII", Páez, Elena. Iconografía Britana, O'Donoghue, Freeman. Catalogue of engraved British portraits..., Busto de frente, con cofia, dentro de un óvalo sobre un pedestal, Firma del grabador F. Patton en el borde inferior derecho, Título tomado de la inscripción en el borde inferior, Fecha tomada de "Catalogue of engraved British portraits..."

An outburst of warm springs together with the development of an extensive area of high pore-water pressures occurred during the first filling of the 50m high earth and rock fill Itezhitezhi Dam on the Kafue River in Zambia. These and other unanticipated events led to extensive geological and hydrogeological investigations that resulted in the implementation of unusual remedial measures. The remedial work was completed before the reservoir reached its full supply level. The dam has since performed successfully. The problems are reviewed in terms of the significance of the site geology. The hydrogeologic problems were found to be caused by the presence of a modified karstic terrane developed on a mineralized, faulted and deeply weathered bedrock of granite and associated rocks. Small differences between the river levels and the piezometric levels in deep porings contributed to a delay in problem identification. The problems encountered and their causes are thought to be without precedent.