The technical status of the monitoring equipment as well as the computational and graphic computer analysis allow us to gain an insight into the connections and interrelations between a dam and its foundation rock, which -for all questions of stability- are of great importance. The experiences derived from monitoring results of many years and of particular dams can also be used for monitoring and operation of others dams. After several phases of premier and repeated reservoir filling, the direct linear relations between reservoir level and uplift pressure expected at first did not show up at the observed object, but apart from reversible uplift pressure increases also very high irreversible portions, which made initial prognosis of further developments substantially more difficult. Following is to be noted as result of the analyses: Prognoses of reservoir level areas which up to now have not been dammed up require a curve, which results from the sequence of reservoir levels achieved for the first time together with the appropriate measured uplift pressure. It indirectly reflects the hydraulic situation in the rock foundation and can have very different qualitatively and quantitatively appearances from survey point to survey point already within distances of a few meters. The method is universally applicable, particularly as the "normal case" of an unaffected uplift pressure reduction is included as borderline case.
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