Te maximum vertical settlement, based on instrumentation readings and numerical analyses, is 190 cm and 179 cm, respectively. Te maximum vertical stress at the core-foundation interface, obtained from pressure cell readings and numerical analysis, is 1205 kPa and 1440 kPa, respectively. Te maximum pore water pressure recorded by installed piezometers and from numerical analysis is 420 kPa and 450 kPa, respectively. The correlation coefcients between settlement data, pore water pressure, and total stress, derived from instrumentation and numerical analyses, are 0.67, 0.84, and 0.99,respectively, indicating a good agreement between the data. It is recommended to control the impounding rate of the reservoir to prevent increased pore water pressure during the impounding process and to avoid hydraulicfailure. Te purpose of back-analysis is to validate theparameters used for the materials in earth and rock flldams. Based on the instrumentation data for the Madanidam body and numerical analysis results, it can be concluded that the dam’s instrumentation system providesaccurate measurement and recording. According to the
back-analysis results, the parameters used for the materials, obtained from laboratory tests during dam construction, are accurate and reliable. Sensitivity analysis of t