Page - 1092 - in Book of Full Papers - Symposium Hydro Engineering

J16J17J18J19 J3J5J10 J2J6J12 J7J8J9J11J13J14J15J22 J20J21J23J28 J25J24J27J26J30J29J31J32 J4 120 220 210 110 130 160 150 140 170 180 190 200 Left bank 230 240 Right bank (m) ED D1D2D3D4 Measurement type: Manual Automated and manual Fig. 2 Location of the piezometers The automated measurement of the uplift pressure along the dam foundation is performed by vibrating wire piezometers, Geosense VWP-3000, converting fluid pressures on a sensitive diaphragm into a frequency signal and then into a uplift pressure unit (m H2O), Fig. 3. Fig. 3 Piezometer with automated readings. The main features of the vibrating wire piezometers VWP-3000 type, presented in Table 1, are suitable for the environmental conditions and the expected maximum range of the instrument, equal to 70 m H2O, which is considered adequate. Table 1 Piezometer VWP-3000 type, main features Pressure range 0 – 690 kPa Resolution 0.0255 %FS Accuracy 0.1%FS Non-Linearity <0.5%FS Temperature range -20 to 80 ºC Thermal effect <0.05%FS/ºC The uplift pressure measuring range in terms m H2O, for the 3 piezometers with more significative measurements, is presented in Table 2. 1092