Page - 1400 - in Book of Full Papers - Symposium Hydro Engineering

hs = ho [m] 3,2 ρw [kg/m³] 1000 g [m/s²] 9,81 γw [N/m²] 9810 [-] 1,1 1,2 1,3 1,5 1,7 hi [m] 3,52 3,84 4,16 4,80 5,44 T [kN/m] 30,14 35,16 40,18 50,23 60,27 Tsd = γsd * T [kN/m] 45,20 52,74 60,27 75,34 90,41 γsd = 1.5 Fig. 7 Calculation of membrane forces Membrane properties have to be tested on the supplied material by authorized test institutes. The rupture strength in longitudinal direction of the membrane for this project was tested in laboratory with minimum 670 kN/m witch gives a considerable safety margin of factor 9. 3. CONTROL AND REGULATION 3.5. RUBBER DAM MAIN SECTIONS The regulation shaft system is located on the left bank of the Gomti Weir. It is designed as multiple chamber system enabling independent control of each weir section. To operate the main rubber dam sections there are two modes available: • Manual operation mode • Automatic operation mode. Water supply for regular operation is provided by the water tank which is linked to the pump shaft. This reservoir with active storage volume of 2,630 m³ is large enough to serve as a buffer for regular operation. Operation mainly acting with two functions: Raising the rubber dam or lowering the rubber dam. Water filled Hydroconstruct rubber dams are operating at any pressure inside the weir membrane. Thus, the rubber body is stable in any position between full inflated and full deflated position. The state of the rubber dam is continuously monitored. The defining parameters are the head water level, the reservoir level and the pressure inside the related weir section. Capacity of the installed pumps (app. 60 kW) is designed for app. 2.5 hours filling time for the first filling of the main rubber dam sections B+C+D+E. The reacting times for normal regulation are in the range of 5-10 minutes. After big 1400