Seite - 744 - in Book of Full Papers - Symposium Hydro Engineering

5. SUMMARY AND CONCLUSION The following table summarizes the suggested FoS for each variable as discussed in this paper. Multiplying the different factors is assumed to represent the overall FoS. Table 5. Total FoS as a product of the individual safety factors. Variable FoS - Sliding FoS - Overturning Reference Design Accident Design Accident Friction 1,0 1,0 Not relevant Chapter 4.1 Water level 1,0 1,0 1,0 1,0 Chapter 4.2 Self-weight 1,08 1,08 1,04 1,04 Chapter 4.3 Pore pressure 1,40 1,00 1,20 1,00 Chapter 4.4 SUM 1,51 1,08 1,25 1,04 Overall FoS Current FoS 1,5 1,1 N.A.* N.A.* * Safety against overturning is defined by position of the resultant Elements constituting the total FoS given in the Norwegian dam safety regulations is not publicly available. The factors of safety suggested in the above table can, however, be used to justify the current requirements, but this has not been confirmed by the Norwegian dam safety authority. How different parameters affect the dam stability is essential when assessing the degree of uncertainty of the calculations. This will make it easier to identify which parameters that are most important for the stability and that influences the ucertainties of the overall dam safety. By improving the knowledge related to the individual variables, the uncertainties can be reduced and thereby reducing the overall required FoS for the dam in question. This is of particular interest in cases where existing dams do not meet the safety requirements. It must be underlined that results in this report is valid with the given methodology and assumptions described in chapter Fehler! Verweisquelle konnte nicht gefunden werden. and Fehler! Verweisquelle konnte nicht gefunden werden., and a validation of the results is recommended. 6. ACKNOWLEDGEMENTS We would like to thank EnergiNorge that has supported this project, and thereby made this contribution possible. 744