Seite - 1555 - in Book of Full Papers - Symposium Hydro Engineering

Bulletins such as Bulletins 118 [8], 138 and 158 on Surveillance. Emergency preparedness typically involves external agencies in the country where the dam is situated and as such is not dealt with in specific detail by ICOLD. 2.1 CONDUCT ROUTINE SURVEILLANCE A general framework for what is intended by “conduct routine surveillance” is summarised in ICOLD Bulletins 118 and 158 as illustrated in Figure 2 from ICOLD Bulletin 158 [5] which was taken directly from ICOLD Bulletin 118 [8], Figure 2. Framework for Surveillance (ICOLD B 118 and B 158) The definition and intended meanings of the terms failure mode require clarification in Bulletin 158 for instance by referring to ICOLD Bulletin 130 on Risk Assessment [9]. Bulletin 158 refers to the objective of early detection of significant failure modes and some sample potential failure modes of interest provided. These failure modes are clearly defined at a very high level in the dam system similar to the hazards and failure modes framework illustrated in Figure 21 of Bulletin 154. However, the manifestation of such adverse performance characteristics may occur late in the failure process, or be difficult to ascertain such as in the case with seepage, where differentiating between “normal seepage” and “failure inducing seepage” can be exceptionally difficult. Bulletin 158 is unclear with respect to what is meant by a failure mod;, what constitutes 1555