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PublicationHydrological Risk(World Bank, Washington, DC, 2021-04-22) World BankThis Technical Note contains a level of technical detail that non-specialists can use for guidance in addressing the hydrological aspects of dam projects early in the project preparation. It is intended to raise awareness and inform specific studies and investigations, as appropriate, during project preparation and implementation. The material presented should be used to prepare terms of reference on such studies and to assess the adequacy of methodology proposed by consultants in response to tenders for advisory services. It is recommended that, reading the Note, the client and the World Bank project teams will assess the required level of hydrological expertise in the teams. The hydrological subjects this Note covers are typical in World Bank–supported operations. There are several other subjects pertaining to hydrology that it does not cover. Enlarging the scope to those subjects will defeat the objective and turn the Note into a handbook on the vast discipline of hydrology. The same selective effort has been applied in choosing the references that the reader can consult to focus on specific subjects. For that reason, the list has been limited to essential references that provide general guidance on required hydrology studies, whereas the additional sources complement the general guidance with references dealing with specific aspects of the project hydrology. PublicationPortfolio Risk Assessment Using Risk Index(World Bank, Washington, DC, 2021-04-22) World BankThis Technical Note provides detailed information on the Brazilian risk classification system using the RI approach and the Indian RI system for the initial risk screening of a large portfolio of existing dams. Annex A provides basic information about the RI approach used in Quebec, Canada, for its dam classification system. These RIs are used for prioritization of required remedial works and other safety requirements. It should be noted, however, that RI is also a basic tool for preliminary level risk analyses for portfolios of dams and initial screening of risky dams, which may need to be supplemented by more advanced methods, depending on the type and potential risk of the dams. Because RI largely relies on visual inspection of the dams’ conditions, some critical failure modes could be missed. underestimated, or overestimated. In the higher risk cases, or whenever deemed appropriate, more detailed risk analyses, such as potential failure mode analysis (PFMA), can fill some of the gaps. PublicationGood Practice Note on Dam Safety(World Bank, Washington, DC, 2020-10) World BankThe objective of this good practice note (GPN) on dam safety is to provide additional guidance to World Bank staff on the application of relevant requirements under the environmental and social framework (ESF). This GPN provides guidance on using a risk management approach to the application of the dam safety requirements. The guidance contained in this note is designed to enhance the quality of practice without creating new requirements for the application of the ESF. The GPN provides guidance on compliance requirements, a risk management approach to dam safety, risk analysis tools, quality of information and capacity, application to World Bank operations, and procedural aspects. The GPN pertains to: (a) construction of new dams or dams under construction (DUC) under investment project financing (IPF); (b) rehabilitation of existing dams under IPF; and (c) existing dams or DUC that are not financed under IPF, on which the project relies or may rely.