Direct link to the study: Perera, D., Smakhtin, V., Williams, S., North, T., Curry, A., 2021. Ageing Water Storage Infrastructure: An Emerging Global Risk.UNU-I

Direct link to the study: Perera, D., Smakhtin, V., Williams, S., North, T., Curry, A., 2021. Ageing Water Storage Infrastructure: An Emerging Global Risk.UNU-INWEH Report Series, Issue 11. United Nations University Institute for Water, Environment and Health, Hamilton, Canada. https://inweh.unu.edu/ageing-water-storage-infrastructure-an-emerging-global-risk/ https://inweh.unu.edu/ageing-water-storage-infrastructure-an... This seems like some stats run on the CIGB/ICOLD's database (world register of dams) https://www.icold-cigb.org/GB/world_register/world_register_of_dams.asp https://www.icold-cigb.org/GB/world_register/world_register_... And notably what they mean by a large dam: A dam with a height of 15 metres or greater from lowest foundation to crest or a dam between 5 metres and 15 metres impounding more than 3 million cubic metres The knowledge is already there, it's about funding and not overbuilding what you can't maintain. For the same reasons many bridges are reaching old age/end of life.