Having worked for 10 years within Hydromet Networks and Early Warning Systems, I recommend this World Bank recent guide , as key reference for modernization and maintenance prioritizing sustainability, based in experience from developing countries but practically valid elsewhere. “Grimes, David R.; Rogers, David P.; Schumann, Andreas; Day, Brian F.. 2022. Charting a Course for Sustainable Hydrological and Meteorological Observation Networks in Developing Countries. World Bank, Washington, DC. © World Bank. https://openknowledge.worldbank.org/handle/10986/38071 License: CC BY 3.0 IGO.” Figure: screenshot from Daniel Kull at live presentation, 2022-11-09. Hydromet people and functions, D. Kull.