Over the past decade, many countries have been upgrading their water monitoring systems and their data collection efforts, supported with new information technologies and web‑based communication. A review of the information demands arising from OECD work, shows that important gaps still remain. The quality of water data currently available at national and international level is insufficient to effectively support integrated water management and water policies. Gaps in information on the economic and institutional aspects, for example, constrain the analysis of water policies and their effectiveness. Information on water resources and hydrological systems, though available in many countries, remains incomplete and.
