Managing national hydrometric data: from data to information

The availability of high quality hydrometric data is fundamental to meeting the continually growing challenge of water management across the globe. River flow data, and environmental monitoring more widely, are acutely important during periods of actual or anticipated change. As such, the beginning of the 21st century has seen a heightened scientific demand for hydrometric information to help further understanding of variability in the global water cycle. This paper presents the experiences of the United Kingdom National River Flow Archive in managing large hydrometric datasets of international significance. The role of a National Hydrometric Information Service in relation to all aspects of the river flow monitoring cycle, from user requirements and network design, to information dissemination and decision making is considered. Current operational practices are outlined, including their applicability to other national hydrometric networks and the implications for end users of river flow information.