Quality assurance in hydrological measurement

This is an updated and extended presentation of the results of the IAHS Wor kshop on Quality Assurance in Hydrologic Measurement, held during the XXI G eneral Assembly of the International Union of Geodesy and Geophysics (IUGG) , Boulder, Colorado, USA, in July 1995. The main focus at Boulder was on ex perience with hydrological applications of the international standard ISO 9 002 and developments in rating curve theory. A case study of a quality assu rance system is presented. Progress in hydrometric quality assurance since the workshop and areas for future development are discussed.