Key contacts:
Paul Pilon pilonp@ottawa.ijc.org
Janice Fulford jfulford@usgs.gov

Several new hydrometric instruments and measurement techniques (e.g., acoustic Doppler velocity and non-contact water level sensors have been developed over the last few decades and are being adopted for use by various national hydrological services. However there has not been an equal growth in the knowledge for establishing the uncertainty associated with the estimate of the measurement and in developing guidance and standards for the use of the newer instruments and techniques.

The World Meteorological Organization's Commission for Hydrology in recognizing these deficiencies identified at its Twelfth Session in 2004 the need to develop a proposal and to implement a project to assess the performance of flow measurement instruments and techniques. The projectis currently being implemented and will improve our understanding of the accuracy of various types of hydrometric instruments and techniques, thereby contributing to the management of water resources.

The NASH working group, being aware of this international effort, will collaborate and contribute where possible to increasing our understanding of the uncertainty and to develop the necessary documentation for systematic and appropriate application of the newer technologies.

Andre Zimmerman has been looking into the development of best practices for sal dilution gauging.

Gabe Sentlinger has been investigating methods for quantification of uncertainty of salt dilution gauging. These results were presented at the NASH symposium of the BC Branch CWRA conference Vancouver BC March 2013.