Improving stream tracer gauging techniques

Stream discharge, a measurement of the volume of water passing a location along a stream, is an essential variable in many engineering and scientific projects. Discharge can be measured by injecting tracer material (such as common table salt or coloured dyes) into a stream and observing how the material mixes in the stream channel. For many streams, tracer gauging studies are the only reliable and safe method to determine discharge, yet many uncertainties exist in the experimental procedure.