Many engineering projects are undertaken on and around rivers, such as the construction of bridges and the placement of pipes under river beds. These engineering projects modify flow conditions away from those which occur naturally, inducing additional sedimentation and scour. This research will focus on a deep scour hole in the riverbed at the Alex Fraser bridge on the Fraser River in British Columbia. In this location a great deal of engineering work has been undertaken, leading to the development of the deep scour.
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.