An illustration of stage-discharge rating curves.

Almost everything we know about our global freshwater resources is due to the humble stage-discharge rating curve. The vast majority of all flow data ever produced is the derived result of a transform from a variable that is easy to monitor continuously (stage) to a variable that is impossible to directly measure continuously (discharge). This means we are dependent on rating curves for advancements in...

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An image showing stage discharge rating curve.

Extreme flows are extremely hard to gauge, hence we get very few gaugings to accurately define the top-end of stage-discharge rating curves. This is a problem. Whereas empirically calibrated functional relationships can be trustworthy for the purpose of interpolation, they can be notoriously unreliable for extrapolation. One needs to be very careful about extrapolating any rating curve to an ungauged extreme....

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Illustration of international rating curve standards.

Stage-discharge rating curves define a unique relation between water level and discharge, enabling continuous derivation of streamflow from water level record. This is important because water level (which is relatively easy to monitor) is only locally relevant whereas discharge (which is relatively difficult to measure directly) is the integral of all runoff processes upstream of the gauge. The vast majority of all streamflow data that...

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AQUARIUS Insider User Group.

Aquatic Informatics is a software company. Software is a set of algorithms that take inputs and produce some sort of output based on encoded rules. In order to be most efficient the human machine interface needs to be designed along a work flow of ‘best practice’. The AI user group meeting is one of our primary methods for ensuring that our software both ‘does the right...

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Peyto Lake in Banff.

The NASH symposium this year was held at the joint CWRA/CGU national convention in Banff, Alberta. This was the first joint convention between the Canadian Geophysical Union - the home of Canadian research hydrologists - and Canadian Water Resources Association - the home of Canadian water resources engineering practitioners. There has always been a big gap between research and practice in hydrology. Practitioners need to be...

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