Hydrology Corner Blog: extreme

Drones Hydrometry Perspective - Hydrology Corner Blog

Drones – Providing a New Perspective on Hydrometry

A different point of view changes nothing but it can change everything. Last week I wrote about how unmanned Aerial Vehicles (UAV), also known as drones, could be used for Large Scale Particle image Velocimetry (LSPIV) to get surface velocity measurements, which when combined with surveyed cross-sections can produce extreme flow gaugings. That same drone, equipped with the same camera, can also provide the cross-sectional information needed to complete the job.

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Extreme Gauging – How to Extend Rating Curves With Confidence

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.

More Water Resource Extremes? The New Normal Doesn’t Look Like Your Old Average Anymore

The theme of the Canadian Water Resources Association (CWRA) 2015 conference in Winnipeg this year was “More Extremes? Preparing for future challenges to Canada’s water resources.” Fittingly, the North American Stream Hydrographers (NASH) held 3 sessions that were dominated by discussions of how to resolve several of the daunting challenges inherent in measuring water. All…

Measurement of Absolutely Nothing

The Other Extreme – Part 1: the Measurement of Absolutely Nothing

Most conversations about extreme measurements focus on flood flow. However, I recently had a conversation with Emily Huxter about her thesis research focused on understanding stream ephemerality through the characterization of timing, duration, and spatial distribution of zero flow. Sounds easy so far, after all I used to call these measurements ‘windshield measurements’ because I…