The New Zealand Hydrological Society Technical Workshop was held in Dunedin, NZ from April 3rd to 6th this year. These technical workshops are tightly focused around problems and opportunities in field hydrology providing great inspiration for the betterment of water measurement and monitoring.
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.