It was hard to fathom_whiteBG

…how to safely and accurately measure flood flows, turbulent flows in steep boulder fields, and flows over a wide range quickly.  This was the challenge we were presented when we entered the hydrometric field.  There is an effective way: it’s called Salt Dilution (ISO9555).  Salt-dilution discharge measurement is a method in which a known mass of salt is injected upstream of a conductivity probe and the conductivity signal measured.   But how do we validate the flow measurement?  How do we collect flows at a target level? How do we build a rating curve quickly and cost effectively when helicopter time is expensive?

We recently attended the NASH FLO-TILLA, Q COMPETITION, & BBQ during the 2017 CWRA conference in Lethbridge, AB.  A fun day of competition was had, complete with refreshments and food.  Contestants walked away with a better understanding of uncertainty and error for low flow measurements, some novel ideas for hydrometry, and a lingering doubt over their SWAG, except One that is.  Read our Sounding post to learn more.