…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?