Principles. Apractical guide for the design of laboratory and field experiments, selection of appropriate instrumentation and experimental methodologies, as well as for conducting and analyzing experimental studies. Providing an end-to-end guidance to support experimentalists in the design and collection of the targeted data with prescribed accuracy. Currently, many studies are carried out in laboratories under less than ideal conditions that significantly influence the experimental outcomes e.g., secondary currents, flume aspect ratio and development length, etc and with instruments that are not always well tunned to the measurement ukryj opis