If you need to collect open channel flow/discharge data in a small-to-medium size river, with all the ADCP options available, it can be a little overwhelming to know just where to begin. Do you need data immediately, or continuous data over a period of time? Is the river deep or wadeable? Do you need to account for rapidly changing flow conditions? These are some of the questions SonTek Product Manager Janice Landsfeld addresses during this short overview of some of the instruments you may consider based on your site configuration and monitoring requirements.