It’s an immense goal - to build a river discharge measurement system without the traditional limitations. It had to be small, portable and easy to use. It had to be so robust that it could measure in extreme flood or drought situations without changing instruments or user settings. It had to provide high definition data for critical decision making. And the data had to be immediately recognizable in the palm of your hand. The results speak for themselves, the SonTek RiverSurveyor S5 and M9 are revolutionizing the way discharge is measured in rivers and canals.