them to protect people and infrastructure. Locations for new sensors are selected in consultation with local governments (emergency management, engineers), watershed management authorities, state agencies, and the National Weather Service.
The sensors were originally developed as a student project to design an affordable, yet effective way to measure stream and river heights. The solar-powered sensors are attached to the sides of bridges. The sensors emit a sonar signal to measure the distance from the water surface to the sensor. The data are transmitted via cell modem to IFIS, where the information is publicly available.