To monitor the water quality of a stream or river, one must accurately and continuously measure the flow rate. The goal of this project is to build an inexpensive, accurate, and reliable flow meter that will provide continuous flow rate data. Our meter design operates by using an ultrasonic sensor to determine the height of the stream as it passes over a weir. This height can be directly related to the flow rate of the stream. By combining flow data with other water quality measures (e.g., phosphorous concentration), one can quantitatively characterize the health of the stream.
Bocek, Peter, "Determination of Flow Rate Using Ultrasonic Sensing for Water Quality Monitoring" (2012). Symposium on Undergraduate Research and Creative Expression (SOURCE). 187.