In response to the damage incurred due to recent extreme rainfall events, as well as the likely increasing frequency of such events due to global climate change, cities across the Nation are developing plans to prepare for future flash flood events. In 2021, the USGS, as part of the Next Generation Water Observing System, began installing a stormwater monitoring network in the cities of Madison, WI and Harwood Heights, IL. Part of this effort includes a vast network of LoRa-enabled sensors used to measure water levels in storm drains, pipes, and channels in areas that have a history of frequent flooding. While this effort was originally designed to facilitate calibration and validation of hydrologic models, it has since been revised to explore the potential to use this network as an early urban flood detection and warning system to city officials. In the summer of 2023, multiple storm fronts passed through both Madison and Harwood Heights, creating flash flood events throughout the city. This presentation will highlight the performance of the flood detection and warning network for those events and highlight the advantages and disadvantages of using the internet-of-things compared to more traditional means of data collection and dissemination.
