I’ve been increasingly hearing about local governments installing flood sensors as a way to alert the public about high-water situations. There seems to be an increasing number of major flooding events in the news, like Hurricane Hellene last year and the Guadalupe River floods earlier this summer.
But there are numerous smaller flooding events all of the time that result from heavy rains. In Appalachia, where I live, and in places like the Ozarks and the Rocky Mountains, floods can spring up quickly along roads after a rain event, often from upstream rain outside the flooded area. Flood sensors are badly needed in some parts of the country.
The danger from local flooding is that roads suddenly go underwater and people drive into the flooded area, particularly at night. I heard from one County that said that residents blindly drive into flooded areas every year. Historically, local governments blocked off roads after local flooding, but doing so is a delayed response after somebody notifies officials that a road is flooded.
The ideal flood sensor system uses a sensor that can detect rising water levels. One company that makes these sensors is HyFi. These sensors can detect rising water before a full flood situation occurs. The ideal flooding system also includes a way to alert the public. In my County, there are text alerts issued when roads flood. The ultimate safety solution is a system that blocks off roads, using technologies like dropping a crossing gate, like those used at railroad tracks. Flood alerts can also use electronic signboards that warn drivers of a flood ahead on a road.
The ideal flood sensor system also includes some kind of broadband connectivity. Local public safety staff want to know when a flood is underway to be able to alert the public. In urban areas with great cell coverage, flood sensors can be connected via cellular technology. But in rural areas, a lot of areas have poor or no cell coverage, and the best solution is to connect flood sensors to a fiber network.
Flood sensor systems are a great safety measure along roads that quickly and routinely flood. It’s a lot harder to develop a flood sensor system that works during catastrophic flooding. In Hurricane Helene, the flooding was so severe that entire roadways and even whole towns were washed away in the floodwaters. Early during the hurricane, the cellular networks went dark after winds affected microwave dishes, and when floods washed away the fiber backbone lines that served all of the ISPs and cell carriers in the region. In areas with the worst flooding, the electric substations were also put out of service. There is a lot of speculation that many who died in the hurricane didn’t get any notice that the floods were of historical proportions.
But catastrophic floods are rare, while smaller floods are routine in some places. Flood sensors, along with the broadband backup, ought to be on the wish list of any locale that routinely floods. A lot of the people who die in floods drive into the rushing waters – something that could be avoided with good flood detection and alert systems.









