Flood Warning System

The Hydrology Section operates and maintains a comprehensive County-wide storm monitoring system. The purpose of the system is to provide advanced flood warning capability, through the collection & dissemination of "real time" rainfall, stream flow, and reservoir data. Computer modeling of river and reservoir water systems is also incorporated, with close coordination with the National Weather Service (NWS), US Bureau of Reclamation, County Emergency Operations, and other regional agencies.

  County Automated FWS


The ALERT (Automated Local Evaluation in Real Time) Network consists of "real time" gauges located throughout the County that transmit hydrologic & weather data. These gauges allow for monitoring of rainfall, stream flow, reservoir releases, as well as other relevant data during storm events. County Flood Control personnel work with this data (and forecast modeling) to anticipate the location and timing of potential flooding. Emergency crews may be directed to areas of concern, with appropriate warnings and advisories issued through the NWS. In addition, the automated gauge network is instrumental in guiding reservoir operations associated with downstream river releases/flows and maximizing reservoir water storage.

The photos below depict typical automated (ALERT) flood warning system installations.

Alert (rain,weather,stream,res.)