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The Hydrology Division maintains and operates a multi-component storm monitoring system. The purpose of the system is to provide advanced warning of impending flooding and to reduce the damages that may result. The system incorporates the collection of "real time" rainfall and stream flow data, computer modeling of river and reservoir systems, and coordination with the National Weather Service (NWS), Emergency Services, and other agencies. ALERT STORM MONITORING NETWORK The ALERT (Automated Local Evaluation in Real Time) Network consists of "real time" gages located throughout the county that transmit weather and other hydrologic data to the Flood Control District Operations Center. These gages allow for monitoring of rainfall, stream flow, reservoir releases, wind, as well as other essential data during a storm event. Using this data, Flood Control officials work to anticipate the location and timing of flooding. Emergency crews may be directed to problem areas and the appropriate warnings and advisories are issued through the NWS. In addition, the ALERT network is instrumental in guiding reservoir operations to simultaneously abate flooding downstream and maximize water supply. The
below photos describe typical ALERT flood warning system equipment, locations,
and operations.
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