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<br />many components are automated. A fully automated system consists of automated <br /> <br />precipitation and river gages, a radio data transmission system, and a <br /> <br />computer to process the data and provide a flood forecast. Two examples of <br /> <br />modern automated flood warning system (ALERT and IFLOWS) are described below. <br /> <br />. <br /> <br />The following table lists the advantages and disadvantages of an automated <br /> <br />. <br /> <br />system. <br /> <br />Automated 5yst_ <br /> <br />AdvantaJ;les <br /> <br />DisadvantaJ;les <br /> <br />o Provides timely, accurate <br />reliable data and warnings <br /> <br />o High initial cost <br /> <br />o Requires high level of expertise <br />to install and in some cases to <br />use <br /> <br />o Provides stable data <br />network <br /> <br />o Maintenance costs of hardware <br />and software may be substantial <br /> <br />'I . <br /> <br />o Provides comprehensive <br />historical data base <br /> <br />o Software support may be limited <br /> <br />. <br /> <br />o Continuously updates infor- <br />mation to provide current <br />(real-time) data as it occurs <br /> <br />o May require costly periodic <br />replacement <br /> <br />G.3. ALERT <br /> <br />The Automated Local Evaluation in Real Time (ALERT) system, a typical <br /> <br />automated local flood warning system, was developed by the NWS California- <br /> <br />Nevada River Forecast Center in Sacramento, California. Available from <br /> <br />private vendors, the ALERT system is being adopted at a growing number of <br /> <br />sites for flood warnings, reservoir management control, flood fighting and <br /> <br />data acquisition. The system consists of automatic self-reporting river and <br /> <br />rainfall gages, a communications system based on line-of-sight radio <br /> <br />39 <br />