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<br />warning for areas within the District's boundaries, At the time of this publication, southern <br />Jefferson County and the community of Buffalo Creek are not within the District, and are <br />therefore not protected by the flash flood program, The County may wish to consider adding the <br />Buffalo Creek area into the Urban Drainage and Flood Control District, thereby providing the <br />community with the District's flash flood warning capabilities, <br /> <br />Flash Flood Alarm Gages <br />Flash flood alarm gages consist of water level sensor( s) connected to an alarm or light located at <br />a community agency that operates 24 hours a day. Stages exceeding a preset level trigger the <br />alarm, The distance between the upstream alarm gage and the community determines the amount <br />of warning time, <br /> <br />Specifications for the construction of a cost-effective flash flood alarm gage system are available <br />from the NWS, Most of the required elements can be purchased "off the shelf." <br /> <br />A more sophisticated gage, consisting of a radio/electronics signaling package and antenna in a <br />self-contained enclosure, is also available, A water-level sensor pipe uses a pressure sensor to <br />provide single-level alerting, When an alarm is triggered at the remote station, an identifier <br />signal is sent to the control station. The following table lists the advantages and disadvantages of <br />the flash flood alarm gages. <br /> <br />Advantages and Disadvantages of Flash Flood Alarm Gages <br /> <br />Advanta es <br />Relatively inexpensive <br /> <br />Disadvanta es <br />Warns of flood condition only, no <br />indication of ma nitude <br />Lead time usuall short <br />Usually requires community <br />ex ertise in electronics <br /> <br />Sim Ie 0 eration <br />Provides instant <br />audio/visual alarm <br />Beeper-activated warning <br />reaches ke eo Ie <br /> <br /> <br />4. Flood Response <br />The community response system consists of the steps taken by a local community in response to <br />information that a flood is imminent. The community response system can be generally defined <br />as three steps that follow the local flood warning system, These steps are: <br /> <br />. Warn local residents <br />. Evacuate <br />. Re-enter <br /> <br />Need for a Response Svstem <br />A flood warning system by itself is useless, If it is to be effective, the community must have <br />procedures to ensure that people leave the flooding areas and that actions are taken to reduce <br /> <br />12 <br />