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<br />station located nearby. The receiver station keeps track of the accumulated <br /> <br />precipitation for each gage. (For areas in which precipitation can occur as <br /> <br />snow, a special type of displacement gage may be required; further information <br /> <br />on procedures for cold regions is contained in Rechard and Wei). Figure 8 <br /> <br />-, <br /> <br />shows a schematic diagram of a typical (non-snow area) automated ~r event- <br /> <br />reporting precipitation gage. <br /> <br />An automated stream gage is a simple event-reporting unit that transmits <br /> <br />preselected incremental changes in stream elevation. Every time the stream <br /> <br />rises or falls to a predefined elevation (for example 0.5 ft.), a signal is <br /> <br />sent to a radio transmitter, which instantly sends a signal to a receiver <br /> <br />station identifying the station and describing the change in elevation. As in <br /> <br />the automated precipitation gage unit, the receiver station keeps track of the <br /> <br />stream height for each gage. Rante (1982) provides further information on <br /> <br />standard stream gaging techniques. <br /> <br />In remote locations for which a stream gage is not available, a bubbler gage <br /> <br />can be used. Bubbler gages, which measure water pressure, can be located ~ <br /> <br />. <br /> <br />considerable distance from the stream and still provide accurate information <br /> <br />on stream elevation. <br /> <br />Automated precipitation and stream gages are reliable in operation. Since <br /> <br />they can be operated by battery without AC power, they can transmit critical <br /> <br />data in the harshest environmental conditions. <br /> <br />30 <br />