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<br /> <br />- -I!I- - - -I!I- - - -~- - - -I!I- - - -I!I- - - -I!I- - - -I!I- - - -i!l- - - -~- - - -I!I- - - -I!I- - - -I!I-- <br /> <br />The preceding plot depicts, for each day of the year, the <br />percentage of reporting long-term streamgages operated by the <br />USGS that recorded flows within each of the percentile categories <br />indicated above. For example, on October 27,2003, 10 percent of <br />the vertical scale is shaded red, indicating that 10 percent of the <br />long-term (30 years or more of record) streamgages that <br />transmitted data to the USGS's Water Watch system recorded an <br />average flow for the day that was a new record low for October <br />27. The largest percentile category for October 27, 2003 (green) <br />covers about 29 percent of the vertical scale, indicating that about <br />29 percent of the transmitting streamgages recorded average <br />streamflows that fell within the 25 to 75 percent ranking of all <br />historical values for October 27. The number of streamgages <br />reporting for a given day has been as low as 40 in the winter and <br />as high as 110 in the summer. (See data used for these plots) <br />