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<br />. <br /> <br />. <br /> <br />APPENDIX A <br /> <br />GLOSSARY <br /> <br />Annual Peak Discharge <br />The maximum instantaneous stream discharge that occurs during the <br />year at a given location. In most cases it is determined by comparing <br />the highest stage recorded during the year to a stage-discharge rela- <br />tionship which has been established for the stream at the particular <br />location. During extreme events, it is usually based on a slope-area <br />analysis of the high water marks. <br /> <br />Beard's Statistical Method <br />This is an analytical method based on a log-Pearson type III <br />distribution similar to that presented in the Water Resources Council <br />(IiRC) Bulletin 17. The only difference in the two approaches as they <br />pertain to this study was the selection of the skew coefficient. The <br />Beard's method uses either zero skew or a regional skew. The IiRC <br />method weights the station skew with an appropriate generalized skew. <br /> <br />Catchment <br />A drainage area. In this report this refers to the small subareas <br />used to divide up larger drainage areas. In preparing data to be entered <br />into a hydrologic model, a large drainage area may be subdivided to <br />better reflect variations in soil, soil cover, and topography.' <br /> <br />Confidence Limits <br />A measure of reliability of the frequency curve discharge values. <br />The confidence range as shown varies from .OS to .9S. This means that <br />at a given return frequency, there is a 9S-percent chance that the true <br />return discharge exceeds the lower limit and only a S-percent chance <br />that it exceeds the upper limit. <br /> <br />A-I <br />