THE INFLUENCE AND IMPLICATIONS OF A SINGLE EXTREME EVENT ON INTENSITY-DURATION-FREQUENCY (IDF) CURVES IN SOUTH CAROLINA

This paper examines extreme rainfall statistics associated with an event in central and eastern South Carolina during October 2015. We examine how precipitation during this event alters the statistics associated with intensity and return period. It includes analysis of issues related to the generation of Intensity-Duration-Frequency (IDF) curves of 1-, 2-, and 4-day rainfall totals, including: data availability, methodological choices, and uncertainty. First, we compare the IDF curves derived with and without the October 2015 storm. Second, we compare those created using annual maximum series and partial duration series and fitted by different models (e.g., Generalized Extreme Value, Gumbel distribution, and Pearson type distribution III). Third, we assess uncertainty associated with combination of choices listed above.