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General speaking, the 100-year ARI (Annual Recurrence Interval) with 24-hour duration storm generates the critical flood discharges and flood inundation depth all over the watershed. However, the real critical duration design storm may be something other than the 24-hour design flood event and perhaps there may be more than one critical duration storm that produces critical flood discharges and depth of flood inundation across the watershed. Usually, design flood with storm duration variation of the 3-, 6-, 12-, 24- and 48-hour with the 100-year ARI are used to identify the critical storm duration that produces the highest flood flows and also inundation level all over the watershed. This present study evaluates and demonstrates the impact of storm duration variation on generating a critical flood inundation. From this result can be selected the proper critical storm duration that produce the most severe flood inundation. In addition, Climate Change Factor (CCF) will be involved also in this analysis.