Abstract
Employing 10 years daily rainfall–runoff data, frequency-based design curve numbers (CNs) of different rain durations and for 2, 5, 10, 25, 50, 100, and 200 years return periods were derived for normal, dry, and wet weather conditions, representing 50%, 10%, and 90% probability of exceedance, respectively. Among the three distributions, Gumble (extreme value) type 1, log normal, and log Pearson type 3, the last performed better than the others. When compared, the design CN-values yielded runoff values quite close to the conventionally derived design runoff, exhibiting the validity of the derived design CN-values.
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