Abstract
In this paper, runoff curve numbers (CN`s) for a small forested mountainous catchment are estimated using rainfall-runoff data measured at Sulma experimental catchment every 10 minutes and a new guideline for applying the antecedent rainfall conditions (ARC`s) for small mountainous watersheds in Korea is proposed. Sulma experimental catchment is a typical natural mountainous basin with of forested land cover and CN`s are estimated to be in the range between 51 and 89 with median value of 72. The test hypothesis stating as 1-day ARC is better than 5-day ARC in determining CN`s for a small mountainous watershed is shown to be acceptable. Also, linear regression equations for the estimation of CN`s for small mountainous catchments are proposed. As there is no significant investigations available on CN`s for small mountainous catchments, the newly proposed relationships between CN`s and ARC may be used as a preliminary guideline to assign CN`s for the estimation of floods from rainfall data on mountainous regions.
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