Application of an Antecedent Precipitation Index Model in Estimating Stormflow Hydrographs for the Chungliaohsi Watershed at Liukuei Experimental Forest of Southern Taiwan

This study estimated sormflow hydrographs using an antecedent index (API) model in the Chungliaohsi watershed at Liukuei experimental forest of southern Taiwan. Based on the comparison analysis between the estimated and measured stormflow hydrographs from thirteen storm events, the API model was shown to be a relatively simple and reliable method for estimating stormflow hydrographs. The input data of this model requirement were only rainfall and four other parameters. The two representative parameters of Chungliahsi watershed were 0.9 for K value, and 0.5 for X value. I and S were the two representative parameters of Chungliaohsi watershed were 0.498 and 0.0055 for storm rainfall smaller 100 mm, and 0.573 and 0.0068 for storm rainafll larger 100 mm.