Abstract:
Runoff data is the important data for water resources management. As the analysis of rainfall-runoff is difficult and complicate, therefore the objective of this study is to develop a GIS based continuous rainfall-runoff model. The language used in the model is Visual Basic for application on Microsoft Excel. The curve number from SCS method is referred in the model, which its value depends on the basin. From the selected study area in the Ping basin, it is found that the computed runoff volume is satisfactory. However, the computed characteristic of discharge hydrograph is quite different from the observed one. The computed maximum discharge is delayed by 3-5 days compares to the observed data depending on the slope of the topographic area and the distributed rainfall from the beginning of rainy season to the considering time.