本研究利用標準常態分布之合成資料以可靠度分析探討不同規劃時期設計流量之決定,初步研究結果顯示,仍應以較長之資料所得之結果為設計流量。 The determination of design flow for different planning stages based on the reliability analysis by using the standard normal synthetic data is investigated in the present study. This preliminary study results indicate that the design flow should be determinated the data with larger sample.