在降雨逕流過程中，一場暴雨結束後會轉變成多少流量排入河川，土壤入滲是一個重要的關鍵。因此本文擬以數種不同的方式，對土壤入滲的部分做分析比較；以曾文水庫的入流量記錄，配合水庫集水區範圍附近之雨量站資料，針對颱風和梅雨所帶來之較長期的連續暴雨作降雨逕流分析，再利用線性規劃的方式求出單位歷線。
　　本文以曲線號碼法和Bauer所建議之入滲方法進行分析，比較兩種方法後可知Bauer所建議之入滲方法，較符合實際土壤含水量之變化狀況；因此試以此法補足曲線號碼法所缺失的地方。
　　模擬曾文水庫集水區實際暴雨案例的結果，雖然不甚良好，但是趨勢大致相似，其可能的原因在於對河川流量做基流分離時，基流量的估計失當所致；因為有效雨量經單位歷線轉換後，理應等於直接逕流量。若基流量估計錯誤的話，經過轉換後的有效雨量則會有偏大或偏小的現象發生。

　In the rainfall runoff process, infiltration is an important point to decide how many capacities into the river when a rainstorm is stopped. Therefore, the paper considers using several different methods to compare the part of soil infiltration. Using the inflow and rainfall data of Tsengwen reservoir, make the rainfall runoff analysis of the long-term continuing storms which are taken by plum rains or typhoon. Then, we get the unit hydrograph by linear programming.
　This paper is compared the method suggested by Bauer and curve number method. The result of the method suggested by Bauer is conformed to the condition of the actual soil moisture content. Therefore, we try using this contention to make up the short of curve number method.
　The result of simulating the rainstorm cases of watershed of Tsengwen reservoir isn't well, but the tendency is similar. The possible reason is that the base-flow separation to the river flow isn't made well. Because the excess rainfall is transformed by the unit hydrograph, the capacity should be equal to direct runoff. If the base-flow is estimated unreasonable, the transformed excess rainfall may be occurred larger or smaller situation.

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