本研究目的在於建構工程實務可用之三角形單位歷線m值(limb ratio)，在水文紀錄資料有所缺失下，藉由少量地文資訊仍可推估三角形單位歷線合理的集水區流量歷線，而不會使數據過大或趨於保守。本研究以南化水庫集水區為例，架設兩處水深監測站，記錄2020年最大規模事件0516豪雨之水深歷線，將其以均勻流公式配合斷面測量估算其流量歷線，比對三角形單位歷線所推估之流量歷線，進而選定較適用之m值(limb ratio)，顯示南化水庫集水區採用m值3.33較為合理，此一結果可作為未來相關規劃單位之參酌。

The purpose of this study is to construct a triangular unit hydrograph m value (limb ratio) that can be used in engineering practice. With a small amount of geological information, a reasonable watershed flow history of the triangular unit hydrograph can still be estimated due to the lack of hydrological record data. Line without making the data too large or tending to be conservative. In this study, taking the Nan-hua Reservoir catchment area as an example, two water depth monitoring stations were set up to record the water depth history of the 0516 torrential rain, the largest event in 2020, and comparing the flow estimated by the cross-sectional surveyor and the triangular unit, select the more suitable m value (limb ratio), showing that the value of m is 3.33 is more reasonable, and this result is used for the future related planning work as part of consideration.