滯洪池為滯洪設施中之重要項目，能有效降低洪峰流量、遲滯洪峰到達時間或增加入滲等，且面對不同歷線型態，將產生不同滯洪、遲滯效果。本文為剖析滯洪池於入、出歷線作用下其滯洪容積之變化，研究係以伽瑪形入流歷線作為降雨型態之設計理念，並依據無因次滯洪理論分析法，利用數學解析方式探討受制已知入流歷線及洪峰消減程度相互影響下，於滯洪池內其滯洪容積對時間變化之模式，進而推求該滯洪池之最大滯洪容積，以期作為坡地開發設置滯洪設施時，在設計上之參考依據。

Detention ponds can effectively reduce the peak flow, delay the peak time of flood or increase the infiltration. The objective of this study is analyzing the detention volume change of detention ponds with rainfall under the gamma inflow hydrograph model. The change of detention volume, which is based on the influences of gamma inflow hydrograph and the extent of peak attenuation, investigated by using the non-dimensional detention theory and the related mathematical analyses. The minimum detention volume of detention ponds can be calculated, and the proposed estimation model of detention volume can be used for the design of detention facilities during the hillside development.