土地重劃促進土地的開發利用，除了改變土地利用的方式，也將影響排水行為。本研究以高雄市大樹區湖底段市地重劃區為研究對象(總面積約2.379公頃)，使用SCS-CN曲線法配合無因次單位歷線(SCS模式)及美國洪水管理模式(Storm Water Management Model, SWMM)兩種方法分析重劃區開發前及開發後地表逕流出流量，並分析重劃區主要道路如果全部使用透水性鋪面對降低重劃區排水出流洪峰之效果。本研究首先分析使用模式在本研究區域所需要的相關參數，然後以10年及25年重現期距降雨為模擬條件，進行地表逕流及排水出流之情境模擬。
模擬分析結果顯示，當重劃區道路為傳統非透水性鋪面時，SCS及SWMM兩種模式均能有效模擬分析洪水出流行為。當道路改為透水性鋪面時，雖然SCS模式沒有直接分析透水性鋪面的功能，但是若能夠適當減小模式中的CN值及增加集流時間，SCS模式也能夠進行有透水性鋪面時的洪水出流。使用SWMM模式分析結果顯示，重劃區內道路若全部使用透水鋪面，對於10年及25年重現期距降雨，重劃區洪峰出流量大約可分別減少19%及18%。在使用SCS模式有透水鋪面鋪面方面，利用國土利用型態表將CN值由85減小至76.7及增加集流時間(約原集流時間2.6倍)，模擬結果，對於10年及25年重現期距降雨，重劃區洪峰流量約可分別減少20%及18%，此結果與SWMM模式分析結果相似。綜觀上述分析結果顯示，SWMM模式與SCS模式均可用以模擬重劃區洪水出流行為，而且重劃區道路如果使用透水鋪面可顯著降低重劃區洪水出流洪峰。

The variation of surface runoff of the urban land readjustment area of 2.379 ha in the Hudi section of Dashu District, Kaohsiung City were numerically investigated in this study. The SCS-CN curve method (SCS model) and the Storm Water Management Model (SWMM) were used to simulate the surface runoff before and after the development of the land readjustment area. Both SCS and SWMM models could simulate the reduction of the peak of outflow of the readjustment area by replacing the main roads with permeable pavement.
The SCS model did not directly simulate the effect of reducing peak flow by replacing the main roads with permeable pavement, if the CN value could be appropriately decreased(changed 85 into 76.7) and the concentration time(for 2.6 times) can be increased in the model, the SCS model could also simulate the drainage peak flow. The results by SWMM model showed that replacing the main roads with permeable pavement, the peak of outflow from the readjustment area could be reduced by approximately 19% and 18% for the 10-year and 25-year rainfalls, respectively. The results by SCS model showed that the drainage peak flow in the readjustment area could be reduced by approximately 20% and 18% for the 10-year and 25-year rainfalls, respectively.

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