近年來，在世界各地對於減緩洪水方面的策略，已經慢慢從傳統的工程方法轉變為基於自然的解決方法(nature-based solutions，NBS)，在國內，政府單位也在2020年提出在地滯洪的概念，透過加高田埂、道路提高等方式，希望能在暴雨發生時，利用農田蓄水，藉此降低河道流量，減少淹水災害。
為了探討在地滯洪之成效，本研究以雲林縣有才寮大排為研究範圍，利用美國環保署所開發之SWMM軟體建立在地滯洪模型，以10年重現期以及50年重現期24小時降雨當作輸入條件，模擬三種在地滯洪情境： (1) 改變田埂高度；(2)改變堤防高度；(3)改變孔口尺寸，透過以上三種不同在地滯洪方案組合，產生出125種在地滯洪方案，除了探討農田滯洪量增減對下游有才村淹水體積之影響，以及內水和外水滯洪效益，並找出最佳滯洪方案。
結果顯示，隨著田埂高度加高，農田的滯洪體積有增加的跡象，而當倍數慢慢提高，也就是田埂慢慢加高後，水位就無法越過田埂高度往另一個農田流入，漸漸地農田滯洪量就會趨於平緩。當堤防高度提高時，部分農田滯洪體積上升，部分農田則因外水無法流入，導致農田滯洪量減少。
在地滯洪能有效增加農田蓄洪體積，但也要考慮到內水滯洪與外水滯洪之配合，來達到最好的滯洪效果。此模式為快速分析在地滯洪成效，在未來，如果要進行更大規模的分析，希望藉此提供一個合理、快速的操作工具。

In recent years, flood mitigation strategies around the world have shifted from traditional approaches to nature-based solutions (NBS). In 2020, Taiwan government proposed the concept of on-site flood detention to reduce flood disasters. This study establish a SWMM-based hydraulic model to simulate the effectiveness of on-site flood detention strategy for YouCaiLiao watershed in Yunlin. Taking 10-year return period and 50-year return period of 24-hour rainfalls as input , we simulated three on-site flood detention scenarios:(1) adjust the ridge height ; (2) adjust the embankment height ; (3) adjust the orifice size. The results showed that the retention volumes in most farms increase as the height of the ridges and the embankments increase, but the increase rate tends to slow down as the heights increase. However, the water volumes detained in some farms reduce as embankments increase for having less external water flowing into these farms.
On-site flood detention can effectively increase the retention volume of farms if the internal and external water can be detained in farms at the same time. The model developed in this study can be used to quickly analyze the effectiveness of on-site flood detention, which can be applied in the future for large scale analysis.

1. Akhter, M. S., & Hewa, G. A. (2016). The use of PCSWMM for assessing the impacts of land use changes on hydrological responses and performance of WSUD in managing the impacts at Myponga catchment, South Australia. Water, 8(11), 511..
2. Bhowmick, A., Irvine, K., & Jindal, R. (2017). Mathematical modeling of effluent quality of cha-Am municipality wastewater treatment pond system using PCSWMM. Journal of Water Management Modeling.
3. Chang, T. J., Wang, C. H., & Chen, A. S. (2015). A novel approach to model dynamic flow interactions between storm sewer system and overland surface for different land covers in urban areas. Journal of Hydrology, 524, 662-679.
4. D.H.I.(2014). MIKE URBAN – Collection System. Horsholm, Denmark.
5. Elliott, A. H., & Trowsdale, S. A. (2007). A review of models for low impact urban stormwater drainage. Environmental modelling & software, 22(3), 394-405.
6. Förster, S., Kneis, D., Gocht, M., & Bronstert, A. (2005). Flood risk reduction by the use of retention areas at the Elbe River. International Journal of River Basin Management, 3(1), 21-29.
7. Freilich(2002). Miami-Dade County Agriculture and Rural Area Study Task 2(b)
8. Hamouz, V., Møller-Pedersen, P., & Muthanna, T. M. (2020). Modelling runoff reduction through implementation of green and grey roofs in urban catchments using PCSWMM. Urban Water Journal, 17(9), 813-826.
9. Hsu, M. H., Chen, S. H., & Chang, T. J. (2000). Inundation simulation for urban drainage basin with storm sewer system. Journal of hydrology, 234(1-2), 21-37.
10. Irvine, K., Sovann, C., Suthipong, S., Kok, S., & Chea, E. (2015). Application of PCSWMM to assess wastewater treatment and urban flooding scenarios in Phnom Penh, Cambodia: A tool to support eco-city planning. Journal of Water Management Modeling.
11. Innovyze(2014). InfoWorks ICM Help v5.0.
12. Jang, J. H., Chang, T. H., & Chen, W. B. (2018). Effect of inlet modelling on surface drainage in coupled urban flood simulation. Journal of Hydrology, 562, 168-180.
13. Liwanag, F., Mostrales, D. S., Ignacio, M. T. T., & Orejudos, J. N. (2018). Flood modeling using GIS and PCSWMM. Engineering Journal, 22(3), 279-289.
14. Loschner, L., Nordbeck, R., Schindelegger, A., & Seher, W. (2019). Compensating flood retention on private land in Austria: towards polycentric governance in flood risk management?. Landscape Architecture Frontiers, 7(3), 32-46.
15. Mioduszewski, W. (2014). Small (natural) water retention in rural areas. Journal of Water and Land Development, 20(1), 19-29.
16. O’Connell, P. E., Ewen, J., O’Donnell, G., & Quinn, P. (2007). Is there a link between agricultural land-use management and flooding?. Hydrology and Earth System Sciences, 11(1), 96-107.
17. Panos, C. L., Wolfand, J. M., & Hogue, T. S. (2021). Assessing resilience of a dual drainage urban system to redevelopment and climate change. Journal of Hydrology, 596, 126101.
18. Paule-Mercado, M. A., Lee, B. Y., Memon, S. A., Umer, S. R., Salim, I., & Lee, C. H. (2017). Influence of land development on stormwater runoff from a mixed land use and land cover catchment. Science of the Total Environment, 599, 2142-2155.
19. Phillips, B. C., Yu, S., Thompson, G. R., & De Silva, N. (2005, August). 1D and 2D modelling of urban drainage systems using XP-SWMM and TUFLOW. In 10th international conference on urban drainage, Copenhagen, Denmark (pp. 21-26).
20. Rossman, L.A. (2007). Stormwater Management Model User’s Manual, Version5.0. U.S. Environmental Research Agency.
21. Shiau, J. T., Chen, C. N., & Tsai, C. T. (2012). Physiographic Drainage-Inundation Model Based Flooding Vulnerability Assessment. Water Resources Management, 26(5), 1307-1323.
22. Sidek, L. M., Chua, L. H. C., Azizi, A. S. M., Basri, H., Jaafar, A. S., & Moon, W. C. (2021). Application of PCSWMM for the 1-D and 1-D–2-D Modeling of Urban Flooding in Damansara Catchment, Malaysia. Applied Sciences, 11(19), 9300.
23. Stelling, G. S. (2012). Quadtree flood simulations with sub-grid digital elevation models. In Proceedings of the Institution of Civil Engineers-Water Management (Vol. 165, No. 10, pp. 567-580). Thomas Telford Ltd.
24. Vanderkimpen, P., Melger, E., & Peeters, P. (2009). Flood modeling for risk evaluation–a MIKE FLOOD vs. SOBEK 1D2D benchmark study.
25. Wallingford.(1994). HydroWorks, Wallingford Software Ltd., Wallingford, U.K.
26. Yim, S., Aing, C., Men, S., & Sovann, C. (2016). Applying PCSWMM for stormwater management in the Wat Phnom sub catchment, Phnom Penh, Cambodia. Journal of Geography, Environment and Earth Science International, 5(3), 1-11.
27. 林旭信，(2005)，「都市雨水下水道系統最佳化操作模擬」，國立台灣大學土木工程學系研究所博士論文。
28. 林旭信，呂學建，李軒昂，(2015)，「都市雨水下水道人孔水位不確定性分析」，先進工程學刊，第十卷，第二期。
29. 行政院國家科學委員會補助專題研究計畫成果報告，(2021)，「在地滯洪於台灣實行之初步可行性評估及實行策略探討計畫」。
30. 程連育，林旭信，李軒昂，(2017)，「整合SWMM模式與Ice分散式計算平台探討分散式雨水下水道模擬可行性」，先進工程學刊，第十二卷，第二期。
31. 黃悅瑩，(2015)，「都市雨水貯集滯洪設施容量差別應用效益分析」，國立台灣大學土木工程學系研究所碩士論文。
32. 經濟部水利署，(2020)，「因應氣候變遷洪災韌性提升策略建構」。
33. 經濟部水利署水利規劃試驗所，(2021)，「有才寮排水在地滯洪擴大示範評估及實施方案」。
34. 盧尚甫，(2011)，「SWMM水理參數優選模式之開發」，中原大學土木工程學系研究所碩士論文。
35. 顏清連（1989），「臺北都會區大眾捷運系統防洪排水設計之研究」，臺北市政府捷運工程局，國立臺灣大學水工試驗所。