調洪式土地使用規劃架構之研究

A Study of Land Use Planning Framework of Flood Mitigation

都市開發與擴張改變水文環境，集流時間的縮短增加地表逕流量，加以極端氣候致災害頻仍、強度驟增，提高水災發生機會並加劇災害影響。為了因應極端氣候造成的災害衝擊，各國政府或組織強調落實綜合治水概念於土地使用空間規劃，如風險管理（Risk Management）與洪水管理（Flood Management）等措施，期重新擬定治水策略以改變洪水形成的條件與洪水性質，減緩災害發生的機會與損失。然而，綜合治水概念落實於土地使用空間規劃將不可避免地衝擊土地發展與利用，過往研究較少論及土地使用減災措施對於經濟發展或是社會公平的影響，如何兼顧減災效率與地區發展需求仍挑戰規劃者的智慧。有鑑於此，本文以開發零增逕流為目標，組合與應用多種土地使用調洪措施於土地規劃流程中，嘗試建構調洪式土地使用規劃架構，期於規劃方案形成過程兼顧土地開發與環境效益。本文結合逕流分析與財務評估，進行調洪式土地使用規劃架構可行性討論，期供後續土地使用規劃作業過程中納入調洪式土地使用規劃之參考。

The transformation of Hydrological environment by urban development and expansion reduce water convergence and further increase surface runoff amount. In addition, extreme climate brings about frequent and intense disasters which have serious impacts of flood on living environment. In order to mitigate the loss from extreme disasters, each government and organization emphasize the integration of comprehensive storm and flood water control into land use spatial planning to change the forming condition and feature of flood, such as risk management and flood management. However, the integration of comprehensive storm and flood water control into land use spatial planning will inevitably impacts on economic development, social equity and land use development which are now challenging urban planners. Therefore, this paper attempts to establish land use planning framework of flood mitigation to look after both land developments and environmental benefits via combining various flood mitigation measures into land use planning to achieve zero increasing surface runoff. This paper integrates runoff analysis and financial evaluation to discuss the possibilities of land use planning framework of flood management for future planning reference.