因應極端強降雨及都市不透水面積增加等問題，低衝擊開發設施(Low impact development, LID)經研究多次證明其減洪之能力。LID配置過往研究透過多種方法取得減洪效用較為優異之解法，或是針對特定目標進行配置最佳化。然而最佳化配置於實務上將面臨財政資源、土地有限等問題，進而反映除了減少之淹水面積等減洪效用外，更需考量成本，綜合評估LID之減洪效益。因應資金、土地有限等問題，本研究以「確保LID配置達到特定減洪效益標準」之角度切入，確保有限資金獲得有效應用。然而過往相關研究著重探討如何評估減洪效用最高之解法，故本研究嘗試探討如何評估達到特定減洪效益標準之LID配置。
過往研究指出可透過都市更新落實LID，且我國現有落實LID於私有地之相關法規均集中於都市更新地區，顯示都市更新地區具備落實LID之潛力。因此，本研究以高雄市一心一路、凱旋三路及三多一、二路沿線更新地區為研究範圍，並挑選淹水潛勢較嚴重之地區進行研究，以反映具備潛在減洪需求之地區。其後，建置SWMM及HEC-RAS 2D模型，並設定9種模擬情境。接續，運用降雨頻率分析計算不同重現期距之24小時降雨量，以模擬不同降雨強度之淹水情形。最後，運用TLAS模組計算不同模擬情境之災害損失及年計效益，並判讀益本比大於0.165者。
研究結果顯示，9種LID配置情境之減洪效用均於低重現期距降雨事件下較為優異，呼應LID針對低重現期距事件設計之定位。此外，設置多種設施類型之情境具備較優異之減洪效用，與過往研究結果相符。減洪效益方面，多數情境均達益本比標準，且最高者達1.357821。本研究另根據子集水區內土地使用將其分類，探討各類街廓達減洪效益標準之配置。住宅使用、公共利用土地為主之街廓較難達到減洪效益標準，而具商業使用之街廓則較容易達減洪效益標準。然而配置是否能夠達減洪效益標準仍受現況災害損失影響，故挑選LID推動地區需同時考量淹水潛勢及現況災害損失。待選定地區後，可優先於具商業使用之街廓推動LID，並依據達減洪效益標準之配置規範其面積配置方式及設施類型。藉由評估LID配置是否達到特定減洪效益標準，規劃者得以在資金有限之情況下初步了解應如何配置LID，確保資金得以被有效應用。

Previous studies focused on evaluating the optimal LID configuration, which may be constrained by fiscal and land constraints. Thus, "benefits" (cost-effectiveness) alongside "utility" (inundation reduction) should both be evaluated. While previous studies focused on evaluating optimal LID configurations rather than those that meet a cost-effectiveness baseline. Hence, this study evaluates whether LID configurations meet a cost-effectiveness baseline, ensuring limited funds yield commensurate returns.
Because domestic regulations concentrate private LID in urban renewal zones, this study designates the flood-susceptible renewal areas along Yixin 1st Road, Kaixuan 3rd Road, and Sanduo 1st and 2nd Roads in Kaohsiung City as the empirical scope. Subsequently, SWMM and HEC-RAS 2D models were developed for nine simulation scenarios. Next, rainfall frequency analysis was calculated for 24-hour rainfall depths across various return periods to simulate inundation conditions. Finally, the TLAS disaster loss module calculated disaster losses and annualized benefits, identifying configurations with a benefit-cost ratio greater than 0.165.
Results indicate all nine scenarios exhibit superior utility during low-return-period events, with multi-facility configurations performing best. Regarding cost-effectiveness, most of the configurations achieved baseline cost-effectiveness, reaching a maximum BCR of 1.357821. Commercial blocks achieved the BCR threshold more readily than residential and public blocks. Crucially, BCR feasibility depends on baseline disaster losses; thus, promoting LID in urban renewal requires concurrently assessing flood potential and existing losses. Once zones are designated, LID should be prioritized in commercial blocks and implemented in accordance with cost-effectiveness criteria to enhance urban resilience.

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