| 摘要: | 臺中環中路高架橋工程運用低衝擊性開發（Low impact development, LID）技術，將橋面雨水導入LID設施，再回灌於橋面分隔島植栽。然而此案例無監測計畫，無法得知設施成效。本研究採用模式工具（Storm Water Management Model, SWMM）以及環保署公告的保水量計算公式，評估此綠色公路逕流削減效益。SWMM模式模擬顯示設置LID設施後，年逕流削減可達43.5~54.5%。個別設施的逕流削減率由高至低為：入滲池、入滲溝、雨水貯集系統以及生態池。環保署計算方式結果，全部LID設施可提供5,365立方公尺的保水體積，為規定基準保水量（2,850立方公尺）的1.9倍。此案例使用1%的總工程經費施作LID，達到約50的年逕流削減量，證實LID為經濟有效的方式。
The Huangjong elevated road in Taichung city was incorporated with low impact development (LID) practices, aiming to collect rainfall and reuse it as irrigation water for vegetation on the road surface. However, there was no monitoring plan to evaluate the LID performance. This study applied SWMM model (Storm Water Management Model) and the EPA calculation methods to quantify runoff reduction of this case. The results of SWMM model showed that the annual runoff reduction was 43.5~54.5%. The runoff reduction rate contributed from different LID types was ranked at infiltration ponds, infiltration swales, rain barrels, and ecopond. The required water conservation volume of this road was 2,850 m^3, but the total LID practices collected 5,365 m^3 runoff which was 1.9 times of the required volume. These LID practices cost 1% of the total budget of this road and turned out 50% runoff reduction, confirming that LID is economic efficient and effective practices. |
