Long-Term Simulation of the Effect of Low Impact Development for Highly Urbanized Areas on the Hydrologic Cycle in China

For areas that are urbanized rapidly, the practice of Low Impact Development (LID) has gained an important place in stormwater management and urban planning due to its capability and beneficial effects in restoring the original hydrological cycle. The performances of LID alternatives can vary substantially due to different climate conditions. This study investigated the performances of three LID alternatives under a semi-arid climate in northern China on water balance. A numerical model, the storm water management model (SWMM), was employed to run 10 years’ rainfall events for these objectives. The efficiency index for water balance (Iw) is also introduced in this study and three LID alternatives are evaluated by using the above methodology. According to the research results, LID facilities have remarkable effects on water balance.

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