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The study adopts the rainwater regulation strategy based on the rainstorm water management model, and designs a set of rainwater runoff regulation system by monitoring the amount of water, collecting rainfall data, and evaluating the quality of rainwater and natural rainwater, aiming at conserving groundwater, restoring hydrological cycle, reducing urban waterlogging, and optimizing rainwater resources. In the implementation method, the effectiveness of this strategy is evaluated by simulating various scenarios such as without LID facilities, with LID facilities, and secondary rainwater pipe network regulation. The results showed that the Nash efficiency coefficient of the overall model was 0.89, and the changes in chemical oxygen demand, total nitrogen, and total phosphorus water quality indicators were very close to the actual monitoring results. The comparative data before and after the renovation showed that the three water quality indicators were much higher before the renovation. The peak flow rate and outflow time significantly decreased, for example, the peak flow rate decreased from 0.41 m³/s to 0.39 m³/s. The outflow time was reduced from 9 minutes to 6 minutes. It can be seen that the strategies proposed in the study have effectively improved the quality of urban environment and residents' lives, providing important reference basis for urban rainwater management and water resource protection.
Lin Zhu (Thu,) studied this question.