**5. Conclusions**

The waterlogging problem in historic districts is a systemic problem. We should coordinate the technical aspects of waterlogging prevention and control systems such as the "Major-Minor-Micro" drainage system and the joint flood control system. At the same time, it is necessary to clarify the problems existing in the managemen<sup>t</sup> of the waterlogging prevention and control system, and improve the effectiveness of the waterlogging prevention and control system in the historic districts from the perspective of the entire system.


nization and work process should be optimized. We should establish a consultation and consultation mechanism, create a good communication platform, strengthen process control and supervision, implement process acceptance and control, and improve the comprehensive managemen<sup>t</sup> ability of waterlogging prevention and control in historic districts.

**Author Contributions:** Methodology: J.L. and S.S.; literature review: S.S. and L.L.; drawing and modifying diagrams: S.S. and Y.W.; validation: L.L. and Y.W.; writing—original draft preparation; S.S. and J.L.; writing—review and editing: J.L. and S.S. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was supported by ECERC and was funded by the key project of Beijing Municipal Natural Science Foundation, China, gran<sup>t</sup> number (8191001).

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** No new data were created or analyzed in this study. Data sharing is not applicable to this article.

**Conflicts of Interest:** The authors do not have any commercial or associative interests that represent conflicts of interest in connection with the submitted work.
