The presented study looks to assess compound flood hazards in Shanghai from rainfall and storm surge events using a statistical dependence model for compound event definition and a hydrodynamic model to represent inundation. The authors in particular look at the sensitivity of inundation to the timing of storm surge peaks and rainfall, which is valuable information for flood risk management. The study is well organized and the objectives are clearly defined and well addressed. I do have a number of relatively minor issues that should be addressed before the paper is published. Please find them below:

• Add quantitive results to Abstract.
• “TC” events, tropical cyclone acronym should be spelt out the first time
• Paragraph starting line 67 is missing some references. The example provided line 71, are the authors saying this is something that can happen in theory, or that has been documented to happen in the case study area (reference?).
• Line 135. A little more detail on what is meant by a “local typical storm surge pattern and rainfall hyetograph” would be beneficial. What is a typical storm and how is it defined?
  • a follow up remark is that total sea level during a surge is refrerred to as “storm surge” in the paper, including in the result figures. How are tides considered in this study? Is the surge residual set at high tide?

• Bilskie and Hagen (2018) defines zones as “coastal”, “hydrologic” and “transition”. The use of the term “fluvial” here to refer to surge-induced only might be misleading as fluvial flooding in its typical definition can be rainfall-induced. Unless a clearer explanation is provided, “Tidal zone” or “coastal zone” might be more accurate. Jumping forward, the Bilskie and Hagen terminology is used in Figure 7 so there needs to be consistency on this throughout the paper.
• How was the hydrodynamic model calibrated and validated? I could not find Ke et al. (2021) in the references.
• Figure 6 b and d, add scale and north arrow.
• Line 229: “represented by red” in Figure 7?
• While the discussions provide insights on the study’s limitations and its wider implications on flood mitigation, there is a lack of references to past studies that have looked at flooding risk in Shanghai and how the author’s findings relate to them.

1 please add protection information along the Huangpu River and coastlines.

2 There is little inundation along the coastline, is it because of coastal protection?

3 Line 155-160, the description of how to develop a flood inundation model looks quite simple, but it is a complicated process and did not describe how to validate. I suggest adding more information here, at least, to put some information in the supplementary.