Urban suitable water surface rate determination method and system based on storage and drainage balance and medium

The invention discloses an urban suitable water surface rate determination method and system based on storage and drainage balance and a medium, and belongs to the crossing field of urban inland inundation prevention and control and hydraulic model technologies. The method comprises the following steps: S100, determining a waterlogging prevention and control standard, a tide level recurrence period and a research area feature elevation; s200, carrying out model generalization, wherein the model generalization comprises research area generalization, river channel generalization, regulation and storage water body generalization and drainage mode generalization; s300, setting boundary conditions and model parameters, and operating the model after the model parameters are set; s400, performing model result analysis, if the difference value between the feature elevation of the research area and the simulated highest water level in the river channel meets the preset specification requirement, performing the step S5