The waterlogging risk map adopts the water depth map under the return period of five-year rainfall, as shown in Figure 7. Integrating the ponding depth, land use type, and building damage characteristics determines the initial construction point of LID facilities as shown in Figure 8. This study took the three construction initial points as the construction center and successively added various LID facilities to the outer boundary until getting the maximum constructable boundary. For capturing the relationship between the construction area of LID facilities and the construction effect accurately, according to the layout method of LID facilities in section 2.3.2, increased the area of two LID facilities five times successively, and finally got six groups of simulation results for each single facility of pervious pavement and rainwater garden, as well as 36 groups of simulation results for the combined LID facilities, as shown in Table 3.