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.

Table 3

Case number . | Pervious pavement area (m^{2})
. | Rainwater garden area (m^{2})
. | Peak ponding reduction (m^{3})
. | Case number . | Pervious pavement area (m^{2})
. | Rainwater garden area (m^{2})
. | Peak ponding reduction (m^{3})
. |
---|---|---|---|---|---|---|---|

Case 1 | 19,012 | 0 | 433.6 | Case 19 | 107,591 | 109,955 | 2,265.5 |

Case 2 | 19,012 | 30,588 | 678.1 | Case 20 | 164,091 | 0 | 2,124.8 |

Case 3 | 0 | 30,588 | 316.2 | Case 21 | 164,091 | 30,588 | 2,368.5 |

Case 4 | 39,787 | 0 | 858 | Case 22 | 164,091 | 90,411 | 2,697.7 |

Case 5 | 39,787 | 30,588 | 1,101 | Case 23 | 164,091 | 109,893 | 2,725 |

Case 6 | 39,787 | 90,411 | 1,431.6 | Case 24 | 164,091 | 117,184 | 2,742.3 |

Case 7 | 107,591 | 0 | 1,665.3 | Case 25 | 225,622 | 0 | 2,796.8 |

Case 8 | 107,591 | 30,588 | 1,908.8 | Case 26 | 225,622 | 30,588 | 3,041.3 |

Case 9 | 107,591 | 90,411 | 2,238 | Case 27 | 225,622 | 90,411 | 3,371.1 |

Case 10 | 225,622 | 109,893 | 3,398.3 | Case 28 | 19,012 | 109,955 | 1,238.9 |

Case 11 | 225,622 | 117,184 | 3,415.6 | Case 29 | 19,012 | 117,184 | 1,285.4 |

Case 12 | 225,622 | 135,175 | 3,443.4 | Case 30 | 39,787 | 109,893 | 1,532.1 |

Case 13 | 164,091 | 135,175 | 2,809.5 | Case 31 | 39,787 | 117,184 | 1,578.4 |

Case 14 | 107,591 | 135,175 | 2,380.8 | Case 32 | 107,591 | 117,184 | 2,310.5 |

Case 15 | 39,787 | 135,175 | 1,648.7 | Case 33 | 0 | 90,411 | 783.1 |

Case 16 | 19,012 | 135,175 | 1,355.7 | Case 34 | 0 | 109,955 | 886.5 |

Case 17 | 0 | 135,175 | 1,003.1 | Case 35 | 0 | 117,184 | 932.8 |

Case 18 | 19,012 | 90,411 | 1,138.5 | Case 36 | 0 | 0 | 0 |

Case number . | Pervious pavement area (m^{2})
. | Rainwater garden area (m^{2})
. | Peak ponding reduction (m^{3})
. | Case number . | Pervious pavement area (m^{2})
. | Rainwater garden area (m^{2})
. | Peak ponding reduction (m^{3})
. |
---|---|---|---|---|---|---|---|

Case 1 | 19,012 | 0 | 433.6 | Case 19 | 107,591 | 109,955 | 2,265.5 |

Case 2 | 19,012 | 30,588 | 678.1 | Case 20 | 164,091 | 0 | 2,124.8 |

Case 3 | 0 | 30,588 | 316.2 | Case 21 | 164,091 | 30,588 | 2,368.5 |

Case 4 | 39,787 | 0 | 858 | Case 22 | 164,091 | 90,411 | 2,697.7 |

Case 5 | 39,787 | 30,588 | 1,101 | Case 23 | 164,091 | 109,893 | 2,725 |

Case 6 | 39,787 | 90,411 | 1,431.6 | Case 24 | 164,091 | 117,184 | 2,742.3 |

Case 7 | 107,591 | 0 | 1,665.3 | Case 25 | 225,622 | 0 | 2,796.8 |

Case 8 | 107,591 | 30,588 | 1,908.8 | Case 26 | 225,622 | 30,588 | 3,041.3 |

Case 9 | 107,591 | 90,411 | 2,238 | Case 27 | 225,622 | 90,411 | 3,371.1 |

Case 10 | 225,622 | 109,893 | 3,398.3 | Case 28 | 19,012 | 109,955 | 1,238.9 |

Case 11 | 225,622 | 117,184 | 3,415.6 | Case 29 | 19,012 | 117,184 | 1,285.4 |

Case 12 | 225,622 | 135,175 | 3,443.4 | Case 30 | 39,787 | 109,893 | 1,532.1 |

Case 13 | 164,091 | 135,175 | 2,809.5 | Case 31 | 39,787 | 117,184 | 1,578.4 |

Case 14 | 107,591 | 135,175 | 2,380.8 | Case 32 | 107,591 | 117,184 | 2,310.5 |

Case 15 | 39,787 | 135,175 | 1,648.7 | Case 33 | 0 | 90,411 | 783.1 |

Case 16 | 19,012 | 135,175 | 1,355.7 | Case 34 | 0 | 109,955 | 886.5 |

Case 17 | 0 | 135,175 | 1,003.1 | Case 35 | 0 | 117,184 | 932.8 |

Case 18 | 19,012 | 90,411 | 1,138.5 | Case 36 | 0 | 0 | 0 |

Fig. 7

Fig. 8

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