Due to the limited area of green space, the area required for the CE-SG scenario exceeds the available area of the site, so this scenario cannot be achieved. The peak flow of other scenarios under different rainfall return periods is shown in Table 8, and the peak flow reduction rate is shown in Figure 3.
Table 8
Simulation results of single LID facility scheme
| Rainfall return period (a) | Pre-development | Post-development | |||||||
|---|---|---|---|---|---|---|---|---|---|
| CE-BP | CE-IP | CE-RE | DE-SG | DE-BP | DE-IP | DE-RE | |||
| Peak flow | 1a | 19.19 | 3.33 | 4.4 | 5.09 | 1.86 | 2.36 | 2.64 | 2.07 |
| 2a | 23.96 | 3.77 | 5.1 | 6.09 | 2.67 | 2.75 | 4.11 | 2.63 | |
| 3a | 26.91 | 4.06 | 5.5 | 6.69 | 3.09 | 2.94 | 6.04 | 2.96 | |
| 5a | 30.77 | 4.46 | 6.37 | 7.46 | 3.54 | 3.07 | 7.67 | 3.39 | |
| 10a | 36.2 | 5.02 | 9.51 | 8.53 | 3.97 | 3.3 | 9.96 | 3.98 | |
| 20a | 41.83 | 5.6 | 13.4 | 9.66 | 4.46 | 3.56 | 12.68 | 4.55 | |
| Rainfall return period (a) | Pre-development | Post-development | |||||||
|---|---|---|---|---|---|---|---|---|---|
| CE-BP | CE-IP | CE-RE | DE-SG | DE-BP | DE-IP | DE-RE | |||
| Peak flow | 1a | 19.19 | 3.33 | 4.4 | 5.09 | 1.86 | 2.36 | 2.64 | 2.07 |
| 2a | 23.96 | 3.77 | 5.1 | 6.09 | 2.67 | 2.75 | 4.11 | 2.63 | |
| 3a | 26.91 | 4.06 | 5.5 | 6.69 | 3.09 | 2.94 | 6.04 | 2.96 | |
| 5a | 30.77 | 4.46 | 6.37 | 7.46 | 3.54 | 3.07 | 7.67 | 3.39 | |
| 10a | 36.2 | 5.02 | 9.51 | 8.53 | 3.97 | 3.3 | 9.96 | 3.98 | |
| 20a | 41.83 | 5.6 | 13.4 | 9.66 | 4.46 | 3.56 | 12.68 | 4.55 | |
Figure 3
Flood peak flux reduction rate of single LID facility scheme.