Table 4.
Peak runoff and total runoff volume at the catchment outlet (O1) of UGI scenarios compared to modelling results without UGI implementation for the three considered rainfall events
| Rainfall event | Peak runoff at catchment outlet (m3/s) | Total runoff volume at catchment outlet (ML) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S1 | S2 | S1 | S2 | |||||||||||
| Without UGI | With UGI | % | No. of junctions flooding avoided | Without UGI | With UGI | % | No. of junctions flooding avoided | Without UGI | With UGI | % | Without UGI | With UGI | % | |
| 1 (4-month) | 114.4 | 84.1 | 26.5 | 6 | 114.406 | 114.4 | 0.0 | 0 | 8020 | 5030 | 37.3 | 8020 | 7650 | 4.6 |
| 2 (10-year) | 99.3 | 59.6 | 40.0 | 2 | 99.3 | 79.9 | 19.6 | 1 | 2010 | 1820 | 9.5 | 2010 | 2020 | − 0.5 |
| 3 (50-year) | 113.7 | 97.8 | 14.0 | 4 | 113.7 | 112.9 | 0.7 | 0 | 2320 | 2160 | 6.9 | 2320 | 2400 | − 3.4 |