Table 1.
REO tagged sediment balance within the three SuDS networks
| Monitoring period | Release | Week 2 | Week 8 | Week 16 | Week 24 | Week 32 | Week 40 | Week 48 | Week 52 |
|---|---|---|---|---|---|---|---|---|---|
| Roof | |||||||||
| Cumulative mass detained in system (%) | 99.9 | 99.9 | 99.9 | 99.8 | 99.7 | 99.1 | 99.1 | 98.4 | |
| Cumulative detention in system (g) | 600 | 3246 | 4296 | 4892 | 4983 | 4951 | 4955 | 4921 | |
| Remaining release on urban surface (g) | 5000 | 3400 | 1750 | 700 | 100 | 0 | 0 | 0 | 0 |
| Of which | |||||||||
| Suspended total at time of sampling (g) | 273 | 77 | 6 | 0.1 | 2 | 27 | 14 | 4 | |
| Deposition due to resuspension (g) | 12 | 1020 | 1102 | 839 | 889 | 929 | 1491 | 318 | |
| Car park | |||||||||
| Cumulative mass detained in system (%) | 99.9 | 99.9 | 99.9 | 99.7 | 99.7 | 99.2 | 97.5 | 97.0 | |
| Cumulative detention in system (g) | 2937 | 11,543 | 17,831 | 20,305 | 19,886 | 20,481 | 20,372 | 18,180 | |
| Remaining release on urban surface (g) | 21,000 | 18,606 | 9450 | 3150 | 2100 | 1050 | 315 | 0 | 0 |
| Of which | |||||||||
| Suspended total at time of sampling (g) | 106 | 159 | 0.04 | 0.2 | 0.3 | 189 | 88 | 72 | |
| Deposition due to resuspension (g) | 0 | 0 | 0 | 1301 | 91 | 481 | 344 | 105 | |
| Road | |||||||||
| Cumulative mass detained in system (%) | 96.5 | 89.7 | 91.9 | 91.6 | 89.6 | 88.1 | 84.6 | 83.5 | |
| Cumulative detention in system (g) | 868 | 3229 | 5055 | 5441 | 5376 | 5283 | 5074 | 5012 | |
| Remaining release on urban surface (g) | 6000 | 4200 | 1560 | 300 | 7 | 0 | 0 | 0 | 0 |
| Of which | |||||||||
| Suspended total at time of sampling (g) | 450 | 179 | 8 | 7 | 13 | 48 | 17 | 16 | |
| Deposition due to resuspension (g) | 66 | 2389 | 477 | 691 | 688 | 499 | 824 | 124 | |
The values are presented as grams and percentages of tagged sediment within the SuDS network
Average material lost to sample activities is 0.34 kg/year, SD 0.31