Table 2.
Relative (%) and absolute sediment contributions (t km−2 year−1) weighted per source area and catchment area for tracks included and excluded of the sediment apportionment within a smallholder agriculture catchment in the Sondu Basin of Kenya.
| Scenario | Sources | Surface area km2 | Relative contribution % | Absolute contribution per source area t km−2 year−1 | Absolute contribution per catchment area t km−2 year−1 |
|---|---|---|---|---|---|
| Scenario 1 (tracks included) | Agricultural land | 25.7 | 75 (63–86) | 85 (71–97) | 80 (67–91) |
| Gullies | 0.1 | 1 (0–4) | 567 (0–2,268) | 1 (0–4) | |
| Channel banks | 0.1 | 21 (8–32) | 6,073 (2,314–9,254) | 22 (8–34) | |
| Tracks | 0.6 | 3 (0–12) | 150 (0–598) | 3 (0–13) | |
| Scenario 2 (tracks excluded) | Agricultural land | 26.8 | 77 (67–87) | 83 (72–94) | 82 (71–92) |
| Gullies | 0.1 | 1 (0–4) | 567 (0–2,268) | 1 (0–4) | |
| Channel banks | 0.1 | 22 (11–33) | 6,362 (3,181–9,544) | 23 (12–35) |
In brackets 95% confidence interval.