Table 8 Variation of annual sediment retention rates with slope classes
Slope class (%) | Area | Estimated annual Sediment retention | |||
|---|---|---|---|---|---|
ha | % | t year−1 | Contribution to total sediment retention (%) | t ha−1 year−1 | |
0–5 | 77,187.8 | 54.1 | 1,230,643.7 | 6.6 | 15.9 |
5–15 | 41,819.1 | 29.3 | 5,407,373.6 | 29.0 | 129.3 |
15–30 | 17,147.2 | 12.0 | 6,115,926.0 | 32.8 | 356.3 |
30–50 | 5,590.6 | 3.9 | 4,642,882.9 | 24.9 | 830.5 |
> 50 | 916.3 | 0.6 | 1,249,289.8 | 6.8 | 1378.6 |
Total | 142,661.0 | 100.0 | 18,646,116.0 | 100 | Â |