Table 1 shows the sediment storage components in a headwater drainage basin.
Table 1: Sediment storage components in a headwater drainage basin
| Component | Sediment mass (tonnes) |
|---|---|
| Channel bed | 42 |
| Floodplain | 112 |
| Colluvial slopes | 70 |
| Channel bars | 16 |
Using Table 1, what percentage of the total sediment stored in the drainage basin is held in the channel bed?
17.5%17.5\%17.5%
18.8%18.8\%18.8%
37.5%37.5\%37.5%
42.0%42.0\%42.0%