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Question 12

Using the table below, calculate the mean annual suspended sediment yield for the river basin from 1980 to 2020.

Table 1: River Basin Suspended Sediment Yield (1980−20201980-20201980−2020)

YearSuspended Sediment Yield (t km−2 yr−1\text{t km}^{-2}\text{ yr}^{-1}t km−2 yr−1)
1980124.5
1990138.2
2000112.8
2010145.6
2020160.9
A

130.3 t km−2 yr−1130.3\text{ t km}^{-2}\text{ yr}^{-1}130.3 t km−2 yr−1

B

136.4 t km−2 yr−1136.4\text{ t km}^{-2}\text{ yr}^{-1}136.4 t km−2 yr−1

C

138.2 t km−2 yr−1138.2\text{ t km}^{-2}\text{ yr}^{-1}138.2 t km−2 yr−1

D

170.5 t km−2 yr−1170.5\text{ t km}^{-2}\text{ yr}^{-1}170.5 t km−2 yr−1

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