Developing Sediment Yield Prediction Equations for Small Catchments in Tanzania - Advances in Data, Methods, Models and Their Applications in Geoscience - page 253

correlation increases substantially with log-transformation of selected data set, i.e ., from R 2
equal to 0.037 to 0.665.

R² = 0.037

2500

2000

1500

1000

500

0

0 5 10 15 20 25 30

Catchment area (km 2 )

Fig. 3.1. (a) Scatter diagram of Sediment Yield-Fill in m 3 /year against catchment area in km 2
for dry climatic zone.

1.6

R² = 0.665

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

2.8 3 3.2 3.4

Log (Catchment area)

Fig. 3.1. (b) Scatter diagram of log-tranformed values of sediment yield-fill and catchment
area for dry climatic zone

3.2 Developed sediment yield prediction equations
Sample regression analysis result for dry climatic zone is presented in Tables 3.2.1 & 3.2.2
below: