Environmental Engineering Reference
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11.0
10.5
10.0
9.5
9.0
0
2000
4000
6000
8000
10000
Figure 7.7. Changes in the bed
level from the original bed level
after 30, 60 and 90 days
according to Brownlie's
predictor.
Distance (m)
Initial bed
Bed at 30 days
Bed at 60 days
Bed at 90 days
Table 7.4. Total amount of sediment deposition as a function of the relative sediment
diameter according to Brownlie's sediment predictor.
Sediment diameter (mm)
0.150
0.200
0.250
Relative sediment diameter
1
1.33
1.66
Total volume of sedimentation (m
3
)
0
2 292
4 229
and for a design flow of 25.75 m
3
/s. Deviation from the design diam-
eter (
d
0.150 mm) for the equilibrium concentration according to
Brownlie (108 ppm) results in relatively more deposition in the entire
canal (Figure 7.8).
=
0.60
0.50
0.40
0.30
0.20
0.10
0.00
Figure 7.8. Relative sediment
deposition after 90 days as a
function of the variation in the
relative concentration and for the
three predictors.
1.50
0.00
2.00
Relative concentration
A-W
Br
E-H
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