Environmental Engineering Reference
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30 mg/L into a river. The suspended solids are
composed of predominantly silt particles, and the
river has a trapezoidal shape with a flow depth of
4 m, a bottom width of 6 m, and side slopes of 2:1
(H :v). The mean velocity in the river is 3 cm/s.
Distance (m)
velocity (m/s)
Depth (m)
0.00
0.00
0.00
2.13
0.03
0.55
5.18
0.16
1.28
8.23
0.30
1.28
(a) Estimate the distance from the outfall within
which most of the suspended particles are
deposited on the bottom.
(b) Estimate the rate at which sediment is accu-
mulating on the bottom within 500 m of the
outfall.
11.28
0.33
1.46
14.32
0.36
1.58
17.37
0.35
2.01
20.42
0.23
1.95
22.25
0.00
0.00
If the transverse diffusion coefficient in the stream
is 120 cm
2
is estimate the longitudinal dispersion
coefficient.
3.33.
Measurements of velocity and depth across a river
have been reported as follows:
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