Table 4.7. Bed Material Information for Sample Problem.
Grain Size
Average Grain Size
Settling Velocity
Distribution, mm
mm
ft
%
mm/sec
fps
D > 0.589
--
--
2.4
--
--
0.589 > D > 0.417
0.495
0.00162
17.8
5.20
0.195
0.417 > D > 0.295
0.351
0.00115
40.2
3.75
0.148
0.295 > D > 0.208
0.248
0.00081
32.0
2.70
0.100
0.208 > D > 0.147
0.175
0.00057
5.8
1.70
0.064
0.147 > D
--
--
1.8
--
--
Hydraulic Calculations
The important hydraulic parameters were calculated, as given in Table 4.8. The table
headings, their meanings and calculations are explained after the table. In the calculations,
Equation 4.42 and Figure 4.7 were used to evaluate the resistance to flow. Any similar
relation discussed in Chapter 2 can be utilized for the same purposes.
Bed-Material Discharge Calculations
The bed-material transport is calculated for each representative grain size of the bed material
at each given flow depth. The procedure and results are given in Table 4.9, see the notes
section for explanation of symbols, column by column.
Figure 4.19. Description of the average cross section.
4.45
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