Use Equation 4.19:
3/2
3/2
D90
1/ 6
Q
qB = 4.780 10.846 b
y o S f - 0.627 Dm
Q
n
b
From Equation 4.21:
2/3
5.98 .06
3/2
1 -
nb = (.04) 1 +
= 0.038
60.96 .04
From Equation 4.23:
Qb
1
= 0.84
=
1.5
Q
5.98 0.06
1+
60.96 0.038
3/2
3/2
2.8
1/ 6
(2.99) (.0005) - 0.627 (2.01)
qB = 4.780 10.846 (0.84)
0.038
qB = 5.65 metric-tons/day/m
Qs = 5.65 x 60.96 = 344 metric-tons/day
4.12.4 Problem 3 Application of the Einstein Method to Calculate
Total Bed-Material Discharge
The application of the Einstein method to calculate total bed material discharge is given in
English units only. See Example Problem 4.13.4. The example is taken from Einstein's
1950 publication.
4.12.5 Problem 4 Calculation of Total Bed-Material Discharge
Using Colby's Method
The application of Colby method to calculate total bed-material discharge is given in English
units only. See Example Problem 4.13.5. The example problem uses the hydraulic and
sediment data given by Einstein for the purpose of comparison of the two methods.
The Colby method is easy to use. Organizations using SI units are encouraged to convert the
input variables to English units, solve the problem, and convert the results back to SI units.
4.39
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