Fundamentals of Engineering Design
Figure 5.31 Relationship Between Side Slope and K (from Lane, 1953b)
Determine the value of , tractive force, corresponding to the d75 from Figure 5.32.
Based on bed conditions estimate the maximum permissible longitudinal slope by equating the
value of taken from Figure 5.32 to C D So and solve for So in the form:
The influence of the stability of the canal sides on channel slope So must now be checked.
Usually, the side material cannot resist as great a tractive force as the bed because of the
additional effect of gravity.
Knowing size and shape of material, enter Figure 5.33 and estimate the angle of repose.