Figure 5.31 Relationship Between Side Slope and K (from Lane, 1953b)

Figure 5.29 Maximum Unit Tractive Force Versus b/d (from Simons and Sentrk, 1992), b is the Bottom Width and d is the Depth

Figure 5.32 Variation of Tractive Force With Bed Material d (from Lane, 1953a)

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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.

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