A trapezoidal canal section in alluvial soil with side slopes z:1 (H:V) and designed by Lacey theory generally has side slopes of:
Choose the correct answer
1:1 (45 degrees)
0.5:1 (steep)
1.5:1 (for cohesive soils up to 2:1 for sandy soils)
3:1 for all types
Correct Answer
C. 1.5:1 (for cohesive soils up to 2:1 for sandy soils)
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Side slopes depend on soil: Sandy loose soil: 2:1 to 3:1 (H:V); loamy soil: 1.5:1; stiff clay: 1:1; hard material: 0.5:1 to 0:1. Lacey theory does not fix side slopes; these are chosen based on soil stability and Kennedy/Lacey velocity then checked.
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