Side slopes generally kept for canals in loam soil, are: A. 1 : 1 in cutting and $$1\frac{1}{2}$$ : 1 in filling B. $$1\frac{1}{2}$$ : 1 in cutting and 2 : 1 in filling C. Neither (A) nor (B) D. Both (A) and (B)

The correct answer is: D. Both (A) and (B)

The side slopes generally kept for canals in loam soil are 1:1 in cutting and 1.5:1 in filling. This means that for every 1 foot of depth of excavation, the side slope should be 1 foot horizontally for 1 foot vertically in cutting, and 1.5 feet horizontally for 1 foot vertically in filling.

The reason for this is that loam soil is a relatively stable soil type, and these side slopes are sufficient to prevent erosion. In addition, these side slopes are relatively easy to construct and maintain.

If the side slopes were steeper, there would be a greater risk of erosion. If the side slopes were less steep, they would be more difficult to construct and maintain.

Therefore, the side slopes generally kept for canals in loam soil are 1:1 in cutting and 1.5:1 in filling.