Question

Given below are five statements about land levelling design:
(A) The plan inspection method of land levelling design is adapted for moderate to flat land slopes.
(B) The profile method of land levelling design consists of plotting the profiles of the grid lines and then laying the desired grade on the profiles.
(C) The contour adjustment method of land levelling design consists of a trial and error adjustment of the contour lines on a plan map.
(D) The contour adjustment method is especially adapted to the smoothening of flat lands that are to be irrigated.
(E) The plane method is rarely used for land levelling design.
Choose the correct answer from the options given below:

• A. (C), (D) and (E) only.
• B. (B), (C) and (D) only.
• C. (A), (B) and (C) only.
• D. (A), (B) and (E) only.

Hint:

Match each method (plan inspection, profile, contour adjustment, plane) to the terrain it is actually meant for.

Answer 1

The Correct Option is C

Step 1: Statement (A) is correct: the plan inspection method is a quick, simple approach suited to fields that are already fairly flat or have only moderate slope.
Step 2: Statement (B) is correct: the profile method literally plots ground profiles along the grid lines and then fits the required grade onto those profiles.
Step 3: Statement (C) is correct: the contour adjustment method works by trial and error shifting of the contour lines drawn on the plan.
Step 4: Statement (D) is incorrect as stated: the contour adjustment method is meant for fields with appreciable, uneven or undulating topography, not specifically for smoothening already flat land.
Step 5: Statement (E) is incorrect: the plane method (fitting a single best fit plane to the field elevations) is actually one of the more commonly applied methods, not a rarely used one.
So the correct statements are (A), (B) and (C) only, option 3.