Civil Engineering - Surveying - Discussion

As in a hill or mountain on increasing the elevation horizontal intercept decreases or vice versa and we also know that the crown value of the contour (ice cream cone is upright in the case of the hill) comes in the centre.

So, now the contour interval with elevation is increasing but the width of the contour that is the horizontal intercept is decreasing so the highest value of the contour comes in the centre and the lowest value outside, Now try to understand the replica of a mountain or hill is depression or valley.

In the case of a valley the highest elevation is on ground level and elevation as well as horizontal intercept i.e width of the contour line decreases with increasing depth. So as per the rule discussed above crown level (cone of down ice cream in this case of valley) comes in the centre so the least value comes in the centre and the major value comes outside.

Thanks.

The Correct answer is a depression.

The centre of the depression is in a lower altitude and the sides of the valley in height. So the correct answer is B.

The right Answer is hill.

Well said, Thanks. @Saurabh Patankar.

Similar to a close counter line with one or more value lower inside then it represents a valley or depression.

Closed contours of decreasing value towards centre indicates a depression.

Closed contours of increasing value towards centre indicates a hill.

Closed contour lines with reducing levels towards the centre indicate pond or other depression.

Both B & A is correct according to me.

Option B is correct. I agree with the given answer.