The accompanying map, located on the back page of Section A, shows ground contours at five metre vertical intervals - Leaving Cert DCG - Question C-1. - 2011
Question C-1.
The accompanying map, located on the back page of Section A, shows ground contours at five metre vertical intervals.
ABCD is the centreline of a proposed roadway. O... show full transcript
Worked Solution & Example Answer:The accompanying map, located on the back page of Section A, shows ground contours at five metre vertical intervals - Leaving Cert DCG - Question C-1. - 2011
Step 1
the section of the roadway between A and B is level at an altitude of 70m
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Answer
Draw parallel lines at 10m intervals along the section from A to B to represent the earthworks.
Ensure that these lines remain parallel to indicate the level road profile.
Step 2
the section between B and C is also level at an altitude of 70m and is curved as shown
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Answer
Draw parallel lines at 10m intervals following the curvature from B to C.
Identify intersections with contour lines and ensure the road remains level at an altitude of 70m across this segment.
Step 3
the section from C to D has a gradient of 1 in 15 falling
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Answer
Draw lines at 7.5m intervals to illustrate the gradient from C to D.
Identify intersections with the contour and draw curves to represent the falling grade accurately.
Step 4
Complete the given construction to determine the strike line for the stratum.
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Answer
Identify points E, F, and G on the map as the outcrop points of the stratum.
Construct lines connecting these points to determine the strike line.
Step 5
Determine the dip of the stratum.
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Answer
Draw the perpendicular line from points on the strike line to visualize the dip.
Measure angles or slopes as necessary to determine the dip, ensuring to note it accurately on your diagram.
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