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The accompanying map, located on the back page of Section A, shows ground contours at 5 metre vertical intervals - Leaving Cert DCG - Question C-1 - 2015
Question C-1
The accompanying map, located on the back page of Section A, shows ground contours at 5 metre vertical intervals. (a) On the drawing supplied, draw a vertical secti... show full transcript
Worked Solution & Example Answer:The accompanying map, located on the back page of Section A, shows ground contours at 5 metre vertical intervals - Leaving Cert DCG - Question C-1 - 2015
Step 1
On the drawing supplied, draw a vertical section (profile) on the line AB.
Answer
- Measure the heights of the contour lines along line AB using the provided contour map.
- Draw horizontal lines from these heights to establish reference points.
- Project these reference points downwards to form a vertical section, maintaining proportionality based on the scale of 1:1000.
- Ensure all lines are clearly labeled and consistent with the contour information.
Step 2
Determine the strike and dip of the stratum.
Answer
- Identify points C, D, and E and plot their coordinates on the map.
- Connect these outcrop points to define the orientation of the stratum.
- To find the strike, measure the angle of the line connecting these points with respect to true north.
- Establish the dip by calculating the angle of the stratum with reference to a horizontal plane, using the elevations of the points as necessary.
Step 3
In your auxiliary view, which shows the dip, draw the bottom surface of the stratum.
Answer
- Given the thickness of the stratum is 10 metres, calculate the elevation of the base by subtracting 10 m from the elevation of the top surface at points C, D, and E.
- Using the calculated base elevations, sketch the bottom surface of the stratum in the auxiliary view, ensuring it parallels the dip direction established in the previous part.
- Mark the base clearly, indicating layers and maintaining scale.