This Contour Map is part of Section C and should be used for the answering of the Geologic Geometry Option (Question C-1) - Leaving Cert DCG - Question C-1 - 2011
Question C-1
This Contour Map is part of Section C and should be used for the answering of the Geologic Geometry Option (Question C-1).
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Worked Solution & Example Answer:This Contour Map is part of Section C and should be used for the answering of the Geologic Geometry Option (Question C-1) - Leaving Cert DCG - Question C-1 - 2011
Step 1
Draw parallel lines at 10m intervals.
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Answer
To draw parallel lines at 10m intervals between points A and B on the contour map, begin at point A and maintain the same elevation while marking parallel lines downward towards B. Use the contour intervals on the map to ensure the lines are accurate.
Step 2
Identify intersections with contours and draw curve.
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Answer
Examine where the parallel lines intersect with the contour lines on the map. Mark these intersection points clearly and connect them with a smooth curve to represent the embankment shape accurately.
Step 3
Draw parallel lines at 7.5m intervals.
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Answer
Similar to the first step, draw parallel lines between points A and B at 7.5m intervals. Ensure this is precise as it will help in establishing the cutting gradient.
Step 4
Identify intersections with contours and draw curve.
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Answer
Identify the new intersection points created between the 7.5m parallel lines and the contour lines. Connect these points with a smooth curve, representing where the cutting occurs.
Step 5
Draw arc(s) at 10m intervals.
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Answer
For the curved section between points B and C, create arcs at 10m intervals. Start from point B and use a compass or a similar tool to maintain the curvature as directed by the contour lines.
Step 6
Identify intersections with contours and draw curve.
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Answer
Locate the intersections created by the arcs with the contour lines and clearly mark these points. Connect these sequentially to depict the outline of the embankment visually.
Step 7
Draw required arc.
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Answer
When moving from point C to D, draw the required arc following the contour lines appropriately, ensuring the arc reflects the ground changes accurately.
Step 8
Draw parallel lines at 7.5m intervals.
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Answer
As with previous sections, draw parallel lines at 7.5m intervals in the area between C and D to set up for the cutting process.
Step 9
Identify intersections with contours and draw curve.
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Answer
Identify the intersections made by the 7.5m lines with the contour lines, and draw a smooth curve connecting these intersections to illustrate the cutting area.
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