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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 - 2017
Question C-1
The accompanying map, located on the back page of Section A, shows ground contours at five metre vertical intervals. (a) On the drawing supplied, draw a vertical se... 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 - 2017
Step 1
On the drawing supplied, draw a vertical section (profile) on the line AB.
Answer
To draw the vertical section along line AB, measure the heights from the ground contour map. Start by identifying the contour lines intersecting line AB and taking note of their respective heights. Draw horizontal lines corresponding to each of these heights on a vertical axis, ensuring to maintain a scale of 1:1000. Finally, project these heights onto the vertical section to create the profile.
Step 2
Draw the plan and elevation of the triangle CDE.
Answer
To draw the plan of triangle CDE, start by locating points C, D, and E on the map. Connect these points to form the triangle while ensuring that the outlines correspond to the contouring. Next, to create the elevation of triangle CDE, project the heights of C, D, and E from their respective contour lines onto the elevation view. Indicate the vertices of the triangle with clear labels and represent the elevation accurately.
Step 3
Determine the strike and dip of the stratum.
Answer
To determine the strike of the stratum, draw the horizontal line in elevation that represents the bedding plane. Measure the angle between this line and the north direction to establish the strike direction. For the dip, identify the angle at which the stratum descends from the horizontal plane, taking measurements from two distinct heights for accuracy. This involves observing the edge view and using appropriate graphical methods to convey the dip angle accurately.