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The accompanying map, located on the back page of Section A, shows ground contours at five metre vertical intervals on a proposed ski run - Leaving Cert DCG - Question C-1 - 2017

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Question C-1

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The accompanying map, located on the back page of Section A, shows ground contours at five metre vertical intervals on a proposed ski run. On the map, ABCD is the c... 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 on a proposed ski run - Leaving Cert DCG - Question C-1 - 2017

Step 1

Earthworks between A and B (Level)

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114 rated

Answer

  1. Draw parallel lines at 7.5m intervals across the section from A to B to delineate the earthworks cutting. This represents the level portion of the ski run, which is at 65m altitude.
  2. Identify intersections with contours and draw curve for the excavated area.

Step 2

Earthworks between B and C (Falling)

99%

104 rated

Answer

  1. Draw required 22.5m arc at edge of ski run at C (perpendicular). This shows the downward slope at B to C decreasing from 65m to 50m altitude.
  2. Draw parallel lines at 7.5m intervals to represent this falling cut.
  3. Identify intersections with contours and draw curve showing how slope transitions.

Step 3

Earthworks between C and D (Level, widened portion)

96%

101 rated

Answer

  1. Draw parallel lines at 10m intervals to represent the level part of the run from C to D, indicating cutting and widening towards the north.
  2. Identify intersections with contours and draw curve to depict earthworks.

Step 4

Profile through ski run/piste and maximum height of cable

98%

120 rated

Answer

  1. Using the points from the plan (E and F), establish heights and draw a vertical profile showing the ski run from E to F with respective heights.
  2. Draw towers at E and F showing the heights of 15m and 20m respectively, indicating maximum height above ground.
  3. Draw cable and examine the vertical distance with respect to the ground at E and F to determine max vertical distance.

Step 5

Strike and Dip of stratum

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117 rated

Answer

  1. Establish points P, Q and R in elevation and draw the required triangle. P is at 50m, Q at 35m and R the intersection of the skew borehole reaching 25m.
  2. Draw required triangle in plan and establish Strike Line, S, where the triangle meets the horizontal.
  3. Establish required Dip by finding angles and inclinations to define the slope of the stratum.

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