Photo AI
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. (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 - 2011
Step 1
Draw a vertical section (profile) on the line AB
Answer
- Measure the heights at various points along line AB using the provided contour map.
- Draw horizontal lines corresponding to the measured heights at intervals of 5 metres.
- Project the intersection points between the horizontal lines and the contours to establish the profile outline for line AB.
Step 2
Draw a line on the profile to indicate the surface of the water when it is 8 metres in depth
Answer
- Identify the lowest point of the valley from part (b).
- From the lowest point, measure vertically upwards 8 metres to represent the water level during heavy rainfall.
- Draw a horizontal line across the profile at this 8-metre mark.
Step 3
Using side slopes of 1 in 1 for the cuttings, complete the earthworks on the northern side, necessary to accommodate the roadway
Answer
- Locate the centreline CD of the proposed roadway at an altitude of 25 metres.
- From the centreline, project lines outward at a slope of 1:1 for the earthwork cuttings, ensuring that the profile remains above the flood level.
- Identify and label the curvature of the earthworks adjusting for the changing ground levels as indicated on the contour lines.