Part 1: Vertical control
As part of the pre-design information required for the re-development of the K- block within the University of South Wales’s Treforest campus, some surveying activities are needed to be implemented around the development site. The survey activities involve a closed levelling survey, where reduced levels are required for various observation/stake points as indicated below and shown in Appendix 1.
Point A – Top of drain cover 1 Point B – Top of RC wall Point C – Top of drain cover 2 Point D – Top of pavement Point E – Top of bottom stairs Point F – Top of drain cover 3 Point G – Top of drain cover 4 Point H – Top of corner kerb Point I – Top of drain cover 5
The reduced level for the Temporary benchmark (TBM) was identified as 69.650m.
a) Using the rise and fall method sheet in Appendix 2, conduct a levelling survey of the identified observation/stake points around the development site (Refer to practical survey Risk Assessment in Appendix 4).
b) Record the data obtained from the various line of sights (intermediate sights and fore sights) in your booking sheet.
c) Evaluate the Reduced Levels (RL) on the booking sheet and carry out the mathematical check.
d) Verify the accuracy of the levelling survey and comment accordingly.
e) Produce a sketch of the vertical section along the line of levelling survey and explain the process/procedures you have taken to accurately carry out the levelling survey (Note: the sketch should not be hand-drawn but produced with applications such as CAD, Excel etc.).
Part 2: Horizontal control
Using a Total station, the horizontal angular measurement of some identified target points are required to be taken from specific station positions within the K-block site (Refer to practical survey Risk Assessment in Appendix 4).
a) Record the horizontal circle readings for the target points in the booking sheet shown in Appendix 3.
b) Determine the mean horizontal circle readings for the identified target points from your allocated instrument position.
c) Evaluate the mean horizontal angles for the target points.
d) Describe with annotated sketches the process you obtained the horizontal angular measurements on-site using a Total Station from your allocated instrument position.
