Question

# Q3.Table overleaf (Q3) indicates a levelling survey carried out to establish existing ground levels along the...

Q3.Table overleaf (Q3) indicates a levelling survey carried out to establish existing ground levels along the centre line of a proposed road.

1. Determine the reduced levels using the height of plane of collimation (HPC) method.

1. Find misclosure (if any) and carry out the usual mathematical checks to determine if this misclosure is due to errors in computation.

1. Distribute the actual misclosure and obtain the corrected reduced levels.

Bonus :

1. Using paper provided to you, sketch the longitudinal section along the existing ground profile from chainage 0 – 100 m.

1. Assuming that the level of the proposed road centre line to be sloping 2% upwards from chainage 0 at an elevation of 77.000 m, plot the proposed road on your sketch and clearly indicate where CUTS and FILLS are required.

 Back sight (m) Intermediate sight (m) Fore sight (m) HPC (m) Reducel Level (m) Correction (m) Corrected RL   (m) Remarks 1.011 TBM1 = 78.000 m 1.938 Chainage point 0 m 2.701 Chainage point 10 m 4.587 1.492 Change Point 0.906 Chainage point 20 m 2.010 Chainage point 30 m 3.242 Chainage point 40 m 1.412 2.757 Change Point 2.220 Chainage point 50 m 3.018 1.212 Change Point 0.211 Chainage point 60 m 0.786 Chainage point 70 m 1.806 Chainage point 80 m 2.879 Chainage point 90 m 3.584 Chainage point 100 m 4.016 TBM2 = 78.560 m

#### Earn Coins

Coins can be redeemed for fabulous gifts.