Greater Dambulla Water Supply Projects

Greater Dambulla Water Supply Project is a large-scale water supply project which is having a capacity of 65 MLD with its two stages of construction. During this project, we have constructed the 1st stage of the plant constructions with a treatment capacity of 32 MLD and the Intake well and pumping station construction with a capacity of 65 MLD.

The raw water for the treatment was taken from the Ibbankattuwa Reservoir outfall canal. And the Intake well was located about 1 km away from the treatment plant.

I had the opportunity to join this project in the early stage of construction as the Civil Engineer In charge of the Intake and Water treatment plant construction. During my joining time, the Intake well excavation was finished up to 90% and finally, a weathered rock excavation was done, during my time of work.

In the treatment plant construction, the excavation and the screed concrete of the Filter Backwash tank and the sludge thickeners were done when I am joining this project. A base raft of the Rapid Mixing chambers, Flocculators, and the Lamella clarifier was completed when I was joining this project.

My responsibilities in this project as the Site Engineer of Sub-Contractor were as follows,

  1. Checking the setting out of the structures with respect to the drawings.
  2. Checking the excavation levels and ensuring that proper levels are maintained during the screed concreting.
  3. Preparing Bar Schedules as per the drawings and overall supervision of the bar bending and fixing works through the Foreman.
  4. Preparing the shop drawings for the Carpentry foreman and checking the alignment of the formworks after installation at the location.
  5. Inspecting the overall works with reference to the approved FC drawings and doing corrections prior to the client inspection.
  6. Inspecting the work with the client, prior to starting the concreting activities.
  7. Ordering the concrete with volume calculations and preparing the site for the concrete placing.
  8.  Maintaining the overall quality control of the concrete placing, compacting, leveling, and finishing.
  9. Checking the drawings in advance and raising RFINs to the Main contractor for the clearance of the details.
  10.  Preparing Method Statements for each work activity for approval from the Client and the Main Contractor.
  11. Preparing DPR daily to submit to the Main contractor.
  12. Raising RFIs for the inspections to be carried out in the next day to the Main Contractor.
  13. Collecting all the details from the subordinates and calculating the Cost and profit for each day work activities.
  14. Attending to Internal Meetings with Project Manager and Site Manager
  15. Attending to the Meetings with Main Contractor.
  16. Planning daily tasks as per the work program to achieve the monthly targets.
  17. Giving details to the QS team to prepare the monthly bill.