Knin Wastewater Treatment Plant, Croatia

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    Water

    This project consisted of the supervision of two separate IPA Contracts, involving rehabilitation, upgrading, and extension of the water supply and sewerage networks (Networks), and a new wastewater treatment plant (WWTP) in the town of Knin Croatia, for a population equivalent of 20,000 (Phase I), which expansion potential to 25,000PE (Phase II).

    Our role was construction supervision of the two contracts and included design review of the WWTP contract submissions. We were the FIDIC Engineer required to implement the contract, approve payment certificates, assess claims, and provide assistance with DAB procedure.

    Significant additional geotechnical works were undertaken due to the extremely poor ground conditions. The scope of the WWTP contract was extended to include for the design and installation of ground stabilisation works and ongoing monitoring of settlement. Additional structural interventions were also carried out due to the poor ground conditions.

    Similar issues were encountered with ground conditions on the Network contract and additional repairs and rehabilitation works were carried out. The Works Contracts were implemented under the FIDIC General Conditions of Contract - the “Red Book” for the networks contract, and the “Yellow Book” for the WWTP contract.

    The project included a new 20,000PE WWTP including sludge thickening and dewatering, construction of 23km of watermains and 19km of sewers, construction of a booster pumping station (PS) for the water supply network and four PS on the sewer network, quality control of all of the two Works Contractor’s operations, measurement of the completed works, assessment of claims and certification of all payments and preparation of final accounts/completion reports.

    Both projects are complete and the WWTP is within the 3-year Defects Notification Period, whilst the Performance Certificate has been issued for the Network contract.

    Key features of this contract include:

    • 20,000PE Water Treatment Plant
    • 23km of watermains
    • 19km of sewers
    Client: Hrvatske Vode (Croatian Water)
    Location: Knin, Croatia
    Value:

    €18 Million