Hydrotechnical Facilities
We design water supply systems, wastewater and stormwater drainage systems, and external drainage with watercourse regulation. Our solutions merge technical reliability and environmental preservation to create long-term sustainable infrastructure.
City of Zagreb Central Wastewater Treatment Plant (CUPOV)
The construction scale of the City of Zagreb Central Wastewater Treatment Plant (CUPOV) was planned for a load of 1,200,000 PE. The CUPOV was built in two main phases. The first phase comprised the construction of the mechanical part of the plant (preliminary wastewater treatment) with a temporary discharge into the Main Drainage Canal (GOK).
In the second phase, the biological part of the plant and sludge treatment were added. Both phases of the CUPOV obtained use permits, and the plant was commissioned on 10/23/2008.
A building permit has been issued for the CUPOV upgrade to tertiary treatment for nitrogen and phosphorus removal.
CLIENT: City of Zagreb
New Passenger Terminal of “Zagreb – Franjo Tuđman” International Airport (MZLZ) with Access Roads and Infrastructure
Zagreb Airport is the main international airport in Croatia and one of the country’s primary gateways to Europe and the rest of the world.
To protect the environment and prevent infiltration of polluted water into the subsurface, a controlled, closed, watertight drainage and treatment system for all wastewater from the existing runway and from all other maneuvering and operational areas (new and old aprons, taxiways, etc.), as well as all airside and landside roads and parking lots, was built within the MZLZ area.
The complete drainage works included construction of pipelines with diameters 540–2400 mm in a total length of approx. 30 km; installation of separators, overflow structures, pumping stations with 7,000 l/s capacity; retention basins; tanks for aircraft de-icing chemicals (glycol tanks); and discharge from the clean-water retention to the Sava River and from the polluted-water retention to the City of Zagreb Central Wastewater Treatment Plant.
CLIENT: Zagreb International Airport
Jelsa–Vrboska and Stari Grad Agglomeration
The construction of the wastewater drainage system for the Jelsa–Vrboska and Stari Grad agglomeration, together with the public water supply system in the same area, was approved for co-financing under the Operational Program “Environmental Protection” for the period 2007–2013.
The main goals achieved through the agglomeration construction were: elimination of existing untreated discharges; protection of the recipient (the sea) from excessive pollution during rainy periods; provision of sufficient collector network capacity in both dry and wet seasons; reduction of infiltration of foreign waters into the subsurface; reduction of drinking water losses; and a reliable potable water supply, especially at peak demand, as well as optimization of the water supply system.
The project included the construction of sewerage and water supply networks with approx. 60 km of wastewater network, approx. 60 km of water supply network, 12 wastewater pumping stations, 1 potable water booster station, 18 drinking water metering and regulation chambers, and reconstruction within an existing reservoir.
Together with wastewater treatment plants (2 units), submarine outfalls (2 units), and access roads, the investment value was approx. EUR 73 million.
CLIENT: Investor: Hvarski vodovod d.o.o. Jelsa
Co-investors: EU Cohesion Fund, Hrvatske vode, Ministries (MRRFEU and MZOZT)
Partners: City of Stari Grad and Municipality of Jelsa
Water Supply of the Island of Hvar – Submarine Pipeline Brač–Hvar
By laying a submarine pipeline between Dugi Rat Beach on the island of Brač and Oskorušica Bay on the island of Hvar, the shortage of potable water during the summer season on Hvar was resolved.
The submarine pipeline has a diameter of 350 mm and a total length of 5,401.0 m. Transition chambers were built on both islands (Brač and Hvar) to connect the onshore and submarine pipelines, together with integration into the telemetry system of Hvar’s water supply network.
CLIENT: Hvarski vodovod d.o.o. Jelsa
Radovin–Jovići Water Supply System – “Jovići” Reservoir
The “Jovići” reservoir, volume V = 250 m³, with associated pipelines, is part of the Radovin–Jovići water supply system. The reservoir functions as a balancing tank to cover daily consumption fluctuations in the water supply system. The system is connected to the northern gravity pipeline—the regional Zrmanja–Zadar main—as part of the broader Zadar area water supply network.
CLIENT: Vodovod d.o.o. Zadar
“Kupinečki Kraljevec” Reservoir
The “Kupinečki Kraljevec” reservoir, with a capacity of 300 m³, is located in the elevation zone “Kupinečki Kraljevec – Donji Dragonožec.” Its construction enabled water supply and conveyance to surrounding settlements within the zone bounded by Lukšići, Markuševec Turopoljski, Donji Dragonožec, and Havdić Selo.
CLIENT: City of Zagreb
Civil-Mechanical Reconstruction of the “Jaruga I” Pumping Station
The pumping station is part of one of the oldest hydroelectric power plants for alternating current generation in the world. It was built below the Skradinski buk waterfall on the Krka River, today within Krka National Park, and it forms part of the Šibenik area water supply system.
The civil-mechanical reconstruction included, among other works, the installation of new pumping units, a new turbine, surge tanks for water hammer compensation, new equipment installation inside the pump station engine room, and structural reconstruction of the CS “Jaruga I” exterior and interior buildings.
CLIENT: Vodovod i odvodnja d.o.o. Šibenik
“Mičevec” Sewer Pumping Station
With the construction of the “Mičevec” pumping station and the main trunk sewer to the Central Wastewater Treatment Plant of Zagreb (CUPOVZ), all wastewater from the New Zagreb area on the right bank of the Sava River is conveyed to the CUPOVZ.
Two groups of pumps were installed—one for conveyance to CUPOVZ, with a total capacity of 1,500 l/s, and one for transferring overflow waters to the Sava River, with a capacity of 2,500 l/s.
CLIENT: City of Zagreb
Infrastructure Structure at the Radnička–Slavonska Intersection in Zagreb – Main Drainage Canal (GOK)
The construction of the GOK, with its associated connection and overflow structures, ensured stringent drainage standards for conveying the most polluted urban waters of Zagreb to the central wastewater treatment plant. The collector is sized for a flow of 65 m³/s.
From Slavonska Avenue to Kanalski Put, the collector runs along the axis of Radnička Road, after which it returns to the axis of the existing GOK. The dimensions of the closed GOK from Slavonska Avenue to the Savica collector confluence are 10.9 × 3.5 m, and from the Savica collector to the new overflow 10.9 × 4.0 m.
CLIENT: City of Zagreb
Lagoon on Highway A1: Zagreb – Split – Dubrovnik
Section: Bosiljevo – Josipdol
To protect groundwater resources, a closed drainage system with controlled discharge and stormwater treatment was built on the A1 section in accordance with water rights conditions and protection regimes.
The impermeable internal drainage included construction of pipe systems, inlets, manholes, and overflow structures along the open alignment as well as on structures and in tunnels, collecting and conveying flows to separators. On certain sensitive sections, the treated water is further conveyed to an additional treatment stage in a lagoon before being discharged to the recipient.
CLIENT: Croatian Motorways
Reconstruction and Construction of Transport Structures in Cavtat
Construction of a new waterfront in Tiha Bay, Cavtat, including two new piers and promenade improvements, as well as reconstruction of the swimming area and the Cavtat bus station.
CLIENT: Konavle Municipal Company d.o.o., Čilipi
