Majority Aboriginal-Owned Civil Contractor | Pilbara, WA
Majority Aboriginal-Owned Civil Contractor | Pilbara, WA
Civil Construction Services
Professional culvert installation & drainage works contractors in WA. Servicing metro and regional areas including Perth, Karratha, the Pilbara and the South West.
Gajawari KW delivers engineered culvert and drainage installations optimized for site hydrology and load demands across Western Australia’s mining and infrastructure sectors.
Construction incorporates tailored erosion mitigation measures and flow-control features designed to maintain system integrity under variable environmental pressures.
We install pre-cast and in-situ culverts with excavation, bedding, placement, and backfill sequenced to maintain alignment and structural capacity. Installations are sized for site-specific flow rates and are integrated with road geometry to maintain traffic loading and reduce hydraulic head loss.
We construct concrete headwalls, aprons, wing walls, and inlet/outlet structures to control flow direction and prevent erosion or undermining. All components are formed and poured to specification with reinforcement tied to upstream and downstream elements for load transfer and durability.
We set drainage paths based on terrain, road design, and asset protection requirements. Flow lines are surveyed and marked in-field to ensure fall and coverage align with permanent infrastructure. Integration is planned to avoid clashes with other services or structures.
For areas exposed to concentrated stormwater or flood conditions, we install energy dissipation features, riprap, and reinforced channels. These systems prevent scouring, collapse, or flow redirection, maintaining the long-term integrity of roadways, pads, and embankments.
We manage bedding and surround material placement under and around pipes using zone-specific compaction and moisture control. Lift thickness and compaction levels are verified to avoid settlement or pipe deformation post-installation.
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