Drainage & Civil Works
Drainage & Civil Works — Western Australia
Table drains, culverts, stormwater systems, kerb and channel, subsurface drainage, and retaining walls — delivered across civil and mining projects throughout WA.
Dunamis delivers drainage and civil works as part of broader road construction and civil infrastructure scopes — or as standalone drainage packages where the scope requires it. We construct to client-supplied designs, and where design isn’t yet in place we can engage reputable engineering consultants to develop drainage solutions before construction begins.
Our drainage capability spans the full range of civil drainage types — from table drains and culverts on road projects through to stormwater systems, subsurface drainage, and erosion control on civil and mining sites.
Our Drainage & Civil Capabilities
Site Assessment and Planning
Conduct detailed site inspections and assessments to determine drainage requirements. Develop comprehensive plans and designs for effective drainage solutions and civil infrastructure.
Installation of Drainage Systems
Implement a range of drainage systems including stormwater, surface, and subsurface solutions. Install and maintain pipes, channels, and catchment systems to manage water flow efficiently.
Excavation and Earthworks
Perform excavation and grading to prepare sites for drainage and civil construction. Ensure proper soil handling and compaction to support infrastructure.
Infrastructure Construction
Construct and repair civil infrastructure such as roads, pavements, and retaining walls. Ensure structures are built to specification, with a focus on durability and safety.
Maintenance and Repairs
Conduct regular maintenance and inspections of drainage systems to ensure optimal performance. Address and repair any issues such as blockages, leaks, or structural damage.
Erosion Control and Management
Implement erosion control measures to prevent soil erosion and protect waterways. Use techniques like silt fencing and sediment basins to manage runoff effectively.
Compliance and Quality Assurance
Adhere to industry standards and regulatory requirements for drainage and civil works. Perform quality checks to ensure all work meets or exceeds required specifications.
Environmental Impact Mitigation
Integrate sustainable practices to minimize environmental impact. Implement measures to protect natural habitats and water quality during construction.
Project Management and Coordination
Oversee project timelines, budgets, and resource allocation. Coordinate with other contractors, engineers, and stakeholders to ensure smooth project execution.
Drainage and civil works — every type, every environment
We’ve delivered drainage works across road construction, civil infrastructure, and mining projects throughout WA. Our scope covers the full range of civil drainage types — from simple table drains on rural roads through to complex stormwater systems and culvert installations on major civil projects.
Table Drains & Cut-Off Drains
Construction of table drains, independently graded drains, and cut-off drains along road corridors and civil infrastructure — designed to intercept and redirect surface water away from pavement and sensitive areas.
Culvert Installation
Supply and installation of reinforced concrete box culverts, pipe culverts, and associated concrete end treatments — sized and placed to manage water flow across roads, haul roads, and civil infrastructure. .
Stormwater Systems
Construction of stormwater drainage systems including pits, pipes, channels, and outlets — managing surface water on civil construction sites, industrial facilities, and mine site infrastructure.
Subsurface Drainage
Installation of subsurface drainage systems to manage groundwater and subgrade moisture — critical for pavement longevity on road construction projects and civil infrastructure in areas with high water tables.
Swales & Surface Drains
Construction of grassed swales, lined channels, and surface drainage systems to manage stormwater runoff on civil and mining sites — protecting pavements, embankments, and disturbed areas from erosion.
Erosion Control
Self-performed erosion control works including sediment barriers, silt fencing, diversion banks, and surface protection measures — protecting disturbed areas and waterways during and after construction.
Don't have a drainage design yet? We can help.
Most of the drainage scopes DCG tenders already have engineering designs in place — we construct to the client-supplied design. But where design isn’t yet developed, we can engage reputable civil engineering consultants to produce drainage designs before construction begins.
This means you deal with DCG as a single point of contact from design engagement through to construction completion — rather than managing a separate design consultant and construction contractor across the same scope.
Drainage maintenance & repairs — keeping your systems performing
Beyond construction, DCG offers drainage maintenance and repair services for civil and mining clients — inspections, blockage clearance, pipe repairs, drain regrading, and culvert maintenance. Keeping drainage systems performing is critical to protecting pavement and civil infrastructure from water damage over the long term.
Available across Perth metro, regional WA, and remote project sites.
Drainage works delivered to specification
Brand Highway / Hunter Road Intersection Upgrade — Wheatbelt WA
DCG delivered a comprehensive drainage package as part of the full civil scope for the MRWA intersection upgrade — including table drains, independently graded drains, surface drains to culvert outlet, installation of reinforced concrete box culverts with reinforced concrete end treatments. All drainage works delivered to full MRWA specification and compliance on first inspection.
What makes Dunamis the right drainage partner
Full drainage scope capability
Table drains, culverts, stormwater systems, kerb and channel, subsurface drainage, swales, retaining walls, and erosion control — the complete range of civil drainage types delivered across road construction, civil infrastructure, and mining projects.
MRWA specification capable
Drainage works delivered to full Main Roads Western Australia specification — independently verified through first inspection compliance on the Hunter Road Upgrade in the Wheatbelt.
Design engagement available
Where drainage design isn't yet in place, DCG can engage reputable civil engineering consultants to develop the design before construction begins — one point of contact from design through to delivery.
ISO 9001, 14001 & 45001 certified
Quality, environmental, and safety management all independently certified through Global-Mark — with particular relevance for drainage works where environmental compliance and water quality protection are critical.
Frequently Asked Questions
What drainage services does Dunamis provide?
We deliver the full range of civil drainage works — table drains, cut-off drains, culvert installation, stormwater systems, kerb and channel, subsurface drainage, swales, retaining walls, and erosion control. We construct to client-supplied designs, and can engage engineering consultants to develop drainage designs where needed.
Do you offer drainage design services?
DCG constructs to client-supplied engineering designs in most cases. Where a design isn’t yet in place, we can engage reputable civil engineering consultants to develop drainage solutions before construction begins — managing the design engagement as part of the overall scope.
Can you deliver drainage works to MRWA specification?
Yes — we have delivered drainage works to full MRWA specification, most recently on the Brand Highway / Hunter Road Intersection Upgrade in the Wheatbelt where all drainage works achieved full specification compliance on first inspection.
Do you offer drainage maintenance and repairs?
Yes — DCG offers drainage maintenance and repair services including inspections, blockage clearance, pipe repairs, drain regrading, and culvert maintenance across Perth metro, regional WA, and remote project sites.
Can you deliver drainage works on remote and mining projects?
Yes — our plant and crews are available for drainage and civil works across all WA regions and interstate, including remote Pilbara and Kimberley project environments.
What plant do you use for drainage works?
Our drainage works are delivered using CAT excavators from 15-tonne to 40-tonne,compaction equipment, loaders and supporting civil plant — owned, mine-spec maintained, and available for rapid mobilisation across WA.
Do you work as head contractor or subcontractor on drainage projects?
We work in both arrangements — as a specialist drainage subcontractor delivering drainage packages within a broader civil or road construction scope, or as head contractor on standalone drainage scopes. Contact us to discuss your specific project requirements.
What regions do you cover?
Perth metro, Southwest WA, Great Southern, Wheatbelt, Kalgoorlie–Esperance, Midwest Gascoyne, Pilbara, Kimberleys, South Australia, and Northern Territory.
Driven to Deliver with Precision and Certainty
Partner with Dunamis for your next project—supporting Principal clients and Tier 1–3 contractors across Western Australia with high-quality civil delivery and reliable on-site performance.
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