Stormwater & Flood Engineer in Mackay

  • 70+ Years of Combined Experience
  • End-to-End Project Delivery
  • 700+ Successful Job Completions

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A Man is Working on a Pipe — CWD Group in Mackay, QLD

Mackay Stormwater & Flood Engineer

At CWD Group, we combine environmental responsibility with technical precision to deliver stormwater drainage solutions that serve both Mackay’s development needs and natural ecosystems. Our experienced stormwater and flood engineers design systems that reduce runoff, prevent erosion and support sustainable urban growth.


Using advanced modelling tools such as MUSIC and TUFLOW, we create detailed stormwater plans and implement water-sensitive urban design features. Our team also manages inspections, on-site detention (OSD) certification and drainage reporting for council approvals.


Whether your project is residential, commercial or industrial, we ensure it’s equipped with innovative, future-proof drainage systems. Trust our team to deliver solutions that are compliant, environmentally conscious and cost-effective.
Call us today on (07) 3472 5918 for enquiries.

Innovative, Compliant Solutions

Choosing CWD Group means partnering with a civil engineering team that understands the full lifecycle of your project. We specialise in civil infrastructure, stormwater design, flood and overland flow management, and water and wastewater connections—providing complete support from initial assessments to construction-ready documentation.


With a strong technical team that includes experienced flood engineers and RPEQ-certified professionals, we help you navigate complex requirements, minimise risk and ensure council compliance. We’re driven by outcomes, offering innovative and tailored solutions that are grounded in local conditions and proven engineering practices.


Our record speaks for itself: 700+ projects successfully delivered and a reputation for professionalism and practical results. Whether you're a developer, builder or council project manager, we strive to ensure timely, on-budget delivery and confident approvals.

A Close Up of a Drain Pipe With Water Coming Out of It — CWD Group in Mackay, QLD

Frequently Asked Questions

  • What is an On-site Stormwater Detention (OSD) system?

    An OSD system temporarily stores stormwater runoff and releases it at a controlled rate to reduce downstream flooding risk. It’s especially important in urban areas with limited natural infiltration. OSD systems are typically required when new developments increase the impervious area of a site and affect existing drainage conditions.

  • What is an easement for stormwater?

    A stormwater easement is a legal right that allows drainage infrastructure to pass through or discharge onto a neighbouring property. Easements are often registered on property titles and must be maintained clear of obstructions. If your site requires drainage through another lot, legal and council approval for an easement may be required.

  • How do you calculate stormwater runoff?

    Stormwater runoff is calculated based on site size, land slope, rainfall intensity and surface types. Engineers use formulas or software to estimate peak flows, then size pipes, pits and storage accordingly. These calculations are critical to prevent flooding and ensure your system meets the applicable Australian Standards and council codes.

  • What are common stormwater treatment options?

    Common treatment options include rain gardens, gross pollutant traps, swales, infiltration trenches and constructed wetlands. These systems help remove pollutants, manage flow and improve water quality before discharge. The right treatment depends on your site’s location, size and environmental sensitivity, and may be guided by MUSIC modelling and WSUD principles.