Introduction

HITZ Drainage Contractors delivers professional drainage, earthworks, pipe installation and civil contracting services across Gold Coast, Brisbane and South East Queensland. Below are recent project case studies showcasing our work, the challenges we solve, and the outcomes achieved for residential, commercial and industrial clients.

Case Study 1: Stormwater Upgrade for a Sloping Block – Gold Coast Hinterland

Project Overview

A homeowner in the Gold Coast Hinterland experienced severe stormwater overflow during heavy rainfall. The existing system was outdated and unable to handle runoff from the steep slope.

Challenges

• Significant fall across the property

• Water pooling behind retaining walls

• Old terracotta pipes causing blockages

• High rainfall catchment area

Our Solution

We completed a complete stormwater upgrade:

• Installed new PVC stormwater lines

• Added surface drainage pits across the upper slope

• Installed ag drains behind retaining walls

• Corrected and re-graded pipe falls

• Redirected stormwater to a compliant legal discharge point

Result

• No more flooding during storms

• Retaining walls protected

• Improved property drainage and value

• System now meets QDC and council requirements

Case Study 2: Civil Drainage for Duplex Development – Brisbane Southside

Project Overview

A local builder required compliant civil drainage and earthworks for a modern duplex build.

Scope of Work

• Bulk earthworks and site preparation

• Trenching and stormwater pipe installation

• Driveway drainage installation

• On-site detention system (OSD) setup

• Downpipe connections

• Final trim and compaction

Challenges

• Tight access on the construction site

• Strict Brisbane City Council drainage standards

• Shared drainage between two dwellings

Our Solution

We delivered a fully compliant drainage system:

• Laser-level installation for accurate pipe falls

• Engineered OSD system

• High-quality compaction for driveways and paths

• Coordination with builder to prevent delays

Result

• Passed council inspections on first submission

• No construction delays

• Long-term drainage performance

Case Study 3: Industrial Hardstand Drainage Upgrade – SE Queensland

Project Overview

An industrial client experienced severe water pooling around sheds and equipment during storms.

Issues Identified

• Inadequate surface falls

• Undersized drainage pipes

• Damaged pits

• Erosion risks around high-traffic areas

Our Solution

• Re-graded hardstand to improve water flow

• Installed commercial-grade stormwater pits

• Upgraded pipes to 150–300mm diameter

• Added culverts for heavy-vehicle access

• Reinforced high-traffic areas with compacted base

Result

• Water now drains efficiently

• Improved safety for equipment and machinery

• Hardstand can withstand heavy rainfall events

Case Study 4: Backyard Flooding Repair – Logan / SE QLD

Project Overview

A homeowner struggled with constant backyard flooding, making the yard unusable after rain.

Work Completed

• Installed 90mm stormwater pipes

• Added three surface drainage pits

• Installed a French drain/ag drain system

• Removed tree roots obstructing old pipes

• Re-graded yard levels and installed new turf

Result

• Backyard remains dry even in heavy rain

• Drainage issues permanently resolved

• Improved usability and property value

Conclusion

These projects demonstrate the capability and experience of HITZ Drainage Contractors in delivering high-quality drainage and earthworks solutions across Gold Coast, Brisbane and South East Queensland. Whether it’s residential stormwater problems, civil construction drainage or commercial upgrades, our team provides reliable, council-compliant results.

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