Why GWE for Onsite Stormwater Design
Prevent flooding
we design systems that manage rainfall and runoff to protect buildings, landscapes and infrastructure.
Support sustainability
our design services are engineered to maintain natural hydrologic cycles and encourage onsite stormwater retention and reuse.
Improve water quality
our systems reduce water pollution, foster biodiversity and enhance your site’s environmental resilience and compatibility.
Build resilience
our designs harmonise with your site’s existing constraints and comply with all regulations, upholding highest quality standards.
What we do
Our onsite stormwater designs are tailored to each property, combining engineering precision with environmental sensitivity.
Includes:
Bioretention cells and rain gardens
Full infiltration systems from downspouts
Detention tanks, soakage pits and swales
Best Management Practices (BMPs) designed to New Zealand standards
Integrated solutions that work with site geology, hydrology and development goals
Sustainable Solutions
We design innovative stormwater management systems that do more than just manage water runoff. Our designs integrate effective stormwater management with the broader sustainability of your project. Our systems reduce water pollution, foster biodiversity, and enhance your site’s environmental resilience and compatibility.
Compliance Assurance
Our designs meet regulations and uphold the highest quality standards, including adherence to the Building Code, Health and Safety at Work Act, and Environmental Protection Standards in New Zealand, giving you confidence your project is fully compliant, ensuring its safety, quality, and legality.
Risk Mitigation
Our comprehensive services are specifically engineered to reduce the risk of flooding and water damage, providing optimal protection and preserving the value of your investment. With our advanced technologies and expert solutions, your property is secure against any potential water-related risks.
Why Choose GWE
Expert design
meticulously tailored to your site’s unique requirements; balancing water flow, minimising environmental disruption and safeguarding longevity.
Sustainable solutions
our systems reduce water pollution, foster biodiversity and enhance your site’s environmental resilience and compatibility.
Compliance assurance
Our designs meet regulations and uphold the highest quality standards, giving you confidence your project is fully compliant.
Risk mitigation
we engineer to secure against the risk of flooding and water damage, providing optimal protection and preserving the value of your investment.
How we work (LIFT)
L
Listen
we begin with a thorough understanding of your site’s geology, hydrology and development goals.
I
Innovate
we integrate Best Management Practices and modern infiltration/reuse systems for smarter solutions.
F
Follow Through
we prepare compliant design reports, support consents and oversee installation to ensure systems work as intended.
T
Team Up
we collaborate with architects, contractors and councils to deliver integrated, buildable outcomes.
Frequently Asked Questions.
Do I need onsite stormwater design for my development?
Yes, most developments require stormwater systems to manage runoff, protect neighbouring sites and comply with council requirements.
What’s the difference between detention and infiltration?
Detention systems temporarily hold runoff before controlled release. Infiltration systems allow stormwater to soak back into the ground. We’ll help identify the right option for your site.
Can stormwater be reused onsite?
Yes, in many cases, systems can be designed to capture and reuse stormwater for irrigation or non-potable applications.
How do I know if my site is suitable for infiltration?
We carry out geotechnical and soakage testing to determine suitability and ensure designs are safe, efficient and compliant.