Located in South Auckland, Hayman Park is Manukau City’s primary parkland, an area undergoing transformation as comprehensive city-wide redevelopment strategies aim to position the city centre as an economic and creative hub.
Hayman Park is a sprawling green space featuring extensive wetlands, which play a vital role in connecting the local community to the natural environment. Regenerative efforts are now focused on restoring these wetland ecosystems with the renewal program reshaping and extending an existing stormwater pond to assist wetland rehabilitation.
Wetland environments provide natural flood mitigation, improved water quality, and local habitat. However, the parkland receives stormwater runoff from surrounding urban catchments. Stormwater treatment is vital to prevent the conveyance of associated urban pollution from inundating downstream wetland areas, which would undermine restoration efforts.
Supporting the redevelopment of Manakau, its stormwater infrastructure is being upgraded to help foster local growth and sustainable development – delivering generational infrastructure to protect Joy in Water for future generations.
Atlan BaffleBox: High Flow Rate Stormwater Treatment
Primary stormwater treatment assets are a crucial part of Hayman Park’s transformation, and an Atlan BaffleBox will treat incoming stormwater flows to capture pollutant loads at the source. This primary treatment asset will enhance the site’s environmental resilience and align with best-practice Water Sensitive Urban Design (WSUD).
The Atlan BaffleBox’s internal baffle configuration uses a combination of chambers and a screen to settle sediment and capture floatable pollutants. Acting as a first line of defence, this performance-engineered Gross Pollutant Trap infrastructure will capture plastics, debris, suspended solids and nutrients, effectively mitigating their impacts on the park’s wetlands.
Verified through SQIDEP (Stormwater Quality Improvement Device Evaluation Protocol), Stormwater Australia’s leading framework for evaluating stormwater device performance, the BaffleBox features pollution removal efficiencies of 73% Total Suspended Solids, 59% Total Phosphorus, 39% Total Nitrogen, 99% Gross Pollutants, and 66% microplastics.
Designed for large catchment flow rates, the site’s BaffleBox measures 6 metres by 3.6 metres. This high-capacity size will ensure optimal operation during routine rainfall and larger storm events, accommodating peak flow rates of 3,540 litres per second, and water quality flow rates of 700 litres per second.
Atlan Stormwater supported the careful planning and project management for this prestigious installation throughout its design, fabrication, and logistics phases. The modular design of the BaffleBox enabled direct installation upon delivery, enhancing project timelines and schedules.
On-site handling utilized New Zealand’s largest wheel crane, capable of lifting to 450 tonnes, which enabled the unit to be positioned safely and efficiently.
Sustainable Stormwater Outcomes for Manukau City Centre
The Hayman Park project demonstrates the benefit of combining stormwater infrastructure and ecological restoration for local communities. The integration of best-practice primary stormwater treatment provides a firm foundation for wetland rehabilitation, supporting the redevelopment of downstream ecosystems and improved water quality.
During the transformation and modernization of urban areas, protecting sensitive waterways and wetlands requires investment in robust, scalable solutions. With locally developed water quality and quantity solutions to meet the requirements of urban planning and growing communities, Atlan Stormwater delivers stormwater infrastructure for the future.
Developing these systems is critical for ensuring Joy in Water for future generations – for you with your family and friends. We believe clean waterways are a right, not a privilege.
