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Large Scale Projects

Tararua Judges Bay (2011)

Winner of 2012 IPENZ Arthur Mead Award for the application of environmental
awareness to the solution of an engineering project

  

Stormwater Solutions were engaged to provide low impact stormwater expertise for the upgrade of the Taurarua Judges Bay park and beach front. This project was run by Auckland Council with the design lead by Reset Urban Design in collaboration with subconsultants. The key aims of the project were to create a high quality park which has multiple uses including an all tides swimming spot and a quality leisure destination. It incorporates interpretive representation of a rich cultural and natural history to celebrate this “Inner City Jewel”

 Water Quality was a key driving force for the success of the Judges Bay project both for an all-tides swimming destination and on going ecological values of the bay.

Stormwater Solutions were responsible for the design of the upgrade of the stormwater network, incorporating low impact design and sustainability values for treatment of the stormwater from the catchment prior to discharge to the bay.

The treatment of the runoff was addressed in connection with the aim of reclaiming the natural waterway which was once below Judges Bay Road, the Taurarua Stream.

The existing cesspit and piped stormwater network has been diverted to a raingarden in the upper portion of the Judges Bay catchment.  The raingarden provides the upper reaches of the historical stream bed. The design elements include: 

¨ Piped entry to reflect diversion of the traditional system to surface system

¨ Stepped surface to ensure that the construction footprint was kept minimal as possible

¨ Plant selection from the local fauna palette

¨ Outlet to be as un-obtrusive as possible

¨ Filter media sourced locally 

Runoff is then diverted to a swale which reflects the surface flow in the historical stream. The treatment through the swale brings back the flow of water to the surface during rainfall events and creates a visual connection for the social environment. This day-lighting of the stream is naturally sustainable.

Choices of raingarden and swale are connected ecologically through plant selection process and urban design elements. These stormwater treatment devices are a valued contribution into the Auckland Council’s green infrastructure.  

  

Pukekohe Mega Centre (2005 - present)

 

We were engaged to provide expert stormwater management to the Pukekohe Mega Centre, at Pukekohe. This project required obtaining all the necessary consents from both Auckland Regional Council (ARC) and Franklin District Council (FDC). The ARC consents included stormwater diversion and discharge, surface water diversion and works within a watercourse.

This commercial/retail site has a high proportion of impervious coverage which required an innovative solution to surface water treatment prior to discharge to the receiving environment. Catchment wide overland flow paths and floodplains also were incorporated into the developed site to ensure the best practical application was developed for the long term operation of the site. The ARC consents were obtained efficiently and in consultation with ARC and FDC staff.

Stormwater Solutions designed an innovative device using swale and raingarden technology which were used extensively in the development.

Peter Johnston, General Manager of DNZ Property Group "Since the inception of our large format retail centre at Pukekohe (now known as Pukekohe Mega Centre), Stormwater Solutions has provided design and technical advice in relation to the various floodways and watercourses on-site. This has involved close liaison with ARC and FDC, both of which have required very detailed floodway modeling, analysis and detailed design."

"The first stage of development has seen the Tutaenui Stream, part of the Pukekohe South Catchment Management Area, enlarged so the site can cater for the 1 in 100 year rain event, installing a box culvert under the site to provide for a permanent smaller watercourse, constructing a 600 space car park so it forms part of and overland flow path and designing stormwater treatment swales. Stormwater Solutions will be commissioned for the next stage of work which will entail the design of further overland flood paths and swales."

Addison Development (2003 - present)

This was a comprehensive residential development of 14 hectares utilizing 'at source' and 'low impact' stormwater management in Takanini. It is an example of utilizing rain gardens, swales and ponds within the overall stormwater management system. The Addison development is a uniquely flat site that has been designed to replicate the natural environment using integration of other civil design constraints such as ground water recharge as well as the need to construct and lay the services in shallow depths. Raingardens provide the treatment for paved and pervious areas of the catchment whilst roof water is recharged to the groundwater table.

It was necessary to incorporate a tool box approach for best practical options for the stormwater management within the catchment, as well as focusing on the needs of this site. We were successful in obtaining ARC managers approval for the catchment management plan variation which forms part of the comprehensive stormwater discharge consent.

The detailed design of the low impact stormwater management, and supporting pipe network met the requirements of the Papakura District Council engineering standards and the client's needs to obtain a high standard for this low impact development. Detailed risk analysis has been undertaken to ensure the longevity of the stormwater management and its sustainability with respect to operation and maintenance.

Gwilym van Hoffen, who provided liaison between the developer's design team and council, said:
"The Addison development has required the adoption of many innovative aspects to the stormwater system, including rain gardens, swales and deep pipes laid at flat grades in peat soils. In particular, the design and use of raingardens and swales fell largely outside the scope of the council Development Code.

The key to achieving council signoff on the innovative infrastructure components was to provide a steady stream of sound design and analytical information, and to have regular information sharing sessions to work through the lifecycle cost, risk and maintenance implications. As a result, an agreement was struck whereby the developer will carry out the maintenance of the raingardens and swales for the first few years of operation, to ensure that any teething troubles are ironed out before council takes over full responsibility for the assets".

McLennan Developments (2007 - present)

We undertook the conceptual design and feasibility study which outlines the stormwater management options for development in the McLennan Structure Plan area, Walters Road, Papakura.
“Stormwater Solutions have been an important part of the McLennan team. In addition to contributing technical expertise, their relationship skills and interpersonal styles have been critical; both working with the existing engineering team and designers, and bringing positive working relationships with the local Council and Officers to the mix, not to mention detailed local knowledge.” Mark Fraser, Project Manager, McLennan Developments.

Following the initial stages SSCL undertook detailed design of overland flow paths and catchment analysis to ensure the clients and councils requirements we met whilst optimising the benefits to the built environment. For this stage of the project SSCL was acting as specialist sub consultant for the main civil consultant who has taken the project to construction.

Oteha Valley School, (2003 – present)

We completed a stormwater management design for the Oteha Valley Primary School from the inception to the present construction, which is the second phase of the 500+ role primary school. The stormwater management included reuse of roof runoff for toilet and irrigation purposes as well as attenuation of peak discharge flows to provide protection to the public piped and receiving environment. A large raingarden was constructed to ensure that the receiving environment was protected and doubled as a learning tool for the educational needs of the students.

This school has been operational since 2006 and is undertaking the second stage of the development at present which involves the incorporation of additional toilet reuse system as well as treatment and attenuation of the new impervious surfaces reacted.

Our role was designer and construction supervision as well as providing maintenance advice for initial stage of the site development. More recently we have undertaken the design of an additional stormwater reuse system.

Marine Industry Precinct, Hobsonville, (2007 – present)

  

Stormwater management design for the 20ha marine industry precinct in Hobsonville, situated on the previously utilised airbase, is a unique challenge due to sizeable areas of impervious coverage and large format buildings being constructed for future boat industry purposes. Construction of the first stages is due this coming construction season with detailed design underway.

Utilisation of re-use for commercial purposes has been a specialist study undertaken by Stormwater Solutions, commissioned by the consortium of various land owners to establish the viability of implementing an independent system.

Design of ponds, raingardens and dissipation units are included in the projects as well as conveying runoff during the large rainfall events to ensure safe vehicular movements within the precinct.

Settlers Retirement Village, Albany (2005 – present)

Stormwater Solutions designed the stormwater management network for the retirement village in Albany, known as Settlers. This design was based on a holistic philosophy,   integrating stormwater management with the sensitive nature of the receiving environment and the needs of the client.

The design process included the initial draft outline through to detailed design and engineering approval through the NSCC. We undertook site inspections to ensure that the construction of the stormwater infrastructure during the initial stages was undertaken to the intention of the design to deliver the environmental outcomes required.

We represented the client during resource consent hearings for applications that were notified based on planning issues and applied for resource consents to ARC and NSCC on the client’s behalf with success.

Matapana Road, Waiheke (2006 - 2009)

A large residential project, the project includes redevelopment of an existing residential property to include several buildings and recreational facilities for the property owner. The stormwater management for the site includes the implementation of treatment prior to discharge for the existing and proposed impervious surfaces whilst incorporating the client’s needs to enhance the landscaping features proposed for the property.

Close liaison has been undertaken with other disciplines within the project such as landscape designers and architects to ensure that the site is developed with empathy for the natural, physical and built environment.

An ARC stormwater discharge consent has been granted and works within a watercourse will be undertaken under permitted activity status to ensure that the integrity of the ecological environment is retained.

D&H Steel, Brick Street, Henderson (2006-2008)

This was a large format building at Brick Street in Henderson, purpose built for a steel fabrication plant. The opportunity to reuse non-potable (not drinkable) water was integrated into this project for not only the office portion of the operation but elsewhere where possible. Roof water collection and reuse for the cutting and fabricating machines was been successfully designed for the client to understand the benefits of introducing sustainability into the business. WCC building consent was granted acknowledging the reuse portion for this site.
We were successful in obtaining compliance with an existing ARC resource consent to ensure the existing wetland that serviced the catchment met the needs of TP10 standards of treatment prior to WCC taking ownership. This included design of the inlet and dissipation structures and for ownership.
Diversion of the overland flow path resulted in an innovative design for the building which was collaborated between us and the architect. Several consents were successfully obtained from the regional and local councils that required substantial stormwater management design input.

Carter Holt Harvey Whakatane Pump Station (2005-present)

Potential flooding effects due to a landfill was investigated to support a long standing consent condition. As a result of the assessment preliminary design of a pumpstation was undertaken. Resource consents for works within stop bank and discharge to the Whakatane River have been lodged and at present being processed.

“Carter Holt Harvey retained Stormwater Solutions for experienced expertise to establish the basic conceptual design of the pump station” Jim Newfield, CHH Environmental Manager.

Our involvement included providing evidence for an Environment Court hearing along with liaison with the applicant’s experts to ensure that all needs of affected parties were considered along with the regulatory authority requirements.

The Hub, Whakatane: Pumpstation (2004-2009)

Two stormwater pump stations at the recently completed Hub development, Whakatane, support the retail catchment. These pumpstation were designed to ensure that the serviceability of the centre was not compromised during frequent rainfall events and also cater for the large events. Each pump station is equipped with two high flow submersible propeller pumps of total discharge capacity up to 5m3/s during the 50yr ARI event.

These pump stations are to service over 30ha low-lying areas bounded by Kopeopeo Canal and Whakatane River for up to 50yr ARI event, in which over 20ha commercial development owned by Willis Bond and Company Ltd has been progressed in three stages.

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