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The NRSBU is seeking to apply for resource consent for a duplicate pipeline across the estuary and has sent notification to both Nelson City and Tasman District Councils for their approval. Nelson City Council takes up the recommendation at its 28 May meeting.
With 61 submissions received on the Nelson Regional Sewerage Business Unit’s (NRSBU) regional pipeline upgrade strategy for the Bell Island Wastewater Scheme, NRSBU is analysed submissions and met to discuss them on 3 April. Twelve submitters spoke to their submission. The NRSBU has made its recommendation to both Councils.
Sewage from the service area is treated at the Nelson Regional Sewerage Business Unit's (NRSBU) Bell Island Treatment Plant and discharged into one of the main channels of the Waimea Estuary on the outgoing tide. In recent months the NRSBU has identified a critical issue with the sewer pipe for this treatment plant.
NRSBU's strategy for the regional pipeline upgrade is driven by two key concerns:
In order to make the necessary upgrades to repair this critical pipe fault, the NRSBU is required to apply for resource consent and must, therefore, seek public consultation on its proposed plans.
The Nelson Regional Sewerage Business Unit is a joint committee of the Tasman District and Nelson City Councils and was instigated to look after the owner’s (the two Council’s) interests in the Regional Sewerage Scheme. It was set up as a business unit in October 2000 and previously operated as the Nelson Regional Sewerage Authority. A Memorandum of Understanding that was signed by the two Mayors and CEOs in December 2000 governs the operation of the NRSBU.
The NRSBU treats municipal wastes (mainly domestic sewage) from Nelson City, Stoke, Tahunanui, Richmond, Wakefield, Brightwater (the Waimea Basin) and Mapua as well as industrial wastewater from Alliance Nelson,ENZA Food, and Nelson Pine Industries. The Councils also have additional sewerage schemes and associated treatment and disposal schemes.
Upgrade options focus on addressing both key concerns outlined above.
Three upgrade concepts have been identified - labelled Options A, B, and C - and are described as follows:
New pipework continues to direct flows in an anticlockwise flow direction around the Waimea Inlet, as at present.
New pipework reverses the present flow direction to a clockwise direction around the Waimea Inlet, allowing the existing estuary crossing from Monaco to Bell Island to be abandoned and avoiding other new significant estuary crossings.
New pipework directs flows in both directions around the Waimea Inlet for maximum operational flexibility and more effective utilisation of existing assets.
Within each of these three fundamental options, three further sub-categories relating to the location of the pipelines within or beyond the estuary boundaries have been considered:
The evaluation of the different options must take into account four principle factors:
For instance, the laying of wastewater pipelines in an estuarine environment, and even the siting of the present treatment plant within this environment, is of concern to many people. Additionally, with increasing pressure on agricultural water supplies in the region, future longer term planning may include considering the relocation of the present treatment plant inland so that treated effluent can be productively applied to land. How the different options might provide for future growth is also important.
In addition to these considerations, the following principles will be important to the evaluation of the options:
Download the full report
For more information contact Senior Executive Infrastructure, +64 3 546 0309.