Storage Liners    

Answers to frequently asked questions about storage liners.

Are Clay Liners Acceptable?    

Tasman District Council stipulates a standard regarding the sealing of the material selected for effluent facilities. It does not currently determine exactly what these materials are, as technological advancements can introduce new products.

With regards to clay, it is possible to achieve the sealing standard, however there are a number of associated challenges with clays.

Clay should be professionally tested to establish if it has the necessary properties. If suitable clay has to be imported then this can be costly. Clay also requires specific compaction techniques to ensure sealing. This again should be carried out by a professional. Clay liners can susceptible to cracking when empty, which can compromise the sealing and result in leaks.

Stirring of ponds, wind and wave action can also wear and erode the clay liner.

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What Types of Liners Are There and What Is The Best One?    

There are a number of products currently being used in New Zealand for effluent ponds and tanks. DairyNZ’s ‘Farm dairy effluent systems – A farmer’s guide to building a new effluent storage pond’ summarises the pros and cons of clay, concrete and synthetic liners.

Download from Dairy NZ website: Farm dairy effluent systems – A farmer’s guide to building a new effluent storage pond

Other materials, such as metal, have been used in effluent systems overseas. DairyNZ in conjunction with technical experts are reviewing the suitability of materials to meet regional council sealing standards and it is recommended to regularly check their website and publications library for any additional information related to effluent systems.

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