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How information is collected

Eleven Landfills (of 16 located in the pilot area) record disposal quantity as tonnage. In 2003 these accounted for around 286,000 tonnes or 76 % of the waste quantity in the Waikato and Bay of Plenty, the remainder of the landfills record quantity based on a combination of volume delivered and site surveys. Where only waste volume figures are available, waste tonnage has been estimated.

Where disposal tonnages are measured using weighbridge, the information is available, in theory, on a daily basis. Information could even be provided on a load by load basis. Volume based data is generally an assessed volume, based on either typical volume for different vehicle or load types or measurement of the change in the volume of the landfill. In the second case information may only be collected 6 monthly or annually and needs to make an allowance for the degree of cover material used over the period.

There are several organic waste processing companies in the Waikato and Bay of Plenty. Approximately two thirds of the organic waste is passed over a weighbridge and accurately weighed.

There are several companies involved in consolidating recyclable material in Waikato and Bay of Plenty. Data is a mixture of tonnage and volume based with approximately xx % tonnage.

To ensure that data is comparable disposal and diversion information be:

  • Provided on an annual basis.
  • Split by regional source i.e. organic waste from the Bay of Plenty Region. If possible defined down to territorial local authority area.

How is quantity information recorded:

District Landfill Recycling Compost
Waikato District Weighbridge Weighbridge Volume
Hamilton City Weighbridge Weighbridge Volume
Waipa District Weighbridge Weighbridge  
Hauraki District Weighbridge Weighbridge Weighbridge
Thames Coromandel Weighbridge Weighbridge  
Matamata Piako Weighbridge Weighbridge Weighbridge
South Waikato Weighbridge/ Volume Weighbridge Volume
Otorahanga District Weighbridge Weighbridge  
Waitomo District Weighbridge Weighbridge  
Taupo District Volume Weighbridge Volume
Western Bay of Plenty District Weighbridge Weighbridge Volume
Tauranga District Weighbridge Weighbridge Volume
Whakatane District Volume Weighbridge Weighbridge
Kawarau District Volume Weighbridge Weighbridge
Rotorua District Weighbridge/ Volume Weighbridge Weighbridge
Opotiki District Volume Weighbridge  

Commercial data

While there is the potential for commercial advantage to be gained or lost through sharing data about waste quantities (both disposed and diverted), the commercial operators participating in the pilot project have been able to share data on the understanding that reporting will be on a regional basis. This ensures that commercially sensitive data such as the identity of individual clients and quantities of waste from small areas is not made available through the reporting process.

Completeness of the data set

The data received to date includes:

  • quantities of waste disposed of to landfills in Waikato and Bay of Plenty
  • commercial green waste composting quantities
  • a portion of recyclables quantities
  • SWAP Data from historical surveys and initial results from the SWAP Baseline Programme.

Data missing includes:

  • material disposed of to cleanfills (estimates for two major sites have been included)
  • material disposed of to on-site landfills including dedicated industrial sites and farm dumps.

Last updated: 17 September 2007