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  Council » Policies and Plans » Rules and regulation » Waikato Regional Plan » Waikato Regional Plan (online version) » 6.1 Regional and Local Air Management » 6.1.20 Implementation Methods - Cooling Processes

6.1.20 Implementation Methods - Cooling Processes

6.1.20.1 Permitted Activity Rule - Water Vapour, Water Droplets and Steam from Cooling Processes at a Rate of Heat Release Not Exceeding 50 MW

The discharge of water vapour, water droplets and steam at a rate of heat release not exceeding 50 MW maximum capacity is a permitted activity subject to the following conditions:

  1. The plume shall not cause shadowing beyond the boundary of the subject property,
  2. The plume shall not extend beyond the boundary of the subject property or otherwise cause nuisances such as ground fogging or icing,
  3. The discharge shall not impinge upon any aircraft flight path,
  4. Hexavalent chromium compounds shall not be added to the cooling water,
  5. Any biocides added to the cooling water must be used in accordance with the requirements of any licence issued under the Hazardous Substances and New Organisms Act 1996,
  6. As specified in Section 6.1.8 conditions a) to e) of this Plan.

Explanation and Principal Reasons for Adopting Method 6.1.20.1
Rule 6.1.20.1 is intended only to apply to the discharge of water vapour, water droplets and steam that does not contain volatile contaminants, such as from process waters or condensates.

General permitted activity condition 6.1.8 d) provides for visibility impairment beyond the boundary but special provision is needed where a large scale source is located in the vicinity of an aircraft flight path hence condition c) above. Conditions a) and b) above ensure that the plume will not have nuisance effects from blocking sunlight or fogging and will not result in droplet deposition that could cause icing. Conditions d) and e) relate to the use of biocides that are added to cooling water to control microbial growth and are intended to ensure that hazardous compounds are not released in the discharge.

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