Consent - Blackmores

A summary of the intended purpose of the consent is covered below, however for the full consent requirements, please contact Mike Brazil on 027 453 3309.


Purpose:  Authorises the excavation and removal of gravel from within a stretch of an unnamed tributary of the Mataura River that extends from 40 metres upstream to 130 metres downstream of the State Highway 6 culvert (the ‘Blackmore culvert’) at Garston


  • Periodic clearing of gravel build-up only as is necessary to maintain or restore the flood carrying capacity of the unnamed tributary
  • Within 1 metre either side of the culvert, the base of the excavation shall not be lower than 300 mm above the invert (inner surface at the bottom) of the culvert
  • The excavations upstream and downstream of the culvert shall result in bed gradient that is approximately even between the levels described above and the unexcavated areas at either end of the stretch
  • The works shall not widen the channel beyond the natural riverbed
  • Notify in writing (email: [email protected]) no less than one working day prior to the commencement of each extraction event and provide confirmation upon completion of the works
  • Must take colour photographs prior to the start of work and following completion of work.  Specific requirements and where these need to be sent are available from Mike.
  • Maintain a daily record of the volume of gravel extracted and submit this record to the Consent Authority within one month of the works
  • If an event (such as contamination to water from a fuel or sediment discharge incident) occurs that may have significant adverse effect on water quality at the abstraction point of a registered drinking-water supply,  please stop work and contact Mike as there are agencies who need to be informed
  • Works in water shall be kept to a minimum to avoid discoloration to the downstream waterbody
  • No heavy vehicles shall cross flowing water
  • Fish passage is not impeded as a result of the exercise of this consent
  • There shall be no damage to trees on the river bed or in riparian areas
  • No stockpiling of gravel in the bed of the river
  • No washing or refuelling of machinery in the bed of the watercourse
  • All construction equipment, machinery, plant, and debris are removed from the site on completion of the work
  • At the end of each extraction event the site shall be contoured to resemble a natural form
  • No disturbance of the roosting and nesting areas of the black fronted tern, black billed gull, and banded and black fronted dotterel, or the feeding areas of the banded and black fronted dotterel
  • Minimise the spread of pest plants and aquatic weeds - remove any vegetation caught on the machinery. clear vegetation from the site before gravel is extracted, avoid working in areas where aquatic weeds are known to be present 
  • If artefacts of any sort are found work must stop immediately, and contact Mike for further info