Currency Creek Arboretum Eucalypt Research

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Dean Nicolle is a consultant arborist, botanist and ecologist based in Adelaide (South Australia), specialising in the the arboricultural assessment of trees, and particularly in all arboricultural, biological and ecological aspects relating to the eucalypts (Eucalyptus, Corymbia and Angophora).

Arboricultural consultancy
Arboricultural (tree) assessments and reports
Arboricultural (tree) audits and reports
Expert witness statements
Species/specimen identification
Species selection
Currency Creek Arboretum tours and consultancy

Arboricultural consultancy (tree assessments and reports)
In accordance with the Development Act 1993 and the Development (Regulated Trees) Variation Regulations 2011, local government development approval is required to remove, prune (certain pruning only) or damage any 'Regulated' or 'Significant' tree as defined by the Act in the greater Adelaide metropolitan area.

What constitutes a 'Regulated' or 'Significant' tree depends on a number of factors, including its species (some species are exempt in certain situations), its total and average trunk circumference, its locality, and its proximity to certain structures (among other criteria). Dean Nicolle can provide expert advice regarding the legal status of a tree according to the Act (an on-site inspection of the tree is usually required).

Dean Nicolle has produced tree assessment reports for over 10,000 individual trees in the Adelaide metropolitan area since 2002. Dean Nicolle has provided advice to most metropolitan and regional councils in South Australia on a non-exclusive basis, and can therefore provide advice to all government departments, non-government institutions, and companies as well as to private individuals. Recommendations made as part of an arboricultural assessment may include:
  • Tree removal or retention (including prioritisations)
  • Pruning strategies
  • Engineering solutions
  • Tree management plans
  • Tree maintenance
  • Tree Protection Zones (TPZs; development sites only)
  • Structural Root Zones (SRZs; development sites only; if relevant)
  • High Use Setbacks (HUSs; development sites only; if relevant)
Arboricultural (tree) assessments and reports
Suitable for single trees, or small numbers of trees included within a single assessment and report. Involves a detailed arboricultural assessment, including the following sections within a written report:
  • Background (if relevant)
  • Legal status of the tree ('Regulated', 'Significant' or not controlled)
  • Tree Species (scientific and common name)
  • Tree Description and Location (including significant status, tree characteristics, age, future size and proximity to infrastructure)
  • Tree Health and Longevity
  • Tree risk assessment (including the current likelihood and consequence of structural failure, anticipated future risks and potential damage to structures)
  • Addressing Council Development Plans (if relevant)
  • Recommendations
Arboricultural assessment and reporting fees are based on an hourly rate of $160 per hour (inc. GST). The below cost estimates are based on single trees. Assessments and reports for multiple trees on a single site can be assessed for significantly less per tree.
  • On-site assessment and verbal report (typically 1 hour/$160)
  • On-site assessment, verbal report (if requested) and written email summary (typically 1.5 hrs/$240)
  • On-site assessment, verbal report (if requested) and detailed written report (typically 3.5 hrs/$560)
Arboricultural (tree) audits and reports
Suitable for larger numbers of trees included in a single assessment and report, such as for greenfields and other broad-scale developments, and baseline data collection for schools, councils and large allotments. An arboricultural audit involves the assessment of the trees and a report explaining and summarising the data and providing recommendations. An layered PDF map may also be provided to assist in management and decision-making regarding audited trees. An arboricultural audit will usually include the following data for each tree:
  • Tree location and identification (labelled on a pre-existing survey plan or aerial image)
  • Species identification (scientific and common name)
  • Legal status of the tree, as defined by the Development Act 1993 and the Development (Regulated Trees) Variation Regulations 2011)
  • Estimated tree age (in years)
  • Tree origin (remnant, planted, self-seeded weed, etc.)
  • Projected further life expectancy
  • General tree structure/form
  • Risk to personal safety and to property
  • Biodiversity value
  • Landscape value
  • Retention/removal priority
  • Recommended Tree Protection Zone using AS 4970, including all associated data used to calculate an appropriate TPZ (development sites only)
  • Recommended High Use Setback (development sites only)
Arboricultural (tree) auditing and reporting fees are calculated using a base rate of $960 plus a per-tree rate of (all figures include GST):
  • For non-development sites:
  • <50 trees$32 per tree
    50 to 500 trees$28 per tree
    >500 trees$24 per tree
  • For development sites (including Tree Protection Zones and High Use Setbacks):
  • <50 trees$36 per tree
    50 to 500 trees$32 per tree
    >500 trees$28 per tree
Expert witness statements
Dean Nicolle has provided verbal and written expert witness statements for the Environment, Resources and Development Court (ERD) for tree-related matters on numerous occasions. Dean Nicolle has also provided expert advice (both verbal and written) on tree-related matters to the District Court of South Australia, the Supreme Court of South Australia and the Supreme Court of Victoria.
Expert witness fees are based on an hourly rate of $180 per hour (inc. GST). Interstate and overseas consultancy is based on a daily rate of $1200 per day plus travel costs incurred.

Species/specimen identification
Within the eucalypts (genera Angophora, Corymbia and Eucalyptus), locally indigenous and exotic specimens from anywhere in Australia or worldwide can be identified. Specimens can be identified from digital images (less reliable but rapid identification), pressed and dried specimens, and live plants in-situ (most reliable but less rapid identification).
Identification fees are based on an hourly rate of $140 per hour (inc. GST). Rates can also be negotiated on a per-image, per-specimen or per-tree basis. One-off identifications and small numbers of identifications may not be charged.

Species selection
Species selections can be provided for plants for a variety of sites in the greater Adelaide area and southern Australia more generally. Sites that may require species selections include private and public gardens, revegetation sites, parks, streets, and natural landscapes.
Species selection fees are based on an hourly rate of $160 per hour (inc. GST).

Currency Creek Arboretum tours and consultancy
Dean Nicolle can lead walk-and-talk groups or individual tours of the arboretum, which can focus on the group or individualís interests and/or requirements. Visit the page of Currency Creek Arboretum for more details.
Currency Creek Arboretum tour and consultancy fees are $400 per half-day (inc. GST).

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