Scenario 5: Local authority – county council
Scenario 5 relates to a county council with a significant urban or peri-metropolitan component. The county council provides services to approximately 1 million residents. One-half of the county is heavily developed and includes a large portion of the overall population in large and medium-sized market towns. The other half is predominantly rural and sparsely populated, with most of the land managed for agriculture.
General information
The county council is responsible for trees on its own land and for ensuring the safety of the public highway and can intervene if trees on adjacent private land are identified as posing a threat. Within the county, trees on district, borough, town and parish council land are the responsibility of the respective councils and are managed according to their policies; a joined-up approach is sought where appropriate and regular meetings of district and borough council tree officers are held to share experiences and best practice.
The county council employs one arboricultural manager to oversee management of its highway trees, one estates officer to manage trees and woodlands across its rural estate, and a countryside management team to manage a prominent woodland nature reserve, the rights of way network and to provide land-management advice to staff and landowners, including support to address risks associated with pests, diseases and other factors affecting tree health.
Ownership/control of management
Responsibility: The county council is responsible for managing trees:
- on 5000 km of highway land in 10 district areas (delivered in seven districts through agreements by district councils);
- on 3200 km of rights of way in 10 district areas;
- on 4500 ha of rural estate land, much of which has public access;
- on a variety of other council-owned property assets;
- in 400 schools.
The arboricultural manager oversees contract management for the survey and maintenance of trees on highway land that is delivered by seven district council tree officers through agency agreements and by a dedicated highways contractor.
The estates officer oversees tree survey and maintenance of the county council’s rural woodlands and agricultural land, which is outsourced to an approved contractor. The countryside management team manage a prominent woodland nature reserve in-house and outsource surveys of the rights of way network to an approved contractor.
Arboricultural competence: The arboricultural manager has arboricultural qualifications at Level 5 of the Regulated Qualifications Framework (RQF), plus a professional tree inspector qualification, and 30 years’ experience. The estates officer has attended tree inspection training and has 14 years’ experience of woodland management. The countryside management team comprises access and land management specialists who have attended tree inspection training.
Access
Much of the county council’s land is accessible, with a 5000 km highway network, 3200 km of footpaths, bridleways and byways, 400 ha of accessible woodland and council buildings that are accessible to residents and staff. Much of the estate is in frequent use by the public.
Benefits of trees
The county council places great value on its trees and woodlands and the contribution they make to local services, improved air quality, flood-risk mitigation, carbon storage, forage and habitat for biodiversity, landscape and place. Residents are encouraged to visit and enjoy woodlands and green spaces.
The county council acknowledges the local importance of individual trees for the benefits they provide to people and nature, particularly veteran trees, which require careful management to enhance their longevity while maintaining acceptable levels of risk. Where possible, the county council adopts management approaches that mitigate the risks from individual trees without diminishing the benefits provided by the overall treescape.
Natural living organisms
The county council recognises that a tree’s benefits and the management it requires will fluctuate throughout its lifespan. Consequently, management that promotes the health, longevity and resilience of the wider treescape as a collective, and which takes the various tree populations into account, is an effective strategy for ensuring the continued provision of countywide tree-related benefits. To make the best use of tree budgets and optimise tree benefits, where practicable the county council adopts proactive resource management of its trees and woodlands through traditional and conservation forestry principles and sustainable urban forestry, which include endeavouring to diversify the age and species profile of its tree asset, improving local habitats and promoting biodiversity.
In recognition of the increasing pressures upon tree health posed by pests, diseases and a changing climate, the county council added tree health to its corporate risk register and instructed the development of a county-wide Tree Resilience Strategy in partnership with other local stakeholders. The county council has significant incidence of Chalara ash dieback and some instances of acute oak decline. It has developed a Chalara ash dieback strategy to plan for and manage levels of intervention as the disease has spread widely through the county.
Investigating for signs of Chalara ash dieback is part of the scheduled survey regime, which also includes a drive-by survey of the highway network to identify signs of dieback in roadside ash on both highway and adjacent private land across the county and record this for targeted action. The county council communicates actively with neighbouring authorities with Chalara ash dieback to control risks appropriately while avoiding unnecessary loss of ash-dependent habitat.
The county council monitors national guidance and initiatives in relation to tree pests and diseases and their impacts on their tree populations. Increased focus on biosecurity and treescape resilience is being incorporated into woodland restoration and new woodland planting initiatives.
Strategy
Management
The county council’s tree management varies across its estate, reflecting its diverse land holdings, and zoning supports survey and management decisions. Highway engineers and other non-arboricultural staff are trained in basic tree inspection so that informal and formal checks can inform the need for further inspection. Zoning is dictated by land type, levels of use and proximity to population centres.
Occupancy zones are categorised using either a ‘high/ medium/low’ or ‘high/low’ classification system. The urban highway tree asset is zoned according to a high/low occupation classification, while the county council’s rural highway trees are zoned as ‘high/medium/low’, to account for the wider range of management contexts, based on road classification.
The urban highway trees are subject to walk-over checks, supplemented by driveby checks following severe weather events. The rural highway asset trees are checked by means of regular scheduled drive-bys, supplemented by walk-over checks when required. The frequency of surveys of trees and woodlands in other rural areas is planned accordingly with all trees in high and medium occupancy zones proactively receiving formal walk-over assessments on a schedule set by the arboricultural manager. Individual trees identified as potentially representing a significant hazard receive a more detailed inspection.
A more reactive and informal approach is taken to trees in low occupancy zones, and in some remote areas no formal checks are carried out. Managing risk from trees on the county council’s rural land holdings is often achieved through the adoption of forestry principles, which incorporate the felling of potentially high-risk trees into routine forestry operations. Because of the county council’s desire to retain individual trees in urban settings to maintain the local benefits they provide, managing risk from highway trees is often achieved through arboricultural techniques that mitigate risk while leaving the tree in situ.
The arboricultural manager has begun to introduce sustainable urban forestry principles to both diversify tree species and age distribution, and to safeguard existing valuable tree assets for the longterm resilience of the tree population.
Competence
Proactive surveys of the highway network tree stock are outsourced to seven district councils and a dedicated highways contractor. Proactive surveys of the rural estate and rights of way network are outsourced to approved contractors. Proactive surveys of the woodland nature reserve managed by the countryside management team are conducted in-house. All surveyors are adequately trained and qualified.
Records
Residents’ enquiries about tree-related hazards and any queries arising from informal checks are logged and categorised so that they can be followed up as appropriate. Trees on the county council’s highway and rural estate land are recorded on separate purpose-built tree-management systems that allow trees to be plotted on-site, using GIS-based software. Those trees that pose a risk are plotted for future inspection and management. The plan is for both systems to be integrated into one consolidated GIS-database system.
Evaluation
The county council’s finite resources are allocated to ensure it reasonably meets its duty of care by demonstrating a practicable and defendable approach to tree management. This involves prioritising resources, so that higher occupancy zones and individual trees that present a sufficient risk to warrant a higher level of assessment receive an appropriate level of inspection.
Where possible, the county council follows sustainable principles for both forestry and urban forestry in seeking to incorporate treescape management that balances survey and maintenance costs with the need to retain and enhance the benefits that its treescapes provide.