Tree Risk Assessment Survey
Quantitative Tree Risk Assessment (QTRA) Method
QTRA is a standardised method of assessing the risk presented by trees. It is "Target" based, which means it considers the object or person the tree could harm as the focus. For example a tree that is 100 miles from civilisation would not pose a risk to anyone. Put that same tree next to a busy road and suddenly it does. If there is nothing or no-one to harm then there is no risk. Obviously there is a grey area between those two extremes and that is where this method comes in.
It uses standardised ranges including target type (how busy a road is or how much the repairs would cost), the size of the tree, and the probability of it failing in the coming year. These are put into a specialised calculator which is then compared to guidance issued by the HSE (Reducing Risks: Protecting People 2001) which advises on probability thresholds for the risk of death to workers and members of the public to determine if the overall "Risk of Harm" is acceptable or not.
For more information about QTRA please visit www.qtra.co.uk.
Tree Risk Assessment
This survey is similar to the Tree Condition Survey but focuses solely on the risk the tree presents. As with the Tree Condition Survey this would fulfil your duty of care as a tree owner under The Occupiers Liability Act 1984.
Tree Risk Assessments can provide tree managers and owners of the cost benefit analysis of risk mitigation works. There is no point spending £300 on tree work to save a £60 fence panel for example. This can act to guide budgeting on larger sites and focus the work on higher risk areas.
We can provide a Tree Risk Assessments at sites all over the South West of the UK, including Somerset, Bristol & Bath, South Gloucester and South Wales