Trees like willow can be used to strengthen the banks of waterways. The specialist techniques used to do this are high risk, and bad weather conditions can make them even more dangerous.

Approved code of practice for safety and health in tree work -Part 3: river and stream operations provided guidance on general safety rules, safety clothing and equipment, noise, safe use of chainsaws and mobile plant, tree felling, lopping and layering, tree slotting and trenching in river and stream work.