Which method is NOT mentioned for stabilizing stream banks?

The method that is not mentioned for stabilizing stream banks is the use of concrete barriers. Stabilization of stream banks typically focuses on techniques that are environmentally friendly and that support the natural ecosystem, which concrete barriers do not effectively accomplish.

Concrete barriers often disrupt the natural flow of water and can lead to increased erosion and habitat loss, making them less desirable for stream bank stabilization.

In contrast, methods like live stakes, which involve planting live cuttings of native species, and branch packing, which uses cut branches to support sediment and plant growth, are recognized for their ability to enhance bank stability while promoting biodiversity. Crib walls, made from alternating layers of timber or stone, are also designed to provide structural reinforcement while allowing vegetation to grow, contributing to overall bank stability.

Therefore, concrete barriers stand out as a method that does not align with the sustainable approaches typically discussed in the context of stream bank stabilization.