Woody Debris

The placement of large logs ('woody debris') in the rivers has been one of the major techniques we have used to encourage the safe return of fish and other native aquatic species and to prevent erosion. The logs trap smaller fragments which promote the growth of plants, again improving stabilisation of the river banks.

We found that the best way to ensure that the logs stayed where we put them was to use an excavator to ram the logs up to two metres into the banks then to place large stones between the banks and the projecting logs, filling the gaps with gravel. Vegetation covers the area surprisingly quickly, leaving an attractive and stable bank.

Additional information