The ‘three legged stool’ of river health is habitat, water quality and water quantity. If any one of these legs is missing or unstable, then the river will not be in good ecological condition. Improving river habitat can make a river more resilient to pollution, floods and droughts but is not going to ‘fix’ very poor water quality or a river that dries up due to over abstraction.
Measuring the effectiveness of habitat improvement projects is not straightforward and not cheap. Monitoring needs to be carried out over a period of years to give any really robust data. The budget for long term monitoring is generally not available, but there is research that tells us about the effectiveness of habitat restoration.
The following paper was produced by the WTT’s Paul Gaskell and reviews the efficacy of restoration measures in relation to wild brown trout habitat:
Is habitat restoration effective?
Further reading
‘Does River Restoration Work’ Katie Whitlock, Salmo Trutta 2022
‘Looking after the youngsters’ — Juvenile trout habitat. Tim Jacklin, Salmo Trutta, 2011.
‘Does habitat enhancement work?’ John Spedan Lewis Foundation, Salmo Trutta, 2012.
‘Protecting & restoring your river’. Tim Jacklin, Salmo Trutta, 2012.
Effects of embankment removal . Hannah Clilverd et al, 2012; study of a WTT project.
Assessing the hydrogeomorphological effects of large woody debris in rivers: A study of both natural and restored wood in the River Blackwater, UK. (poster). Rebecca Ing, 2012; study of large woody debris and management recommendations