The River Habitat Survey (RHS) is a standardised method for assessing the physical structure and habitat quality of rivers. Developed in the 1990s, it combines a systematic field survey of a 500-metre river stretch with a computer database, enabling habitat quality to be measured by comparing a site against others of similar physical character. During a survey, over 200 data points are recorded across the channel, banks, and surrounding river corridor — capturing everything from substrate and vegetation to signs of artificial modification — building a detailed picture of a river's ecological condition.
To give these assessments meaning, an extensive network of baseline reference sites was established across the UK throughout the mid-1990s. Nearly 5,000 sites were surveyed across England, Wales, Scotland, Northern Ireland, and the Isle of Man, creating a geographically representative snapshot of river habitats nationwide. This baseline means that any RHS survey can be benchmarked against comparable rivers, allowing practitioners to identify how modified or degraded a site is — and how much potential it holds for restoration.
At the River Restoration Centre, RHS is a cornerstone of how we understand and work with rivers. We use it to characterise river reaches in terms of their;
RHS enables us to identify the pressures and potential impacts affecting these features at both reach and catchment scale. RHS data feeds into indices and models that our team have created that help us assess naturalness, predict impacts on species, and build a picture of habitat quality across entire catchments and beyond. Crucially, this evidence base allows us to prioritise where intervention and improvement work will have the greatest benefit — making RHS an essential tool for targeting restoration effort where it matters most.
The RRC runs training courses for those interested in becoming certified surveyors, see our available training course dates here
For more information on the method, its applications and resources available please check out the river habitat survey website
