Development of an Ecological
Status Indicator for Rivers

WRc provided statistical advice to support the development of a new Ecological Status Indicator (ESI) for monitoring long-term changes in the status of river water bodies. We devised a statistical approach to test for changes in the ESI metric through time, determined the optimum sampling strategy and minimum monitoring effort required to deliver the required precision and confidence, and produced a simple tool to calculate the ESI.

Simon Clarke head of catchment management Tel: +44(0) 1793 865000