11. Riverfly Monitoring along the Ash

Themes: Knowledge; Ecology and biodiversity


  • Learn more about the current state of the river
  • Identify specific problems facing the catchment
  • Improve water quality

Project description

This project will establish a new Riverfly Monitoring Group along the River Ash.

Riverfly monitoring is a national scheme whereby local volunteers are trained in how to sample for and identify a range of freshwater invertebrates.  Every month, pairs of volunteers will monitor the same site on their local river, building up a picture of the river's health and generating a score for the river each month.  If this score drops below a certain 'trigger level', it indicates there has been a pollution event and the Environment Agency will come and investigate.

Riverfly Monitoring is often descrived as a 'neighbourhood watch scheme for rivers'.

For more information please click here.


Project lead: Herts Chilterns & Middlesex Riverfly Hub
Project partners: Landowners and local volunteers
Funding source: Affinity Water, Natural England, Colne Angling Consortium
Project start: 2014
Project end: Ongoing
Contact for more information: This email address is being protected from spambots. You need JavaScript enabled to view it.
Riverfly monitoring in progress

Design by LTD Design Consultants and build by Garganey Consulting.