Since March 2015, we have been working in the Calder Valley to understand the river network and how it reacts to rain fall in an attempt to reduce the peak flow in our towns and villages in the Calder Valley. As part of this, we have been conducting River Surveys all along Hebden Water, including at Hardcastle Crags, Crimsworth Beck and at Nutclough.


Using this data and local knowledge, work has now started on our ‘Log Jam’ / Leaky Woody Dams (LWD) project at Hardcastle Crags with The National Trust. We are having great fun building these LWDs, and gully stuffing using materials from the Crags themselves that are scheduled to be felled as part of The National Trust woodland management plan’.

The BBC have been featured us HERE in the work we are doing here in the valley.


We have had many new volunteers working with us to Slow The Flow in Hardcastle Crags and we have made a significant contribution to how rain water now moves through this small part of the catchment.  We meet twice a month, usually on a weekend.  We are also working with larger corporate groups during the week so if your company or organisation would like to get involved,  please contact us.

For upcoming volunteer dates please see the volunteers page.

The winch being used to move a felled 150 year old oak trunk into a dam across a gully


Leaky dam

End clamps used for grip at the ends of trunks and branches

For more information, take a look at our blog posts on the subject:

A Natural Flood Management Pilot Project at Hebden Water and Crimsworth Dean Beck, Hardcastle Crags, Hebden Bridge, West Yorkshire

Helping Ourselves (Part 2); The importance of river surveys and a pilot project for Hardcastle Crags

Engineered Leaky Woody Dams (WeLD’s) on Rock Stream Beds

Part 2. Engineered Leaky Woody Dams (WeLD’s) on Soft Soil Stream Beds

Our river surveys have been an integral part of getting to this stage – find out more about them, and how to get involved, here.

Hebden Water at Midgehole, next to the BluePig