1. Forest Research. (2021).Slowing the flow at pickering—photo gallery—examples of large woody debris dams.https://www.forestresearch.gov.uk/research/slowing-the-flow-at-pickering/slowing-the-flow-at-pickering-photo-galleries-and-maps/slowing-the-flow-at-pickering-photo-gallery-examples-of-large-woody-debris-dams/
2. Newcastle University. (2015).'Kerplunk' system slows the flow.https://www.ncl.ac.uk/press/articles/archive/2015/08/kerplunksystemslowstheflow.html
3. North York Moors National Park. (2015).Slowing down.https://northyorkmoorsnationalpark.wordpress.com/2015/09/14/slowing-down/