Denbighshire floods: Culvert blamed for homes damage
3 September 2013 Last updated at 20:45 BST
Blocked culverts have been largely blamed for devastating flooding which affected 122 homes on a Denbighshire estate last year.
Independent investigators said screens around the culverts on Ruthin's Glasdir estate were poorly designed and did not comply with recognised standards.
They were not capable of being safely cleared in an emergency, the Denbighshire council report said.
The council was not blamed but it said lessons must be learnt.
The homes on the Glasdir estate were hit by an overflowing River Clwyd after heavy rain last November.
Environment correspondent Iolo ap Dafydd reports.