Weeding the Mill Leat at Cardiff Castle

Volunteers from CRG spent a beautiful summer’s evening removing a large amount of blanket weed from the mill leat at Cardiff Castle on yesterday evening  (Thursday 30 July).

The mill leat was re-flooded in 2013 for the first time in more than 30 years, as part a £5.6 million Bute Park restoration project, but had become covered in blanket weed.


The weed causes serious de-oxygenation of the water and prevents growth of submerged oxygenating plants. It also make circulating the water (which would improve oxygenation) impossible, as it clogs the pumps.

Two hours later…


As well as clearing the watercourse, four large bags of rubbish were collected from the surrounding area of the park — including a half-finished can of beer someone abandoned whilst we were there picking up the rest of the litter!

Watch CRG Volunteer Anthony Akhurst being interviewed about clearin up the leat on the Made in Cardiff programme “What’s Occurrin’ Cardiff?”.

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