Another Huddersfield water course has turned orange.
Days after the River Holme in New Mill and Brockholes ran bright orange, a canal in Marsden today turned a similar colour.
Scientists say the discharge comes from minerals in old mine workings and is harmless to health.
Huddersfield Narrow Canal outside the Standedge Tunnel visitor centre turned orange yesterday.
It went a similar colour several weeks ago but returned to normal within a day or two.
Ellen Richards, supervisor at the visitor centre, said: “It’s certainly strange but we’re told it could be caused by iron deposits running off the hills.”
The tunnel doesn’t re-open after its winter season until March 8 but visitors walking in the area have been left puzzled.
“We’ve had lots of people asking us what it’s all about,” said Ellen.
After the River Holme ran orange, Huddersfield University scientist Dr Jeremy Hopwood explained the colouring was known as acid mine drainage and there was no health risk.
A spokesman for the Environment Agency said officials were investigating the canal.
He said it was not related to the River Holme contamination as they were on different water systems.
“There will be minimal environmental impact and it will wash through as groundwater levels disperse,” he added.
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