Marazion Flooding

[whole diary]

[GBM]

Another flooding at Marazion.
Issued at 09h49 today.
Cancellations to services between Penzance and Par
Due to flooding between Penzance and St Erth the line is blocked. Disruption is expected until 12:00 12/12.
Train services between Penzance and Par will be cancelled, delayed or revised. Penzance will not be served.
Customer Advice
-
What has happened?
-
The line has flooded at Marazion, between St Erth and Penzance.
-
What are we doing about it?
-
Network Rail are monitoring the water level. Trains from Plymouth towards Penzance may terminate short at Par, Truro or St Erth and will start back from those locations. Local bus operators are being contacted and rail replacement transport requested, more information to follow.

Was it a few days ago it flooded there and caused many local headaches?
Never noticed it flooding there before, so what has changed recently I wonder.

[GBM]

Also wondering if my assumption is right, in that there is only one crossover on the main line between Truro and St Erth?
Very poor in view of the Marazion flooding incident(s).

[John D]

Also wondering if my assumption is right, in that there is only one crossover on the main line between Truro and St Erth?
Very poor in view of the Marazion flooding incident(s).

Actually none between them for about 20 miles, except the crossovers at Truro and St Erth. (see pages 118-122 on link)
https://sacuksprodnrdigital0001.blob.core.windows.net/sectional-appendix/Sectional%20appendix%20full%20PDFs%20December%2025/Western%20&%20Wales%20Sectional%20Appendix%20December%202025.pdf

[a-driver]

Another flooding at Marazion.
Issued at 09h49 today.
Cancellations to services between Penzance and Par
Due to flooding between Penzance and St Erth the line is blocked. Disruption is expected until 12:00 12/12.
Train services between Penzance and Par will be cancelled, delayed or revised. Penzance will not be served.
Customer Advice
-
What has happened?
-
The line has flooded at Marazion, between St Erth and Penzance.
-
What are we doing about it?
-
Network Rail are monitoring the water level. Trains from Plymouth towards Penzance may terminate short at Par, Truro or St Erth and will start back from those locations. Local bus operators are being contacted and rail replacement transport requested, more information to follow.

Was it a few days ago it flooded there and caused many local headaches?
Never noticed it flooding there before, so what has changed recently I wonder.

It hasn’t flooded.

Water levels at a bridge in the Marazion area has breached the closure mark. A diver is required to check the structure and assess the scour risk. 

Either this is something Network Rail has recently introduced or the river is no long dredged resulting in it no longer having the capacity it once did.

[Mark A]

It'd be good to know more about this and what has precipitated it.

Mark

[ChrisB]

It'd be good to know more about this and what has precipitated it.

Think you answered your own question

[Mark A]

Checking the tide times there, this did happen around the time of a high tide. That aside, I was wanting more on the recent practice of closing lines when the water beneath them reaches a certain height because of scour risk. Presumably this is certain bridges, as it's not water depth that may scour foundations, it's the rate of flow, and its common for structures to be immersed but not see any particular rate of flow in the water beneath them. (Not trivialising this, 'cos, Glanrhyd and a host of other examples including that poisonous little rivulet north of, is it Carr Bridge on the Highland Main Line?)

Oh, and {fx: raises a glass to the people who set that central pier in the Avon on the bridge next to Bath Spa station.}

Mark