Wet and dry

Thursday 9^th October

Eight members of the team attending today – with an equal division into two groups of four. One group had potentially wet work; whilst the other encountered dry conditions at all their work sites.

The wet work group, consisting of Jonathan. Polly, John and Martin, headed south. Late last Thursday we received a report from an adjacent landowner that water was flooding his field on the down (Cotswold) side south of Two Hedges Road. Severn Trent had attended earlier in the day, but found no evidence of a burst in the water main that runs under the field (and also under the railway by the abandoned bridge 41). The landowner also reported that the ‘Bonsai World’ stream was running strongly. This was perplexing, it was before the arrival of storm Amy, and no other watercourse in the area had suddenly increased flows. So our locally based team member went to investigate on Friday morning.

(Friday 3rd October) Debris washing down the Bonsai World stream to the grill on the new pipe under the footpath adjacent to the railway. [Photo by Jonathan]

 

 

 

 

Severn Trent had also returned on Friday morning, this time they did find a burst water main under New Road, the Woodmancote to Southam road. Water was cascading out of the break and finding its way into the ‘Bonsai World’ stream. The road was closed. Further visits, including by our Infrastructure Manager, confirmed that the recently installed pipe that takes the ‘Bonsai World’ stream under the footpath by the railway boundary was not leaking; there was some leakage from the crest ditch that this leads into, and the flooding in the adjacent field came from where this ditch (now a toe ditch at the bottom of an embankment) runs into the inlet of cross drain 40B. The amount of water entering the down side cess was not excessive , and there was no silt or other debris lineside. However, the volume of water was just too much for the toe ditch to cope with. Without heavy plant on site, we could not tackle any work to alleviate the situation until Severn Trent had fixed the burst main. This did not happen until Wednesday (8^th October) – apparently due to problems arranging alternative water supplies to Woodmancote and Southam.

(Friday 3rd October) Severn Trent find the spot where their water main had burst.  [Photo by Jonathan]

The ‘wet’ group managed to clear vegetation from the crest ditch to enable an inspection of the effects of the torrent of water. They also cleared some of the obstructions from the inlet of cross drain 40B and the toe ditch at its junction. We will return with a bigger group to continue with the clearance of the toe ditch. Dealing with the crest ditch is a more complex problem – as often the case, access for plant and bulk materials is difficult. We are evaluating a number of potential methods.

Scouring on the crest ditch caused by the torrent of water.  [Photo by Jonathan]

Temporarily replaced twin wall pipe sections in the crest ditch to reduce further scouring.  [Photo by Jonathan]

Meanwhile the ‘dry’ team, Peter, Nigel, Roger and Andrew, headed north to Toddington. First task was to collect the remaining items from the Drainage team exhibit at the Railway 200 weekend event. These were stored for safety in the First Response office – hence the requirement to have a First Responder with a key.

Then they headed trackside south past Hayles Abbey to commence the main job of the day. This was to clear and inspect culvert 17B, and cross drains 18A, 19A, 19B and 20A. None of those had water flowing through them; so this enabled some internal inspections (following our Confined Space working procedures). 17B had some pooling water in the bore, but the others were bone dry. Looking inside 20A is a very valuable and rare opportunity – none of the current team can recall this happening before. 20A was extended many years ago by butting up sections of GRP twinwall pipe against the old headwalls. We have always wondered how well the butt joints are fairing – now we know. The down (Cotswold) side inlet is not too bad; but the up (Malvern) side outlet will need some attention within a few years.

17B is the largest culvert we have; anything larger is a bridge. The horseshoe bore is tall enough to walk through, but it is rare to be able to do so without wellingtons or waders.

Adjacent to the high mileage end of bridge New Farmers Accommodation Bridge (19) is cross drain 18A. Both sides are chambers with the old style heavy concrete lids.

One of the smallest cross drains on the line is 19A - this is the up side inlet. Only in very wet conditions does water flow through it.

One man went to mow - Roger brushcutting to the fence line at 19A.

Peter clearing around the inlet of 19B. The orange posts are there to warn operators of robot flails. No signs of badger activity here this year.

Inside 20A, showing where the outlet extension GRP twinwall pipe butts against the original headwall and bore. 

As usual when clearing vegetation, the group also tackled mileposts and cess chambers. Additionally in a couple of places where the vacant track bed is wide and flat enough, we clear spaces to enable the road vehicles to be parked the required safe distance from the nearest running rail. Another odd job for today was the clearing of the gully covers under Old Farmers Accommodation Bridge (20). A unmetalled farm track passes under the line here so the result low point collects mud and silt.

Gulley under Old Farmers Accommodation Bridge (20). [Photo by Peter]

 

Autumn colours just beginning to appear - 2807 with an afternoon down train crosses Old Farmers Accommodation Bridge (20).

Finally, back at Winchcombe before our end of day cup of tea, we replaced the mess room whiteboard with the all line OS map on it; one of the items we had on display at the Railway 200 event.

Martin (l) and John become acquainted with our dumper prior to attending training in two week time.

Wildlife report: Despite not working by the River Isbourne today, two of our sightings were water birds. First was a heron on the roof of one of the houses adjacent to Winchcombe station; then we spotted a cormorant flying overhead at Didbrook. A little further south there was a very large flock of pheasants in one of the adjoining fields. We regularly see Robins when clearing ditches; but today one came very close at the outside benches by the footbridge at Winchcombe Station. Obviously plenty of crumbs there. Mammals spotted included muntjac and roe deer and a hare.