[PK2]

Tim Prosser, on 22 June 2012 - 21:43, said:

http://www.bbc.co.uk...-leeds-18559570

Flood sirens sounded in upper Calderdale.


I do have a reason for being interested in this area BTW. T'other half was involved in a flood alleviation scheme in upper Calderdale back in the late 1990s. All sorts of wheezes had to be incorporated, for example gravel traps (to try and prevent culverts becoming blocked with rocks during high flow). The old mills in places like Todmorden were built on top of the river and the culverts just aren't big enough, and deepening them is very difficult without having to underpin a significant number of listed buildings. As a result, when the flow is too high, the river flows down the street or the railway (and through the railway station at Walsden).

http://www.environme...ods/117980.aspx

Interesting to read the back story. Looks like a tough test for her work .
Given it sounds like a semi regular occurrence which makes me wonder if the station has adaptations for rapid recovery from the flood waters flowing through it?

[Dave K]

Official 48 hour rain totals of 50mm+ to 06Z on 23rd.

Stations:	Precipitation
Keswick (81 m)	108.0 mm
Bingley (267 m)	78.0 mm
Walney Island (14 m)	75.0 mm
Ballypatrick Fst (156 m)	74.2 mm
St Bees Head (123 m)	66.0 mm
Shap (249 m)	66.0 mm
Eskdalemuir (242 m)	61.0 mm
Machrihanish (10 m)	54.2 mm
West Freugh (10 m)	53.2 mm
IoM / Ronaldsway (AP) (16 m)	52.0 mm
Dundrennan (113 m)	52.0 mm

[Flatlander]

PK2, on 23 June 2012 - 05:53, said:

Interesting to read the back story. Looks like a tough test for her work .
Given it sounds like a semi regular occurrence which makes me wonder if the station has adaptations for rapid recovery from the flood waters flowing through it?

She only did some background ecology work - the modelling was done by an engineering company called JBA Consulting who do a significant amount of work on flooding for the EA and other parties.

Todmorden and Hebden Bridge have been subject to this ever since the industrial revolution that led to their development in the first place. The mills had to be on the river and the very steep valley sides meant that there was nowhere else to build but the valley floor (often over the top of the river as mentioned).

I'm not exactly sure what was built at Walsden but stopping the flow through the station was one of the things the scheme wanted to achieve. There were all sorts of plans proposed but the constraints of the geography were a major issue. If you read the scheme information you can see that they were hoping to reduce flooding from Walsden Water from a 1 in 7 year event to a 1 in 25 year event.

It is definitely a case of "I wouldn't start from here"...

This post has been edited by Tim Prosser: 23 June 2012 - 08:26

[Dave W]

The floods are top news story now .. a suggestion from radar accumulations that a few areas of Cumbria over Lakes have seen about 150mm in last 24 hours now but theres been widely 80mm..thankfully its generally stopped raining much there now

[Richie]

Air pressure rising at +0.4 mb/hr, and now reading 1013.7 mb.

Wind Southwesterly 20 Knots, gusting to 24 knots.

Rainfall only 0.1mm since midnight.

[Dave K]

Still more rain at the UKMO Keswick station to 12z, 121.0 mm from this event so far.

[Rich T 2]

Another tremendous pulse of rain came through Plymouth this evening. Steady light - moderate rain fell between 5 and 9pm, then shortly after that it hammered it down, giving a one hour total on PWS of 11.9mm. Since 10.30pm it's been mostly light rain again but there's still the odd heavier burst. Total in past 8 hours: 18.6mm.

[Dave W]

About 25mm in Essex/S Suffolk in places overnight .. and similar in last 18 parts of Somerset

[Dave W]

Winds gusted up to 49kt (56mph) at Hurst Castle about 0600

[Dave K]

Some 12 hour totals to 06Z on the 24th. BTW Keswick 131.0 mm in 72 hours.

Stations:	Precipitation
Liscombe (347 m)	28.0 mm
Shoreham (AP) (2 m)	24.0 mm
Dunkeswell Aerodr. (253 m)	21.0 mm
Camborne (88 m)	21.0 mm
Plymouth MtBatten (50 m)	19.0 mm
Cardinham (199 m)	19.0 mm
Leek (298 m)	18.0 mm
St Athan (49 m)	17.0 mm
Wattisham (89 m)	16.0 mm
Thorney Island (3 m)	15.0 mm
High Wycombe (205 m)	15.0 mm
Bournemouth (10 m)	15.0 mm

This post has been edited by Big Dave's Gusset: 24 June 2012 - 08:21

[Dave K]

From http://metofficenews...arts-of-the-uk/ with some non synop stations' data

Quote

Across this area there have been fairly widespread rainfall totals of about 25-50mm of rain in the past 24 hours – from 10am yesterday (22 June) to 10am this morning [ 23rd ].

However, some spots saw even more rain in the same period. Here are the wettest places in the past 24 hours:

Blencathra, Cumbria – 93.8mm

Keswick, Cumbria – 88.6mm

Stonyhurst, Lancashire – 74.4mm

Levens Hall, Cumbria – 58.2mm

Morecambe, Lancashire – 57mm

Walney Island, Cumbria – 55.8mm

Preston, Lancashire – 54.8mm

Myerscough, Lancashire – 52.2mm

Bingley, West Yorkshire – 50.2mm

[Rich T 2]

Further bursts of heavy rain here overnight to add to yesterday evening's downpour. A total of 27.4mm in 16 hours from 4pm till 8am.