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Mine Exploration Forum

Author High Groundwater Levels
Peter Burgess

Joined: 01/07/2008
Location: Merstham. Or is it Godstone ...... ?

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High Groundwater Levels
Posted: 07/03/2014 18:39:08
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What have you witnessed in the last few months in the way of unusually high groundwater levels? Almost uniquely, we have the opportunity to directly witness water levels underground after all the high rainfall amounts since the end of 2013. I have been watching rising water levels in Surrey, which are now falling again, and trying to make sense of what we have seen.

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Graigfawr

Joined: 04/11/2009

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High Groundwater Levels
Posted: 07/03/2014 18:45:56
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Refer to Hendre Spar Mine thread? IP: 92.19.206.180
royfellows

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Joined: 13/06/2007
Location: Great Wyrley near Walsall

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High Groundwater Levels
Posted: 07/03/2014 20:49:36
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Cwmystwyth Lefel Fawr at its seen before max, Frongoch about an inch, not been in anywhere else.
Can think of a few places I would't really want to go

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AR

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Joined: 07/11/2007
Location: Knot far from Knotlow in the middle of the Peak District

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High Groundwater Levels
Posted: 07/03/2014 21:29:33
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Great Masson lake- on the showcave side flooded right up to the steps and on the other side, several feet deep where I recall walking across a shallow puddle to look down into the connection a couple of years ago!

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staffordshirechina

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Joined: 15/11/2009
Location: North Staffordshire

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High Groundwater Levels
Posted: 07/03/2014 21:33:57
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In my experience, towards the East coast, it has been a dry winter by comparison with previous years. IP: 86.140.3.8
Tamarmole

Joined: 20/05/2009
Location: Tamar Valley

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High Groundwater Levels
Posted: 07/03/2014 21:39:07
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In the George & Charlotte (Tamar Valley) water levels have been comparable to other years but certainly no worse. IP: 86.159.139.156
Peter Burgess

Joined: 01/07/2008
Location: Merstham. Or is it Godstone ...... ?

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High Groundwater Levels
Posted: 07/03/2014 22:15:24
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The Chaldon quarries have been more seriously flooded than I have ever seen. The last time was 2000/2001 I think, and nowhere did the water reach the roof. The lowest areas have been flooded to the roof in a few places this year so that's a rise of a minimum of 2 metres, which may not sound a lot, but in a drift working following the dip of the stone bed north at up to 10 degrees, that is a large area full of water.

The water rose steadily throughout January and accelerated into February. It stopped rising quite quickly and is now falling quickly. It appears to be responding very quickly to rainfall levels.

We have only had the chance to visit Godstone twice, once in mid January and once in mid February. The springs in the quarry floor were flowing very strongly in January, but there were no floods evident, although this was probably only because the northern and lowest areas have been inaccessible since the 1930s. In mid February the water was evident south of the blockages, and it will be interesting to see at the end of the month whether the water has gone down as it has at Chaldon, or whether, as I suspect, the levels continued to rise and are still high, as I think the water level responds much more slowly to rainfall here.

There is a long-standing tradition to link the rising water in Godstone with the rise of the Caterham Bourne, which appeared about mid February and continues to flow strongly, disrupting life in the Caterham Valley as I write.

As the Bourne rises from the chalk, in an aquifer above the impervious chalk marl (lowest bed of the lower chalk), and the quarries are in the upper greensand which underlies the chalk marl, I find the idea that there is a direct connection between the flooded quarries and the Bourne difficult to accept. Of course both are due to periods of heavy winter rain, so there is a connection, but I doubt the water flows from the quarries northwards to the Bourne rising. The water would be flowing from one distinct aquifer to another.




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SRJ underwater mining

Joined: 31/01/2014

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High Groundwater Levels
Posted: 11/03/2014 19:50:13
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In the workings where we do the majority of our work, we have seen over the last couple of months an increase of a good 6in of extra water running through the entire sett which has been running constantly since around christmas, should be going again on friday to see how a week of dry weather has affected the water, then starts the process of repairing the damaged IP: 89.242.53.183
Tocsin

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Joined: 06/09/2010
Location: Kent

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High Groundwater Levels
Posted: 15/03/2014 00:14:21
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Not a mine, but the Wartling radar bunker I look after has seen unprecedented leaks in places where we have never seen water come in before and much higher flows on the known leaks. Total rise this winter is about 40cm which is more than the six year average measured back to 1976. This equates to about 600,000 litres.

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