Depth indications

for matters relating to dowsing for water supplies including wells, boreholes, heat pumps and other services.

Depth indications

Postby griff » Tue Jul 18, 2006 9:51 am

When dowsing for borehole sites, I often experience the first indication at quite a shallow depth, however, when drilling this sometimes proves to be dry and the first cut may be deeper, verifying the second indication. On many occasions, when visiting the site the following day, the first indication proves to be the semi or sub-artesian recovery rest water level.
Has anyone else experienced this?. If so, I would be interested in your comments.
griff
 
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Location: South Pool Kingsbridge Devon UK

Re: Depth indications

Postby Old Bob » Tue Nov 03, 2009 11:32 am

I try to find the top and bottom of the water strata and quote water may be at X ft taking the average then go on to say bore will need to go a bit deeper to pressure the water into the bore casing. A driller can block off a stream with the bore mud so a bit deeper gives the water some where to go. Some streams are in shale, broken rock or gravel which can be any thickness. I dowsed one bore that had 70 ft of solid granite which raised a few eye brows only to break through to beautiful water. Some times the water will be under some pressure and come up the bore many meters, which is some thing unknown to me. My hand ache when the water quality is poor, does anyone else get that?
Old Bob
 
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Re: Depth indications

Postby griff » Fri Nov 06, 2009 5:19 pm

Hi Bob

A similar situation occurred when, dowsing for a bore in the Lower Devonian, Meadfoot Slates, Torcross Series the first course indication was at 10 feet and the only other indication at 90 feet and the aggregate indicated yield over 300 gall/hr. The client owned a small area of woodland of approx. 1 acre surrounding his house and a further acre of woodland where a second drilling site was selected on the other side of the road passing the property. On the second site, trees would need to be felled to allow access for the rig and equipment and the road crossing for cables and delivery pipe would be subject to local government approval.
Although the second site indicated three courses and over 400 gall/hr, the client wished to trial bore the first site nearer the house. I agreed to this, having given a No Water, No Fee warranty on the quote. The drillers duly arrived, at 12 feet the risings were slightly damp for a foot or so and then dust until 90 feet. The drillers wanted to abandon the bore and go home but I persuaded them to return in the morning. Next day they continued drilling and about five gallons of water was blown out. At 95 feet, a large quantity of water clearing rapidly was encountered.and a 20 foot sump drilled. The hammer was lifted some 3 feet and air blowing yielded a bucket-measured 800 gall/hr for an hour and a half. On withdrawing steels, the water level overtook the drillers. Casings were inserted and grouted and the water level was at 20feet from GL when we left. The following morning the recovery water level was 11 feet below GL.

Regards Griff.
griff
 
Posts: 175
Joined: Sat Jun 10, 2006 12:04 pm
Location: South Pool Kingsbridge Devon UK

Re: Depth indications

Postby Harri » Sat Nov 07, 2009 8:30 pm

Hi,
I need to keep records for longer to analyse my own findings, but, I've been advised that; using the Bishop's rule; different geology affects how accurate depth indications are. For instance I was told to expect the depth to be greater than where I get a signal if in a shale area. Has any one found similar differences in different rock? I'm still practicing, trying to get to dowse the site before going out again with the experienced dowser, to see if our results match without the worry of my conformation of what he finds being because of some sort of auto-suggestion.
Harri
Harri
The most beautiful thing we can experience is the mysterious. It is the source of all true art and all science.
(Einstein)
Harri
 
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Location: Anglesey

Re: Depth indications

Postby Old Bob » Tue Nov 10, 2009 10:49 am

Hi Griff I don't use the shadow method for depth, as I have worked in building it is easy to use just ft. or meters. Just chant in my mind the depth and imagine the distant (eg 40 meter 41-- 42 or what ever till a response of the rods. Have been able to get close each time, then add extra for water reserve. Of cause I do it a number of times as a check before I open my big mouth. As I said before I have not been able to work out if the stream is under pressure as to how far it will come up the bore, think it's because our rain fall varies so much across the year. One bore the water seemed to dowse as ok but it had a coal taste, (didn't ask that question.) The client was happy and it was safe for stock. That bore was way below sea level and only about 300 meters from a sea water lake. My biggest worry was salt and didn't expect a coal seam.
Old Bob
 
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