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BANGKOK 20 February 2019 06:38

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Yes ...very good post......now wheres my drilling machine...?

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Anyone have a rough idea how the cost compares to putting in a well. I'm pretty fed up with my water supply being turned off 12 hours a day. I've only a small garden so a bore hole would make a lot of sense.

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Anyone have a rough idea how the cost compares to putting in a well. I'm pretty fed up with my water supply being turned off 12 hours a day. I've only a small garden so a bore hole would make a lot of sense.

Depends on how deep and what they have to drill through to get to the water. We did one about two years ago, 2-3 metres top soil, 10 metres sandy clay then 30 metres of granite. Baht 336,000.

This followed a ground water survey which cost Baht 60,000 and we had a full geophysical report so we knew where and at what depth the water was. Get 20cum/day.

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Anyone have a rough idea how the cost compares to putting in a well. I'm pretty fed up with my water supply being turned off 12 hours a day. I've only a small garden so a bore hole would make a lot of sense.

Depends on how deep and what they have to drill through to get to the water. We did one about two years ago, 2-3 metres top soil, 10 metres sandy clay then 30 metres of granite. Baht 336,000.

This followed a ground water survey which cost Baht 60,000 and we had a full geophysical report so we knew where and at what depth the water was. Get 20cum/day.

Oh dear, a local Thai mentioned to my wife that a well wouldn't cost more than 10,000 Baht including the pump and cememt rings. Guess I'm back to plan A :o

Cheers for the information

geoffphket

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Baht10K = No No - not likely, but Baht360K - thats high but it was the 30 meters of granite that pushed that price high.

Look at around Bht50K for a 20 - 30m hole and Bht 100k for 50 - 100m.

Those are very rough figures - which are influenced a lot by what has to be bored through.

Just by way of interest that 30 meters thorugh granite - would I be correct in assuming it was bored through using not a mechanical drill but high pressure water jet (i.e. truck with very big compressor on the back)?

Tim

Edited by Maizefarmer

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For those Americans who are puzzled about what a bore hole is and what a well is.....in the US where I come from, a well is a hole in the ground that you make to pump water out of. If you drill a hole in the ground to do this then we call it a "drilled well" and if you use a digger to do this (clam shell, specially adapted back hoe, or a shovel and muscle) then its called a "dug well".....or course if you dig a pond to get water that's not considered a well at all and I won't try to define the difference between a "dug well" and a "dug pond"....but its usually obvious when you see them side by side!!!! Anyway, a "bore hole" is a "drilled well" in American lingo.

MaizeFarmer's talk was really good for drilling wells (makeing bore holes) when the water in your area is very deep...but in some areas (like where I live in the North) it is relatively near the surface and the conditions do not require a lot of the equipment and cautions he mentions. Before describing how my well in Thailand was drilled I want to say that I had a well drilled in the US and we did have one cable attached to the submersed pump but the pump itself was screwed onto the pipe that carried the water upward so hoisting the pump was actually done by lifting it by the pipe....and the one cable was the backup method......galvanized one inch pipe...very sturdy....the pipeing weighed more than the pump I think.

So...on to my Thai well experience. Where I live water can be reliably obtained in a seam of white sand that usually lies from 7 to 9 meters deep....but this seem of water bearing sand is pressurized somewhat so that when the well is drilled the water rises to about the ground water level as near as I can tell although I haven't monitored this throughout the year. Because of this we do not have a submersible pump....just a straight centrifugal pump mounted topside and pumping out of a one inch pvc pipe that goes down about 9.5 metres with a check valve (one way valve) on the bottom.

Before hiring the driller (a man who lives just up the soi) I did like MaizeFarmer said and checked out the other wells in the neighborhhod for depth, volume, and quality of water...luckily he had drilled them all...so everything checked out good...and then I found out that for 2,500 baht he would do all the labor AND HE GUARANTEED WE WOULD GET WATER OR HE WOULD DRILL AGAIN FOR FREE......well....this clinched the deal for sure.

The drilling....I picked the spot.....he brought a two wheeled walk behind tractor with a front mounted centrifugal pump, suction and discharge hoses, steel screw together pipes (about 1.5 or 2 inch...I forget) and the couplings to screw them together, and a home made digging bit he screwed onto the bottom of the first section of pipe. The diggin bit just had some steel projections around it so that it could pulverize the dirt around it so that the dirt could be removed......there is no (or very few) large rocks in the ground here....some gravel but mostly very hard clay and clay with gravel. He use only water (no slurry). He puts the digging bit on bottom end of the first pipe and the discharge hose from the centrifugal pump on the other end and pumps water through this while it is held vertically so that soon the bit is sitting in a puddle of mud....he and his helper start to twist that pipe (and the bit attached) back and forth causing the digging bit to pulverize the dirt which gets washed out by the water being carried down by the pipe. The excess water is collected in a sump hole which he dug by hand (10 minutes work) about two metres from the bore hole so the water emerging from the borehole flows into the sump and the pump suction line takes the water out of the sump....so you can see that the water gets recycled....the dirt coming up from the well settles out in the sump and gets removed as needed. So...he just keeps rotating the pipe back and forth and the weight of the pipe puts pressure on the digging bit and as dirt is removed and washed out by the water flow around the pipe the bit and pipe sink lower and lower....when the pipe is all the way down then another section is screwed on and the process continues. He monitors the dirt as it comes up with the water and when it comes up with white sand he knows he's hit pay dirt...errrr pay water! So then he goes a bit further and he pumps some water out to see if there is enough flowing in....and.....there wasn't......so he says...."mai dee...I'll come back tomorrow and try again!"!!...only he says this all in Thai......and......sure enough he came back the next day and we hit a good supply of water and so he then installed the 3 inch pvc pipe which I supplied for the casing (linging).....3 inch is the largest diameter he will do. He put some verticle slits in the end of the casing at the level where the water bearing sand was so the water could flow in quickly and a piece of wood on the bottom to keep dirt from being sucked up I guess....I was kind of worried about the wood but he said that all his wells were done this way and it is no problem...so OK...

I've never run out of water...I can run a strong hose as long as I want....BUT....you should be advised that the amount of water your well will deliver depends on the conditions where you live and just because I'm fortunate enough to have an abundant supply of water near the surface like this does not mean that you will get the same results...that's why MaizeFarmer started by saying to go check out what the wells in your area are like.

Chownah

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Good topic, I've "pinned" this.

I'll add my experiances. I've a 6 inch dia bore with a 2hp submersible pump I can pump around 10 cubic meter/hour (rough figs) based on how long it takes the tank to fill. My tank is about 16 cu/m and water is gravity fed to the house and farm, apart from when using the sprinklers (4hp pump). We had to go down about 60m

First just to add what others have said, go around your local area and talk to people who already have a bore or well (just for defination when I say a well I mean a big dug hole in the ground, a bore being 6-12 dia drilled). Find out how deep it is, who did it, how much it was ect.

I'm not sure if my driller used the slurry, I never even knew about it before reading tim's post. Ours also offered the "drill again if they did'nt find water" garentee. I would imagine this is only avalible in areas where they are pretty certian they are going to hit water. I can't imagine someone drilling through 30m of granite on the off chance.

Depth, size and type of pump will affect the price, I think ours was around 70,000 with the pump, concrete cap and fittings. my tank is made with 2m circular rings

It's not leaning honest, just looks like :o

Wells are much cheaper so I've heard but only sutible it the water is near the surface.

An other point is always get you well or bore dug in the middle of dry season when the water table is at the lowest, this is what I've been told anyway.

Edited by RamdomChances

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Yes RDC thats right VERY IMPORTANT POINT -

GET YOUR BOREHOLE (or well) DUG AT THE END OF THE DRY SEASON.

Thats when the water table will be at its lowest (i.e. get to the water then,is pretty much an insurance that you will have it all year round)

- had to leave someting out

Tim

Edited by Maizefarmer
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Yes ...very good post......now wheres my drilling machine...?

http://hydra-jett.com/

Anyone near Khon Kaen want to go in shares and give it a bash??/

I got a neighbour to drill bore hole for me in Lopburi (stone area). He guaranteed I only pay 4,000 baht if he gets water otherwise don't have to pay. He spent 3 days drilling with a honda motor and a tuktuk differential and gear box adapted for a carry around drilling rig. The system was light and portable and I am sure you could find someone in Thailand to make one up for you.

Might be cheaper than importing something in from America.

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We were charged 10,000 baht for a borehole that went down 40 metres about 8 years ago. At that time we had no electricity in the fields so we used the handplough with a belt on the pump method. Now we've got electricity we're using an electric pump.

I want to water about 7 rai of grass so I'm thinking of buying one of the big blue plastic tanks, raising it above the ground on a concrete base, then running underground pipes to the fields with valves at intervals on the surface. It seems better than buying 200 metres of green, plastic hose which will probably split within a few months with cows walking on it etc.

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Interesting read, and yes I know I am in the farming forum and I only use it for watering the garden, but what do I have if it is not a borehole?

Approx 2inch diameter hole (I assume it is lined) with an Hitachi electric pump which is attached to the usual blue plastic piping which is inserted in the borehole.

Drilled in an afternoon by locals who only charge if they hit water. Think they went down in excess of 30 meters and could not have charged much otherwise i would have remembered how much!

Is this just a smaller version of borehole with surface pump as opposed to submersible which is for more commercial use?

The water that comes out is only fit for garden as it has a heavy magnesium content (good for plants but no good for a cuppa!) If I went deeper would I hit water more suitable for domestic use or is it possible for current supply to be filtered so it is suitable for home use?

Thanks

TBWG :o

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Interesting read, and yes I know I am in the farming forum and I only use it for watering the garden, but what do I have if it is not a borehole?

Approx 2inch diameter hole (I assume it is lined) with an Hitachi electric pump which is attached to the usual blue plastic piping which is inserted in the borehole.

Drilled in an afternoon by locals who only charge if they hit water. Think they went down in excess of 30 meters and could not have charged much otherwise i would have remembered how much!

Is this just a smaller version of borehole with surface pump as opposed to submersible which is for more commercial use?

The water that comes out is only fit for garden as it has a heavy magnesium content (good for plants but no good for a cuppa!) If I went deeper would I hit water more suitable for domestic use or is it possible for current supply to be filtered so it is suitable for home use?

Thanks

TBWG :o

You can get relatively cheap Reverse Osmosis equipment now which will clean the water for you.

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