Hi @assoaljomaily1589 there is no method to detect groundwater directly, except perhaps with magnetic resonance. The magnetic method is looking for changes in the earth's magnetic field so you can use it it you are looking for e.g., igneous dykes if you want to site wells just upstream of them. By electrical method you are probably thinking of resistivity which is the best way to map aquifers. You can use resistivity profiling, resistivity imaging, VES and also electromagnetic methods like TDEM. You can find several videos on resistivity & groundwater exploration in my Hydrogeology 101 playlist. All the best, Andreas
@@GeosearchInternational thank you Mr Andreas ..I have many friends who want to dig wells, but the nature of the layers is gypsum and karst layers, and it is difficult to find water everywhere, and when we dig more than one well, we do not find water except by luck. So one of my friends suggested that he buy a device to detect groundwater from a depth of 10 - 70 meters...that's why I asked you...knowing that I major in geophysics
Hi Andreas, just noticed the diameter of this well at 12". Irish drillers usually drill 6" and I understood from theory that an 8" well can increase the yield by letting more water into the well - water doesn't compress and it is analogous to fans leaving a stadium through a small gate, a wider gate lets more through. However I am always told (by drillers) that this is not correct! Perhaps I have had a wrong idea for years...?
Hi George, the theory is that if you double the well diameter you improve well efficiency by only 10%, so you need to compare the total energy savings over the life of the well with the increased costs. Normally you should drill at the smallest diameter. This is determined by the pump diameter, which controls the casing diameter which in turn controls the borehole diameter. You need space to install the pump and the gravel pack. So 12” borehole is for 8” casing which can accommodate a 6” pump. Things can change for deeper wells which may need more space for the pump. Hope that makes sense - I will make a video about this if I get some time. All the best, Andreas
@@GeosearchInternational Many thanks Andreas, so I was in the wrong about that and for quite a few years too! I'll have to apologise to a few drillers now :-)
I have a deep respect for drillers and they have taught me so much knowledge based on their experience. It’s good if it matches the theory as well & can always be discussed over a Guinness! All the best, Andreas
It is really useful for us thanks for hard working
Thanks and welcome Eng. Nisar! All the best, Andreas
Really appreciated ur efforts
Thanks so much!!! All the best, Andreas
Hello Mr.Andreas good job
Thanks so much! All the best, Andreas
We want a video about the difference or which is better between the magnetic method or the electrical method to detect groundwater..thanks from Iraq
Hi @assoaljomaily1589 there is no method to detect groundwater directly, except perhaps with magnetic resonance. The magnetic method is looking for changes in the earth's magnetic field so you can use it it you are looking for e.g., igneous dykes if you want to site wells just upstream of them. By electrical method you are probably thinking of resistivity which is the best way to map aquifers. You can use resistivity profiling, resistivity imaging, VES and also electromagnetic methods like TDEM. You can find several videos on resistivity & groundwater exploration in my Hydrogeology 101 playlist. All the best, Andreas
@@GeosearchInternational thank you Mr Andreas ..I have many friends who want to dig wells, but the nature of the layers is gypsum and karst layers, and it is difficult to find water everywhere, and when we dig more than one well, we do not find water except by luck. So one of my friends suggested that he buy a device to detect groundwater from a depth of 10 - 70 meters...that's why I asked you...knowing that I major in geophysics
@@assoaljomaily1589 If you are only interested in shallow wells (
@@GeosearchInternational array (VES)@@GeosearchInternationalarray @@GeosearchInternational high condictivity@@GeosearchInternational
Hi Andreas, just noticed the diameter of this well at 12". Irish drillers usually drill 6" and I understood from theory that an 8" well can increase the yield by letting more water into the well - water doesn't compress and it is analogous to fans leaving a stadium through a small gate, a wider gate lets more through. However I am always told (by drillers) that this is not correct! Perhaps I have had a wrong idea for years...?
Hi George, the theory is that if you double the well diameter you improve well efficiency by only 10%, so you need to compare the total energy savings over the life of the well with the increased costs. Normally you should drill at the smallest diameter. This is determined by the pump diameter, which controls the casing diameter which in turn controls the borehole diameter. You need space to install the pump and the gravel pack. So 12” borehole is for 8” casing which can accommodate a 6” pump. Things can change for deeper wells which may need more space for the pump. Hope that makes sense - I will make a video about this if I get some time. All the best, Andreas
@@GeosearchInternational Many thanks Andreas, so I was in the wrong about that and for quite a few years too! I'll have to apologise to a few drillers now :-)
I have a deep respect for drillers and they have taught me so much knowledge based on their experience. It’s good if it matches the theory as well & can always be discussed over a Guinness! All the best, Andreas
@@GeosearchInternational Great idea - thanks again!, George
Wellcome! All the best, Andreas