Sahara Groundwater

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Check Groundwater Using Satellites

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In every countries Groundwater located beneath the earth’s surface in phreatic layers or aquifers, for getting the water is done with the maximum care and precision, the usage of suitable techniques, to be able to dig or drill wells within the high-quality feasible locations and thereby keep away from pricey, discouraging failure. Let me explain from the beginning

What is Dowsing?

“Dowsing,” “water witching,” “divining,” and “doodle bugging” are all names for the practice of finding groundwater through strolling the surface of a assets whilst maintaining a forked stick, a pair of L-formed rods, a pendulum, or any other tool that responds while the man or woman actions above a place so that it will yield an adequate float of water to a drilled nicely

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individuals who exercise dowsing agree that groundwater moves in subsurface seams, veins, or streams that have to be intersected by the drill to produce an ok float of water. They trust that places where this water is a gift are surrounded by using forces with a view to produce a response of their tools. Forked sticks held in front of a dowser will be deflected in the direction of the floor, a couple of L-shaped rods held lightly in the dowser’s palms will go one another, and a pendulum suspended on a string will deflect from vertical because the dowser moves over a great place.

Why Do Landowners Hire Dowsers?

Drilling a water well can cost a lot of money. It is a main investment that many landowners are hesitant to make without professional consultation. They want to make sure that the well is drilled in a place where it’s going to produce water of a quantity and quality. This is why many human beings rent a dowser. They want to drill properly, near their house, in which the value of installing water lines and an electrical conduit can be minimum and in which a drilling rig can be pushed without difficulty.

What Do Hydrogeologists think of Dowsing?

Despite the fact that some dowsers have a document of frequently producing precise consequences, the Geological Survey reports that most geologists and hydrogeologists do not now suggest the exercise of dowsing. The country wide floor Water affiliation, in a function assertion, “strongly opposes using water witches to locate groundwater considering that managed experimental evidence really shows that the method is definitely without scientific advantage”

The nature of Underground Water

Most sparkling groundwater takes place in the pore spaces of sedimentary rocks and sediments. It has the capability to float laterally through these pore spaces and set up a “water table” that is normally horizontal or slightly sloping. If a landowner wishes a well drilled inside a hundred or so feet of a building site, nearly any place decided on will have similar capacity for yielding water to a well. Why? due to the fact the same kinds of rocks are commonly given below that small vicinity. locating and drilling into a good water delivery may be hard in regions underlain by means of igneous rocks consisting of granite and basalt.

These rocks do no longer comprise pore spaces via which water can waft. rather, the water has to flow through very narrow fractures within the rock. A well needs to intersect enough of those tiny fractures to produce beneficial amounts of water. It can be very hard to drill successful wells in some regions underlain through thick cavernous limestone. In those areas, wells that do not intersect a fracture or a cavern may not yield plentiful water. concerning those igneous and limestone regions, geologists and hydrogeologists consider that there is no scientific foundation for a dowser or a dowsing tool to have the potential to pick out a location in which a drilled well will intersect subsurface fractures or small caverns

How Do Hydrologists locate Water?

Most successful water wells are drilled without the advice of a hydrogeologist. local drilling businesses often have the experience of drilling hundreds or lots of wells in the areas wherein they perform. they have got found out through this revel in the parts of their provider vicinity wherein wells with good enough amounts of great water are generally encountered. Additionally they recognize regions wherein locating a good enough water supply can be challenging.

If a hydrogeologist is referred to as to decide a suitable drilling site, he or she can start by examining a geologic map. These maps show the sorts of rocks that exist below the landowner’s assets and their course of dip. additionally they offer information about the exclusive types of rock that exist within the place. a few styles of rocks are acknowledged to be correct producers of water, while others will no longer hold or yield beneficial water.

The dip of the rock units and the topography of the area can be studied to perceive the course of groundwater flow, capacity water recharge areas, springs, and discharge points. The intensity of impermeable rock can sometimes be determined, and those can serve as a lower restriction for drilling. All this information permits the hydrogeologist to broaden a three-dimensional version of the property that could define places which might be promising or those that should be averted.

The hydrogeologist will even seek facts about preceding wells drilled in the local vicinity. Most drillers keep a file of the styles of rocks penetrated and the amount of water produced for each well that they have drilled. This statistics is very beneficial in figuring out the chance of drilling fulfillment on a close-by property.

Hydrogeologists frequently take a look at aerial pictures in a difficult area. Aerial snap shots frequently display linear capabilities that could indicate the presence of fracture zones inside the bedrock. Those regions regularly yield abundant water to wells.

The usage of the information described within the studies above, hydrogeologists base their hints on

1) the traits of the land

2) characteristics of rocks underneath the site

3) results from previous drilled wells

4) recognized standards of groundwater movement. They agree with that this form of facts is more beneficial for siting a well than how a stick, a twine, or a pendulum responds to an unknown force

Modern techniques

These techniques make it viable to discover aquifers with greater precision, and they are much more green in assessing their size, quantity, best and sustainability.


Analyzing maps and local vegetation gives a primary indication of the presence of water. Inside the case of huge-scale investigations, an international geological analysis can even be performed through the interpretation of satellite images or aerial photos. These can highlight the presence of the important geological outlines liable to give rise to fractures with an identifiable route or outcrops.

Hydro geophysics

Geophysical strategies are actually the primary methods of investigation and detection of underground aquifers. The technique chosen in particular depends on the geological context. With those methods, we strive to take a look at the soil’s physical residences and particularly its electric properties. The aquifers are most often trapped between rock layers. All rocks conduct a certain quantity of electricity, but their conductivity and resistivity range according to their kind : compact rock, dry rock, fractured rock, moist rock, permeable structures or impermeable ones. a fabric’s electric resistivity is its potential to oppose the waft of electric current.

These methods are for this reason based on the capability of the soil or rock to conduct electricity and the size in their conductivity or resistivity (the alternative of conductivity).From these measurements, the sort, length and first-class of the aquifer is deduced and unique, or perhaps only presumed, but with a high possibility.

There are essential kinds of strategies, which might be once in a while used successively :

a) The measurement of electrical resistivity and the usage of direct current.

It is composed in sending direct modern into a geological structure on a given site (50 to four hundred volts relying on its resistivity – conductivity) the usage of electrodes (A and B).There are several possible electrode arrays (Wenner, Schlumberger, four terminals, and so on.).The area investigated must not be too huge and should be pretty flat and free of homes which may also reason interference and might make it not possible to have AB strains of the specified duration (over 300m).

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b) techniques for measuring this reactivity via magnetic approach

simpler to implement, including the Slingram and VLF methods, these techniques degree electromagnetic indicators because of magnetic induction phenomena. They don’t want any touch with the ground and therefore no electrodes. They make it viable to measure the soil’s reactivity to electromagnetic excitation. however, they can not be used on all forms of grounds or for aquifers over 20 meters deep, or maybe less. Their use seems to have diminished.

That is an immediate water detection approach. It consists in sending electric powered currents into the ground, then measuring the indicators emitted by way of the nuclei of hydrogen atoms in water molecules. It calls for sophisticated equipment which include proton magnetometers that may measure electromagnetic fields ; their recordings can be interpreted on web site and, most significantly, the amount of groundwater present within the rock may be deduced in a few seconds.

The isotope method

This technique is in particular useful for tracing the water flow and to estimate the age of the groundwater. We realize that the phreatic layer is renewed by the infiltration of water through the influx vicinity, wherein the aquifer’s geological structure is uncovered to the surface. Investigations the use of the isotope method can often give beneficial warning signs.

If there are infiltrations, they can be detected and assessed by analysing the variations within the isotope content of the damp soil above the phreatic layer. The most used isotopes are tritium, deuterium, oxygen 18 and carbon 14. The outcomes have shown that this method is reliable and promising, mainly if it is used with the bodily fashions describing the water waft.


Many successful wells are drilled without the value of a dowser or a hydrogeologist. The driller frequently has plenty of revel in the location being drilled and is aware of if the rocks in that region generally yield beneficial portions of water.

whilst professional consultations are required the landowner to make a choice. must the assignment costing hundreds of bucks be primarily based upon clinical information about the rocks beneath a site, their water-yielding houses, and recognized standards of groundwater drift; or, should it be primarily based upon a forked stick and an unexplainable pressure?

source: https://geology.com/articles/water-dowsing/


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