Difference between revisions of "Artesian Condition"

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'''Artesian Condition''' If a [[well]] is drilled into a confined [[aquifer]], the water can rise above its level in the aquifer because of extra hydrostatic (fluid) pressure, and it is called an artesian condition. Alternatively, when an aquifer is wedged between layers of relatively impermeable materials and consequently under pressure, it is said to be under artesian condition. The water in an artesian system may or may not rise all the way to the surface and some pumping may be necessary to bring it to the surface for use. In such a condition, rather than describing the height of the [[groundwater table]], geologists refer to the height of the potentiometric surface, which represents the height to which the water';s pressure would raise the water if the water were unconfined. This level will be somewhat higher than the top of the confined aquifer where its rocks are saturated, and it may be above the ground surface.  
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'''Artesian Condition''' If a [[well]] is drilled into a confined [[aquifer]], the water can rise above its level in the aquifer because of extra hydrostatic (fluid) pressure, and it is called an artesian condition. Alternatively, when an aquifer is wedged between layers of relatively impermeable materials and consequently under pressure, it is said to be under artesian condition. The water in an artesian system may or may not rise all the way to the surface and some pumping may be necessary to bring it to the surface for use. In such a condition, rather than describing the height of the [[Groundwater Table|groundwater table]], geologists refer to the height of the potentiometric surface, which represents the height to which the water's pressure would raise the water if the water were unconfined. This level will be somewhat higher than the top of the confined aquifer where its rocks are saturated, and it may be above the ground surface.  
  
 
Artesian conditions depend upon certain requirements: a) an inclined aquifer whose lower end is buried and upper end is exposed, b) impervious layers above and below the aquifer that prevent leakage and allow hydrostatic pressure to develop, c) precipitation that infiltrates the aquifer at its exposed end, d) a spring or well that allows the water of the aquifer to discharge.  
 
Artesian conditions depend upon certain requirements: a) an inclined aquifer whose lower end is buried and upper end is exposed, b) impervious layers above and below the aquifer that prevent leakage and allow hydrostatic pressure to develop, c) precipitation that infiltrates the aquifer at its exposed end, d) a spring or well that allows the water of the aquifer to discharge.  
  
An extensive aquifer under artesian conditions is found in the [[ganges floodplain]] and in the [[atrai basin]]. In Rajshahi graben, Rajshahi-Charghat-Joypurhat horst and Rangpur-Lalmonirhat layered aquifers also show that they are under artesian condition. The piedmont deposits of [[chittagong]], the Meghna estuarine floodplains of [[noakhali]] and the northern districts are not considered favourable for extensive [[groundwater]] development. Aquifers in the area are under artesian condition. At places semi-confined conditions exist but leakage from the overlying water-bearing formations is negligible. [Md Sazzad Hossain] [Hossain, Md Sazzad  Professor of Geology, Dhaka University]
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An extensive aquifer under artesian conditions is found in the [[Ganges Floodplain|ganges floodplain]] and in the [[Atrai Basin|atrai basin]]. In Rajshahi graben, Rajshahi-Charghat-Joypurhat horst and Rangpur-Lalmonirhat layered aquifers also show that they are under artesian condition. The piedmont deposits of [[Chittagong District|chittagong]], the Meghna estuarine floodplains of [[Noakhali District|noakhali]] and the northern districts are not considered favourable for extensive [[groundwater]] development. Aquifers in the area are under artesian condition. At places semi-confined conditions exist but leakage from the overlying water-bearing formations is negligible. [Md Sazzad Hossain]
  
 
[[bn:আর্তেজীয় অবস্থা]]
 
[[bn:আর্তেজীয় অবস্থা]]

Latest revision as of 22:00, 1 September 2021

Artesian Condition If a well is drilled into a confined aquifer, the water can rise above its level in the aquifer because of extra hydrostatic (fluid) pressure, and it is called an artesian condition. Alternatively, when an aquifer is wedged between layers of relatively impermeable materials and consequently under pressure, it is said to be under artesian condition. The water in an artesian system may or may not rise all the way to the surface and some pumping may be necessary to bring it to the surface for use. In such a condition, rather than describing the height of the groundwater table, geologists refer to the height of the potentiometric surface, which represents the height to which the water's pressure would raise the water if the water were unconfined. This level will be somewhat higher than the top of the confined aquifer where its rocks are saturated, and it may be above the ground surface.

Artesian conditions depend upon certain requirements: a) an inclined aquifer whose lower end is buried and upper end is exposed, b) impervious layers above and below the aquifer that prevent leakage and allow hydrostatic pressure to develop, c) precipitation that infiltrates the aquifer at its exposed end, d) a spring or well that allows the water of the aquifer to discharge.

An extensive aquifer under artesian conditions is found in the ganges floodplain and in the atrai basin. In Rajshahi graben, Rajshahi-Charghat-Joypurhat horst and Rangpur-Lalmonirhat layered aquifers also show that they are under artesian condition. The piedmont deposits of chittagong, the Meghna estuarine floodplains of noakhali and the northern districts are not considered favourable for extensive groundwater development. Aquifers in the area are under artesian condition. At places semi-confined conditions exist but leakage from the overlying water-bearing formations is negligible. [Md Sazzad Hossain]