Which type of well yields more water: a dug well or a tube well?

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Which type of well yields more water: a dug well or a tube well?

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8 Answers

  1. In fact, it depends on the thickness strata of groundwater containing formations.

    The planning and calculation of a water supply well, are the strata of water influx the basis of all calculations. If these interchangeable deposits occur to an increased degree (eg, all 0.20m medium sand "with water", then 0.50m clay (without water) etc.) and are not powerful enough or even less than 1.0m thick, and not more than 5m thickness throughout the whole vertical profile, then you go, even with a drilled bore, with the drill diameter rather in the width, than in the depth !! 

    In some areas, bore diameters of 1000mm and larger are achieved, even in municipal water supply, worldwide. If this still does not prove sufficient for the calculated required water production, then it makes sense to create a shaft- or a dug-well. There are some cities where e.g. then also horizontal filter wells are built. These are manhole wells with a width of more than 2.5m and then horzotal well filter tubes are drilled into the water horizons ...

     

    Another example is the typical dugwell on islands, closed to the beach. There, you won't succes if you don't respect the strata of sweet water...drilled wells won't succed, you have to look for width.

    I hope, its clear enough :-)

    For any kind of questions or further help, do not hesitate to contact me.   

     

    So far good luck,

     

    Ulf

       

  2. Generally tube well, because it discharges water from the main aquifer but dug well produces leaching water.

  3. This is a relative question as open wells could generate as good a yield as a borehole, depending on the aquifer transmissivities. The Ranny wells - open wells with horizontal galleries could generate great yields if installed in alluvial gravel in a yielding aquifer. Certainly, wells could become less hygienic if not well protected, so for relative water quality, you expect a borehole to generate a better quality water.

  4. Nothing is so easy that one can say (a) or (b). Dugwell since there is virtually nil filtration. If you mean edible water, then the tube well is preferable. You need to consider water table and local climate. In monsoons, the water from the dugwell will be up. I think I have conveyed what I wanted to say. Engineers can never rely on multi-choice questions.

  6. Yield depends according to the strata and aquifer .Rate of filtration is directly proportional to the area of filtration.

  7. Common Misconception....

    Theoritically the "Yield" of an well is entirely dependent on the underlaying soil properties. Historically dug wells were being used by small communities with relatively small water demands and usually use to tap in the higher aquifers.

    Whereas with the advent of technology boring (using mechanical means) have rapidly became cheaper and affordable allowing users (local bodies/governments/ communities) to dig deeper into the earth and thus tap deeper and more than one aquifers. Tube wells are generally used to tap underground water to cater for higher water demand. Thus there is a common understanding that TWs yield more than the dug wells.

    It is the water demand that dictates the use of technology.

  8. Well types and the yield

     

    Dear Munchege, type of well do not have anything to do with the water yield. Water yield is depend on the type of aquifer. A well is merely an extraction structure. Choice of the type of a well will depend on factors like depth of the aquifer, availability of technology for its construction, cost and convenience. Dug wells are ideal groundwater extraction structure for shallow unconfined aquifers. These structures are preferred by farmers not only because these have considerable storage capacity but also can be constructed and deepened in phases using local expertise.A dug cum bore well is ideal when a confined aquifer occurs within a reasonable depth below the water table aquifer which is already being tapped through a dug well. When the existing confined aquifer is tapped through a vertical bore drilled at the bottom of the dug well, the chances are that the water level from the confined aquifer which occurs under hydrostatic pressure will rise and flow into the existing dug well. Water can then be pumped out conveniently from the dug well.Tube wells are most ideal for tapping high yielding confined granular aquifers occurring at considerable depths. Tube wells are also convenient for tapping groundwater from a thick unconfined granular aquifer with deep water table. Tube wells are also known to yield considerable quantity of water from sandstone and limestone aquifers occurring within multilayer formations and deep seated fractures in granitic rocks under favourable geological conditions.