Bored wells are tubular wells drilled into permeable layers to facilitate abstraction of groundwater through suitable strainers inserted into the well extending over the required range or ranges of the-water bearing strata. There are a variety of methods for drilling such wells through different soils and for providing suitable strainers with a gravel shrouding where necessary. Bored wells useful for obtaining water from shallow as well as deep aquifers are constructed employing open end tubes, which are sunk by removing the material from the interior, by different methods. The deeper strata are usually more uniform and extensive than strata near the surface, so that in regions already explored, deep wells can be sunk with far more certainty of success than is usually the case with shallow wells.
Methods of drilling bored wells
In hard soils •the hydraulic rotary method •the percussion method
In soft soils, •Hydraulic jet method, •Reverse rotary recirculation method •Sludger method
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Urban Infrastructure and Network Study notes for M. plan Sem-III
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