if the aquifer is such that the artesian pressure exists between two
layers of rocks, then one of the lower or upper region of rock may not
be neceesariyly be driven with a casing pipe. instead, hole passing
through rock formation will function as a casing pipe. more or so, you
may try to get compressor results from the adjoining area or read
longitudinal or traverse section of geological formations, say
aquifer. central ground water board of k region would be in a better
position to get you some more light on the subject.

--- In rhydrology@yahoogroups.com, channa basavanna
<channabasavanna@...> wrote:
>
> Dear Ponni,
>
> I am also from Tumkur Region.
>
> What the geologist and the Rig man says is correct
> upto my knowledge, because I have seen more than 50
> borewells in the region, they have only taken max of
> 200 ft casing.
>
> So no problems in only 200ft casing and going upto
> 650-700ft depth.
>
> Regards,
>
> Channabasavanna.A
>
> Environmental Engineer,
> ENVIRONMENTAL INTERNATIONAL CONSULTANTS
> P.O. Box: 123401,Dubai- U.A.E.
> Tel: +971 4 3357044 Fax: +971 4 3357033
> Mobile: +971 508509819
> Website:www.eicon.ae
>