Dear Vijayakumar,

Good, Geologically that area is underlined by fresh-water fluviatile sediments
of lower gondwana sequence group of rocks. Tirupati sandstone itself is a good
aquifer.

1. the groundwater level rose by about 18 metres from September to Novemeber
(post monsoon seson) in two increments seperated by a week. This has not been
experienced since 2002.
2. The ground level is about + 45 m and The water level rose from -13 m to + 5
m above mean sea level.

2. The previous year's high was about 8 m below the present high. Both highs
occur with in a week after end of rainfall event.
3.Previously, when ever a gap of one week in rainfall is there, there was
recession in levels, where as now the recession limb is not falling like that
and daily pumping fluctuations in water levels were not so visible as they were
earlier. This seasons rainfall is about 50% more than that of last year, which
recorded normal rainfall.



Fom the given information, i wish to inform you that you see the local dip of
the formation, joint pattern in the excavated canal and slope of the terrain
towards the well location from the canal. You observe the rainfall vs water
level records of before the excavation of canal, see the withdrawl rate in the
local area and analyse the issue acccordingly.

For all of your above queries, If the water flown in the canal, that might
have given recharge in the area during 2002, but might not have been in previous
year. you observe the record of water levels and rainfall and water flown in
cananl.


best of luck

yours

Dr. Y.

S V Vijayakumar <vkumarsv@...> wrote:
Sir,

Thanks for your mail and seeking further clarifications on the study area. The
area of interest is the uplands of east Godavri district along NH5 in the out
crop area of Tirupathi sand stone formation, where the aqifer depth go up to 300
m. The canal is about 18m bedwidth and 3 to 4 m deep and mostly incutting and
goes with in a 1 km and cuts across the formation over a length of more than 12
km. Hope this info has given you picture of the situation.

I request you give your comments and and reports of similar observations
elsewhere. Can you please elaborate on the hydrgeology of such formations?

SIncerely,
Vijayakumar


S.V.Vijaya Kumar
Scientist E1, National Institute of Hydrology,
Deltaic Regional Centre, Siddartha Nagar, Kakinada 533003
Andhra Pradesh, India

Tel: (0884) 2372254(work); 2359570(home); 2350054(Fax)

Email: vkumarsv@... vkumarsv@...


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DR. Y. SRINIVASA RAO
DEPARTMENT OF GEOLOGY
SRI VENKATESWARA UNIVERSITY
TIRUPATI - 517 502
ANDHRA PRADESH
INDIA

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