strategy to characterise ground water resources for
identification of well locations in Ghana using GIS as the
unifying element. For the assessment of groundwater
resources of Northwest Florida water management
district, Richards et.al. (1996) took the advantage of GIS
for spatial analysis and data visualisation.
Krishnamurthy et.al. (1996) developed a GIS based
model for delineating ground water potential zones of
Marvdaiyar basin Tamilnadu, India by integrating
different thematic layers derived from remote sensing
data. The field verification of this model established the
efficacy of GIS in demarcating the potential groundwater
reserves. Application of GIS for groundwater resource
assessment has also been reported by Sander (1997),
Teeuw (1999) and others.
The present work envisages to assess the groundwater
resources of the following villages Kohir, Pichagarah,
Hoti, Digwal, Raipalli, Pistapur, Algole, Didgi, Kothur,
Bardipur, Malkapur, Regintal, Hadnur in and around
Zaheerabad town covering approximately 150 sq.km's.
An integrated approach of Remote Sensing, GIS and
Electrical Resistivity for groundwater potential mapping
has been followed. The study has helped to identify the
problems and potential of the area to generate a water
resource database for overall development on a
sustainable basis. In this regard the micro watershed
scheme has been followed wherein harvesting of water
resource judiciously in a smaller hydrological unit has
the prime importance. Thus the right mix of technology
and traditional wisdom would be a winning combination,
a plan that integrate- mega projects with micro efforts
like rain harvesting and watershed management A
parched India will take the shine off a resurgent India.
DESCRIPTION OF THE STUDY AREA: Situated at
a distance of 100 kms from Hyderabad, the capital of
Andhra Pradesh the study area in Medak district lies
between 17°35” and 17°50” of north latitudes and 77°30”
IRS- IC LISS III DATA OF THE STUDY AREA
and 77°40" of east longitude (fig) falling in survey of
India toposheet no.56G/9 & G/10. The area comprises
787
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B2. Istanbul 2004
of several villages and the major town is Zaheerabad.
which is on Hyderabad-Mumbai national highway
no.9.
The area is marked with plateau, valley, scrap. forest
and ephemeral streams within an altitudinal range of
610-660 metres above msl. Normal average rainfall is
estimated to be 926 mm. The past ten year average
show that the rainfall has been below the average.
The area is hot for most part of the year. During
summer the maximum temperature is around 42°C
(107.6°F) and the minimum temperature is around
26°C(78.8°F). May is the hottest month. During
winter the maximum temperature is around
29°C(84.20°F) and the minimum temperature is
around 14?C(57.2?F). December is the coldest month.
It experiences mostly tropical climate. The river
Manjera and its tributaries mainly drain the area.
GEOLOGY MAP
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> BASALTS
LA TERITES
GEOLOGY, GEOMORPHOLOG Y &
GROUNDWATER CONDITIONS OF THE
STUDY AREA: It is well established that geology
plays a vital role in the distribution and occurrence of
groundwater, Krihnamurthy and Srinivas (1995). In
the present study geological mapping is done using
IRS-1C, LISS-HI image, (Fig 1.) using image
processing software ERDAS for better exposition of
hydro-geólogical features. GIS package ARC-INFO
is used for the mapping of the features. Basalts are
showing bluish tone with coarse texture and the
laterites show greenish tone. The geological map is
shown in (fig.] ). Basalts occurring in and around
Zaheerabad exhibit both vesicular and non-vesicular
forms. The non-vesicular massive units fine
grained, dense and compact, they are dark in colour.
In some places they show columnar and spheroidal
structures and commonly show well-developed joints
in various directions. The vesicular type of basalts is
highly altered which gave rise to laterites. In the study
are
