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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B4. Beijing 2008 
sandstones were assigned moderate weightage on account of 
their water holding capacity. Alluvium was assigned highest 
weightage due to higher porosity and permeability. 
Likewise for hydro-geomorphic units, ridge type structural hills 
were assigned low values, cuesta type structural hills, piedmont 
zone and alluvial fan moderate values and the highest weightage 
was assigned to the old and young river terraces. Piedmont 
zones into moderate ground water potential zone. The ridge type 
structural hills with low lineament density and higher drainage 
density were assigned low values. 
The slope % >10 was assigned least weightage on account of 
steeper slope and higher run off. 5-10% and 3-5 % slope was 
assigned moderate weightage due to moderate rate of infiltration 
and discharge, 1-3 %and <1 % slope area was assigned the 
highest weightage. Drainage density value <1.84 are assigned 
the highest weightage on account of lower number of drainages 
per unit area, followed by 1.84-2.39, range between 2.39-3.12 
and 3.12-3.44 were assigned lower values >3.44 was assigned 
the lowest weightage. Similarity owing to secondary porosity 
lineament density values <0.4 was assigned the least weightage, 
0.4 - 1.35 moderate and >2.52 the highest. 
Land cover also influence the ground water infiltration and 
alters the rate of percolation of precipitation on the hill slope. 
Agriculture classes were weighted the highest. Thick forest 
vegetation cover was assigned higher weightages, degraded 
forest and land with scrubland classes were weighed moderately 
and the stony rocky waste area with least weightages. 
All the weighted thematic maps were integrated and on the basis 
of the users defined criteria using the Arc-info software and 
potential ground water prospect zones were identified in the 
GIS environment one of the query based analysis is 
demonstrated in (Figure-5). 
FIG.7.17 
GROUND WATER POTENTIAL REGION IN HILLS 
(HIGHER YIELD POTENTIAL) BASED ON GIS QUERY 
NAHAN-SATAUN-PAONTA AREA. H.P. 
Thus in the absence of any scientific approach, the above 
mentioned hydro-geological study which encompasses the 
modem techniques of remote sensing and GIS together with 
geological data certainly assisted in accurately modeling the 
ground water flow system at the local level. With the use of this 
simple hybrid technique of remote sensing satellite data, 
interpretation for thematic layers and the use of GIS for the 
ultimate data integration based on the user defined criteria with 
weighted approach, it is possible to identify the potential sites 
for bore wells both in the hilly terrain and in the intermountain 
depressions in the hills. 
ACKNOWLEDGEMENTS 
The author expresses his deep sense of gratitude to his research 
supervisors Prof. Ravindra Kumar, Director and Chairman, 
Centre of Advanced Study in Geology, Panjab University, 
Chandigarh, India and Dr. Ravinder Kumar Sood, Joint 
Member Secretary and Chief Executive Officer, State Council 
for Science Technology & Environment, Shimla, India for his 
guidance in the field of Remote Sensing and ground water 
exploration both in lab and field has made it possible to put 
forward the present research paper. 
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