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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004
1.2 Force of Action
The selection of suitable alternatives site for the rehabilitation
of uprooted native people forms the basis of present study.
2. ENVIRONMENTAL IMOPACTS ENVISAGED
The study area whose geographical extents are shown in figure
] lies around 30°45’N and 78°S0’E consisting of an area of
about 2500 Km in the inner belt of Central Himalayan Region.
Social and environmental impacts of this large dam have been a
cause of concern over the last one decade as the dam is in the
proximity of an active Srinagar Thrust (Prasad and Rawat,
1986). The evidence suggested that the elites living far from the
dam site will enjoy the benefits of the irrigation and power, it is
the indigenous people who with low social status and little
potential power will suffer the negative effects of dam. In
addition to the anticipated increase in the incidence of water-
borne disease such as the debilitating schistosomiasis
(nilharzias), malaria and onchocerciasis (river blindness). Other
potential costs which can be triggered by the construction of
this dam in the geologically sensitive area are the economic
costs of submergence of valuable resources such as fertile land,
lumber and medicinal plants and the loss of hardwoods and
biological resources. Therefore, while selecting the alternative
site nearby for the displaced people, the scientific knowledge of
the soil, its stability and the ecological balance of the selected
site will permit the appropriate eco-friendly use of the land.
3. INVESTIGATION PROCEDURE
The published topographic cultural / physiographic map by the
Survey of India at 1 : 50000 scale is used to prepare the base
map and the land set TM data obtained from IRS LISS II of
November 11, 1993 is being used as remote sensing output.
The geological map of the area is digitized at original mapping
scale of 1 : 50,000 and the areas if misties have been solved
using remote sensing data. The maps have been generated in
Polyconic projection system having Everest Ellipsoid for
30°45°N Latitude and 78°50’E Longitude.
Such special data maps in the form of topography, hydrology,
geology, soil types, forest/land cover stored as layers in digital
form in the computer. And finally, the presentation of results
based on the outcome of comparing/overlaying the spatial data
with different sets of features, their distribution in space and
actual field checks.
4. RESULTS AND DISCUSSIONS
The Indian Space Program has been developed with multi facet
vision for using space technology and the agriculture being the
foremost. The Indian Remote Sensing Satellite (IRS) picture
LISS-II offers the valuable dissemination of information on
improved land, soil, water, vegetation utilization capabilities.
The field checks show the variation of slopes from 100-300
m/km having southern aspect. The soil is of alluvial type
containing soil moisture of about «20 to 4076 on an average.
The soil is of clayey to sandy loam type having moderate
quantity of organic matter.
On the basis of false color composite (FCC), figure 2 has been
generated from the digitized data of Derhadun and is
surroundings covering an area of about 2500 Km between the
two major river the Yamuna in the west and the Ganga in the
east, in order to demarcate various themes distinguishable from
different colors. The red color covering and area of about 1500
543
Km? shows the forest envelope at higher altitudes (more than
2300m above sea level marked with A and B) which is vital for
man, plant and animals, fulfilling the basic needs of fuel
fodder, manure, medicines and raw materials for industries.
The plant area (marked with X,Y and Z), the yellow color
depicts the agricultural area of about 700 Km? where the soil is
very fertile having the moderate organic content. The green and
orange color together shows the plantation of various kind
covering an area of about 350 Km?. The Urban area is very less
and the area covered by the water is about 20 Km” shown in
blue color.
Towords Tehri Dom
7,
River Gongo
Fig. 2 Land Cover Themes — IRS LISS-II November 1993
5. CONCLUSION
Therefore, based on the latest available remote sensing
information on water and land resources, integrated with the
GIS provides an insight for planning the rehabilitation of about
50,000 uprooted people from Upstream which is about 60 Km
North-East of Dehradun city, can be thought of, without
endangering the existing environment.
6. ACKNOWLEDGEMENTS
The author is grateful to various local agencies who have
helped him during field checks. Several useful discussions were
held with the Staff of Garhwal Vikas Mandal, Derhadun during
the preparation of this paper. The help rendered by the staff is
thankfully acknowledged.
7. REFERENCES
Pearce, F (1996) Superdams - have their attractions been
overshadowed? Journal of Geosciences and development No.
3, pp 7-10
Prasad, C. and Rawat, G.S. (1986) Studies in recent
reactivation along the Srinagar Thrust. Garhwal Himalaya
Proc. Inter. Symp. Neotectonics in South Asia, Survey of India,
Dehradun pp 301-312.
Saxena, P.B., Bishnoi, Antium, Bhatia, D.K. and Saxena
Bhuwan (1998) Investigations of eco-restorations of the
Asarori - Mussoorie water divided to twin water sheds (Suswa-
Asan) in the Derhadun Jr. Himal. Inst. of Action Research &
Development, pp 19-29.
Tiwari, R.S. and Garg, P.K. (1995) Land form and Land uses of
Doon Valley and their role in resource development. Jr.
Himalayan Geology, Vil. 6(2), pp 9-15.
Valdiya, K.S. (1997) High Dams in Central Himalaya in
context of active faults seismicity and societal problems. Jr.
Geol. Soc. of India, vol. 49, pp 479-497.
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