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IAPRS & SIS, Vol.34, Part 7, “Resource and Environmental Monitoring”, Hyderabad, India, 2002 
  
percolation tank. A 200 meters buffer zone was created 
around streams of order <3 rd order and area falling under 
this buffer zone was extracted from composite site 
suitability layer. Similarly, streams of order > 3 rd order or 
less were selected for identifying suitable sites for check 
dams. 
> Alternatives in the best suitable sites: Even in the first best 
suitable zone alternative sites, which were identified further 
ranked based on criteria like Suitability ranking, 
availability of good terrain conditions for impounding of 
water along the stream i.e. at least up to 200M upstream 
from the structure and in the surrounding area, confluence 
of channels etc., similarly, second best suitable zone & 3rd 
best suitable zones were also analyzes and exact location 
for constructing water harvesting structures were identified. 
> Conditions fulfilling suitable sites: Watershed area was for 
each of the proposed sites and certain sites which failed to 
satisfy the watershed norms were eliminated. Minimum 
catchment area requirement for percolation tank was taken 
as 40 hectares. For check dam the minimum catchment 
area requirement would be 25 hectares. 
» Distance norms: I) On the same stream no two check-dams 
should occur within a distance of 2 Km. On the same 
stream no two percolation tanks occur within a distance of 
5 Km.II) Distance between 2 check-dams occurring on 
different streams should be greater than 1 Km distance and 
distance between two percolation tanks would be more 
than 2 kms. III) Distance between an existing water body 
and proposed check dam should be »1 Km. IV) Distance 
between an existing water body and proposed percolation 
tank should be » 2km. 
4.4.6 Conclusions: 
Locating the favorable sites for construction of water harvesting 
structures by an expert is tedious and time-consuming task. 
Further, the results will vary from expert to expert and hence 
there need to develop a Decision support systems which can 
provide unambiguous results for such problems. The Decision 
Space software developed by ADRIN can very effectively be 
used in locating suitable water harvesting structures elsewhere 
as long as the conditions fulfill the Decision Space 
requirements. It can be used to model other Natural disasters 
like floods, landslides etc., 
5 CONCLUSIONS 
It can be concluded from the above case studies that temporal 
satellite imagery data together the Decision support system 
(like Decision Space developed by ADRIN) can play an 
important role in the Monitoring environmental hazards like 
Landslides, floods etc, as well as in locating natural resources 
like suitable sites for construction of artificial water harvesting 
structures such as check dams and percolation tanks. 
6 ACKNOWLEDGEMENTS 
The authors are grateful to Dr.R.Krishnan, Director ADRIN for 
encouragement and allow us present the same at ISPRS ITC VIII 
Symposium held at Hyderabad during December 3-6, 2002. 
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