Statistics – Methodology
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..123p&link_type=abstract
Advances in Space Research, Volume 13, Issue 11, p. 123-127.
Statistics
Methodology
3
Scientific paper
Geographical Information System (GIS) is an efficient tool for collecting, storing, retrieving transforming and displaying spatial data and also non-spatial data from the real world for a particular set of purposes. Using GIS approach an attempt has been made to select suitable sites for checkdams for harvesting rain water. In this present study Alur taluk of Hassan district, Karnataka, India covering 400 sq. km. area was choosen. This area receives good rainfall annually, but due to the hilly terrain runoff is high. In spite of the natural gift of good rainfall, the people in this area are able to grow mainly rainfed crop as there are few irrigation facilities. Hence surface water harvesting was given priority and a suitable methodology has been developed for selecting sites for constructing checkdams. Various thematic maps of the study area on 1:50,000 scale were input and analysed using ARC/INFO GIS package. Second and third order streams were selected and superimposed over lineament (fracture) map to avoid such segments of streams which are controlled by fractures to avoid weak zone/seepages. Suitable sites were selected depending on contour and slope. Probable Waterspread Area (WSA) and Immediate Downstream Area (IDA) were drawn. These polygons were intersected with different thematic maps to find out the suitability. Before intersecting, appropriate weightages (least suitable to most suitable in the scale of 1 to 5) were assigned to different classes of thematic maps keeping in mind that worst area only gets submerged in case of WSA while in the case of the IDA, weightages were assigned keeping in view of the requirement of water. Normalized Cummulative Weighted Index (NCWI) was developed to find out the suitability of the sites from the view point of natural resources. All the seven sites selected were found quite reasonable based on the NCWI values. The villages which will get benefitted were identified. Field check has been carried out and it is observed that the sites are quite suitable.
Chandrasekhar M. G.
Ganesha Raj K.
Padmavathy A. S.
Thangavel P.
Yogarajan N.
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