PRIORITIZATION OF SUB-BASINS IN JAISAMAND CATCHMENT USING REMOTE SENSING AND GEOGRAPHICAL INFORMATION SYSTEM

The drainage characteristics of the Jaisamand catchment have been studied using Survey of India’s topographic sheets of 1: 50,000 scales. The drainage pattern for delineated Jaisamand catchment was exported to ARC/GIS-10 software for morphometric analysis. The parameters computed in the present study includes stream order, stream length, stream frequency, bifurcation ratio, drainage density, stream frequency, form factor, circulatory ratio, elongation ratio, relief ratio and ruggedness number by standard methods and formulae. Then prioritization of different sub basins according to the order in which they have to be taken for treatment and soil conservation measures carried out. The total length of stream segments is maximum in first order streams and decreases as the stream order increases. The total stream length in the Jaisamand catchment is 7351.83 km. The values of the stream length ratio vary from 2.31 to 6.29 for the whole Jaisamand catchment. The relief of the catchment is 413 m and it varies from 83 m to 413 m in the sub-basins of the study area. The drainage density in the whole basin and sub-basins of the study area shows variation from 2.33 to11.50 km per km2 suggesting high drainage density.