• SUHAS RAJU A
• Shivakumar J Nyamathi

The difference in areal and relief factors that impact on assessment of hydrological characteristics during the watershed management studies, flood studies, irrigation and other sensitive analysis. To identify and quantify those difference in Morphometric parameters and to determine the most suitable freely available DEM’s among ASTER(30m), Cartosat-1(30m), JAXA(30m), SRTM(30m), TanDEM-X(90m) with respect to Toposheets(1:50,000 scale) on the point of reference data for Morphometric study of two sub-watersheds, Study area 1: Kumudavati Sub-watershed (C09PEU03) situated in Chickballapur district, Karnataka state, lies geographically at longitude (77⁰23’00”E - 77⁰30’00”E) : (77⁰23’00”E - 77⁰30’00”E) and (10⁰12’00”N - 10⁰11’00”N) : (10⁰22’00”N - 10⁰22’00”N) latitude, It covers an area of 431.08Sq.km with varying elevation from 648m-1160m under Pennar Upper Sub-Basin. Study area 2: Amaravati sub-watershed (C05CAM73) situated in Dindigul district, Tamilnadu state lies geographically at longitude (77⁰20’00”E - 77⁰32’30”E) : (77⁰20’00”E - 77⁰32’30”E) and (13⁰22’00”N - 13⁰22’30”N) : (13⁰40’00”N - 13⁰40’00”N) latitude, It covers an area of 146.67Sq.km with varying elevation from 369m-2400m under Cauvery Middle Sub-Basin. Morphometric analysis using GIS techniques,to quantify and compare the drainage systems for sub-watersheds,Morphometric characterization of both sub-watersheds are as follows, Kumudavati is variable of sixth ordered and Amaravati is variable of fifth ordered with drainage networks of Kumudavati as dendritic with moderate to coarse drainage texture, While Amaravati as dendritic with fine to coarse drainage texture, and Stream frequency of Kumudavati is low, while Amaravati is moderate. The values of form factor and circulatory ratio suggest that both Sub-watersheds are elongated. Higher bifurcation ratios of 6th order streams of Kumudavati and 4th order streams of Amaravati suggest that headward erosion is stronger. While, the Hypsometric properties of, both Sub-watershed using hypsometric integral (HI) values where Kumudavati Sub-watershed was found to be 0.23, 0.22, 0.20, 0.20, 0.20, and 0.19 watershed falls under the Monadock(old) stage, while Amaravati Sub-watershed was found to be 0.62, 0.62, 0.63, 0.62, 0.63, and 0.63 watershed falls under the Young stage with ASTER, JAXA and SRTM DEM’s suits best with their use as they are very close to contour Area at each contour interval of Toposheet values than that of Cartosat-1 and TanDEM-X DEMs.

DEM Data and Toposheets, Morphometric parameters, Hypsometric Integrals and GIS techniques.

"Comparative Morphometric Study of Sub-Watersheds Using Toposheet And Various Dem Data Sets", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.10, Issue 8, page no.g496-g516, August-2023, Available :http://www.jetir.org/papers/JETIR2308654.pdf

"Comparative Morphometric Study of Sub-Watersheds Using Toposheet And Various Dem Data Sets", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.10, Issue 8, page no. ppg496-g516, August-2023, Available at : http://www.jetir.org/papers/JETIR2308654.pdf