Agricultural Engineering Today Morphometric Analysis of Morna River Catchment using Geographic Information System A. P. Bowlekar (LM-11577) 1*, H. B. Sawant2, S. B. Nandgude3 and D. M. Mahale4 1,2B. Tech. Scholar, 3Professor (CAS), 4Professor and Head Department of Soil and Water Conservation Engineering, College of Agricultural Engineering and Technology, Dr. Balasaheb Sawant Konkan Krishi Vidyapeeth, Dapoli – 415 712, Dist: Ratnagiri (MH), India *Corresponding author email address:
[email protected] Date of submission: 11.10.2018 Date of acceptance: 14.12.2018 ABSTRACT In this study, GIS and a high-resolution Digital Elevation Model (DEM) have been utilized for estimation of morphological parameters of Morna river catchment. This was developed using the Visual Basic for Application (VBA) language based on the Arc objects technology developed by the Environmental System Research Institute (ESRI). Several morphometric parameters have been computed and analyzed viz.; linear aspects such as stream order, stream number, stream length, mean stream length, stream length ratio; areal aspects such as drainage density, stream frequency, drainage texture, elongation ratio, circularity ratio, form factor, constant of channel maintenance; relief aspects such as relief, relief ratio, relative relief, ruggedness number and length of overland flow. Impacts of morphometric parameters on flash flood characteristics have been also investigated. The presence of the maximum number of the first order segments shows that the basin is subjected to erosion and also that some areas of the basin are characterized by variations in lithology and topography. The form factor is 0.25 and circulatory ratio is 0.43 which suggests elongated type of catchment. Elongation ratio is 0.54 which indicates that watershed has high relief and steep slope.