MORPHOMETRIC ANALYSIS FOR PRIORITIZATION OF SUB-WATERSHED ON THE SERAYU BOGOWONTO RIVER BASIN

Determining watershed priorities is one of the critical aspects of developing natural resources around us. Morphometry is one of the natural parameters that form the characteristics of a river catchment area and could be used for determining it. Morphometry has three parameters such as linear aspect, relief aspect, and areal aspect. The linear aspects consist of stream order (U), stream length (Lu), bifurcation ratio (Rb), mean stream length (Lsm), stream length ratio (Rl), mean bifurcation ratio (Rbm). Relief aspect consists of basin relief (Bh), relief ratio (Rh), ruggedness number (Rn). Areal aspects comprise drainage density (Dd), stream frequency (Fs), texture ratio (T), form factor (Rf), circularity ratio (Rc), elongation ratio (Re), length of overland flow (Lg), constant channel maintenance (C The purpose of this research is to analyze morphometry parameters of Serayu Bogowonto river basin of the sub-watershed priority determining. This study aims to calculate and analyze characteristics of the sub-watershed of Serayu Bogowonto river basin based on morphometry parameters using GIS and analysis for the watershed priority. The data utilized in this study is the river network data published by Bakosurtanal, and Digital Elevation Model (DEM) 30x30 ASTER GDEM then data analysis is using Geographic Information System (GIS) technique with ARC GIS 10.1 The prioritization based on morphometry analysis that is seven sub-watershed with high priority, four sub-watershed with medium priority, six sub-watershed with low priority