Morphometric analysis of song watershed: A gis approach

The present study conducted in Dehradun district of Uttarakhand state advocates that remotely sensed data and GIS based approach in evaluation of drainage morphometric parameter was more appropriate than the conventional methods. Various linear, aerial and relief aspects were taken into consideration to analyze the morphometry of the study area and digital elevation model (DEM) and slope map of the catchment area were generated from ASTER data of 30 m resolution. The drainage patterns were mainly dendritic to sub dendritic. The slope of the study area had been divided into five equal intervals viz. gentle (0° to 13°), moderate (14° to 26°), moderately steep (27° to 39°), steep (40° to 52°), and very steep (53° to 65°). The order of stream of the study area ranged from 1^st order to 6^th order. The variation in stream length ratio might be due to difference in slope and topographic conditions. The variation of bifurcation ratio in the catchment area was ascribed to the difference in topography and geometric development. The drainage density was 2.03 km² which was moderate. The drainage texture was 8.75 which shows that the lithology is not so complex.