Extraction of Surface Imperviousness from Land Use Land Cover Analysis for Part of Hyderabad City

Abstract

Surface imperviousness is vital basin parameter and plays a major role in watershed hydrology especially in an urban environment. Estimation of surface imperviousness is crucial but tedious task in urban watershed modelling as urban land use changes very frequently. The challenge encountered in calculating surface imperviousness is the need for a simple and effective approach to the characterize impervious surfaces in the watershed without much error. Detailed land use land cover maps form a great source of information for hydrologic analysis. Recent advancements in technology have brought us the benefits of aerial photography and access to high-resolution satellite imagery. The present study highlights a methodology to extract surface imperviousness of an area by processing high-resolution satellite imagery and developing land use land cover map. Densely urbanized of part of Hyderabad city (Zone-XIII) being one of the critical flood-prone zone is picked in this study to extract surface roughness from land use land cover map. LISS-III and ETM+ satellite imagery is used to develop land use land cover maps of study. The result shows the rise in overall surface imperviousness of Zone-XIII by 20% from the period of 2001 to 2016.