Abstract:
The frequency of the occurrence of disasters is increasing day by day. Urban
flooding has become one of severe problems faced by Sri Lanka seasonally leading for
various social and environmental interruptions. With the increasing of the occurrence it
has become a necessity to find a proper solution to
mainly focuses to optimize the drainage network in Panadura urban council area, Sri
Lanka to minimize the urban flood hazard susceptibility using Remote Sensing (RS) and
Geographical Information System (GIS) techniques.
Light Detection And Ranging (LiDAR) Digital Elevation Model (DEM) was utilized to
delineate requisite drainage and mini water catchments using Environmental Systems
Research Institute (ESRI) Arc Hydro Model. Prior to LiDAR DEM processing an accuracy
assessment was performed with respect to the ground truth elevation measured by Total
Station and GPS surveys. Current available drainage system in the area was assessed in
two ways as alignment and capacity for large water volumes in heavy rainfalls with
respect to the delineated natural drainage system. By performing the comparison
successfully, highly flood vulnerable locations in the current drainage system were
identified. Finally adjustments to the current drainage network and new drainage paths
were proposed.
Citation:
Nadeeka, P.M., Kumari, M.A.D.N., Abeysinghe, A.M.K.B., Chaminda, S.P., & Premasiri, H.M.R. (2011). Optimization of drainage network to minimize urban floods using remote sensing and GIS techniques. In N. P. Ratnayake & A.M.K.B. Abeysinghe (Eds.), Proceedings of the 6th National Conference on Minerals and Innovative Thinking (pp. 25-28). Department of Earth Resources Engineering, University of Moratuwa