Abstract

Catchment & overland flow pathway description using liDAR
Track: Water Resources
Authors: Sultana Baby

This paper presents specific examples comparing catchment &overland flow pathway description using GIS grid based techniques and the traditional (manual) approach in urban sewer and storm water catchments. With increasing availability of detailed ground topography and LiDAR datasets accurate digital elevation models (DEM) of urban areas can be produced using GIS raster techniques. Features like roads, buildings and stream banks have great effect on catchment dynamics and overland pathways and as such must be accounted for in the model set-up. This is possible by means of high resolution DEM's that relate to the catchments topography. Catchment and overland pathway delineation is an essential and important step for both storm water and sewer system modelling studies. Topography and network features, influence urban catchment delineations and flow path generation. Manual catchment & flow paths delineation is very time consuming. This paper presents two different methods of automated catchment and flow path generation.