Aure Flo Oraya, Ricardo Fornis, Roland Otadoy
A catchment area represents a region which drains its surface water to a common outlet. In a natural catchment, where the path of the water follows the steepest slope of the natural terrain, the delineation of this region can be done by using LIDAR Digital Elevation Model (DEM). In developed areas where drainage systems are put in place, the draining of the water is altered by the elements of these systems and since these elements are usually placed under the ground surface the LIDAR DEM cannot capture the information needed to describe the influence of these elements in the draining process. As a consequence using the LIDAR DEM alone in delineating catchment area in regions undergoing development may not provide reliable result. In this study, catchment area of the University of San Carlos-Talamban Campus (USCTC) was delineated using HEC-GeoHMS 10.2 in ArcGIS 10.2. The delineation makes use of a LiDAR DEM with a 1 meter resolution. The location and elevation of different elements of the drainage system in the campus were gathered in the field and the data were incorporated in the DEM using the trend interpolation tool in ARCGIS 10.2. The result was a LIDAR DEM with channels to represent the drainage system. Simulation results of HEC-GeoHMS have shown that channelized LIDAR DEM yielded better representation of the actual flow of water than the unedited LIDAR DEM.
USC Phil LiDAR Research Center, University of San Carlos Nasipit, Talamban, Cebu City, 6000, Philippines; Department of Civil Engineering, School of Engineering, University of San Carlos Nasipit, Talamban, Cebu City, 6000, Philippines; Theoretical and Computational Sciences and Engineering Group, Department of Physics, School of Arts and Sciences, University of San Carlos Nasipit, Talamban, Cebu City, 6000, Philippines
