Influence of the resolution of digital terrain models in flood layer water height calculations

This paper examines the effect of using different Digital Terrain Models (DTMs) for different return periods and different configurations of cross-sections in the simulation of flooding. The hydraulic behavior is simulated for a one-dimensional model of part of the Henares river located in Madrid, Spain, with two maximum flood return periods (5 and 100 years), using two sets of cross sections (50 and 100 meters apart). The influence of three DTMs-raw LiDAR, edited LiDAR, and DTM from photogrammetry-was studied with respect to the final height of the water layer for these different floods. The edited LiDAR gave the best results, and it is proposed for use in a pseudo DTM.