Paper presented at 2nd IAHR Young Professionals Congress Abstract: The use of visualization techniques for obtaining elevation maps with simple and relatively low-cost procedures, apart from conventional topographic methods, is widespread. In the field of urban drainage systems, numerical models require greater grid detail to solve complex hydraulic problems. This study presents the use of Structure from Motion (SfM) and Light Detection And Ranging (LiDAR) techniques to obtain the roof and pavement elevations of an urban drainage experimental module. The digital reconstructions obtained are both satisfactory, in terms of the detail of the elements, and similar between each other, with a mean vertical error for both surfaces less than 2 mm. The main discrepancies between both procedures lie in collecting and processing point clouds and meshes.

The work developed by Manuel Regueiro-Picallo is funded within the postdoctoral fellowship programme from the Xunta de Galicia (Consellería de Cultura, Educación e Universidade). The contract of Esteban Sañudo is funded by the INTERREG ATLANTIC AREA program through the project AA-FLOODS (EAPA_45/2018). This work received financial support from the Spanish Ministry of Science and Innovation (MCIN/AEI/10.13039/501100011033) within the project “SATURNO: Early warning against pluvial flooding in urban areas” (PID2020-118368RB-I00).