  High resolution (infra-metric) topographic data, including photogram-metric
born 3D classified data, are becoming commonly available at large range of
spatial extend, such as municipality or industrial site scale. This category of
dataset is promising for high resolution (HR) Digital Surface Model (DSM)
generation, allowing inclusion of fine above-ground structures which might
influence overland flow hydrodynamic in urban environment. Nonetheless several
categories of technical and numerical challenges arise from this type of data
use with standard 2D Shallow Water Equations (SWE) based numerical codes.
FullSWOF (Full Shallow Water equations for Overland Flow) is a code based on 2D
SWE under conservative form. This code relies on a well-balanced finite volume
method over a regular grid using numerical method based on hydrostatic
reconstruction scheme. When compared to existing industrial codes used for
urban flooding simulations, numerical approach implemented in FullSWOF allows
to handle properly flow regime changes, preservation of water depth positivity
at wet/dry cells transitions and steady state preservation. FullSWOF has
already been tested on analytical solution library (SWASHES) and has been used
to simulate runoff and dam-breaks. FullSWOFs above mentioned properties are of
good interest for urban overland flow. Objectives of this study are (i) to
assess the feasibility and added values of using HR 3D classified topographic
data to model river overland flow and (ii) to take advantage of FullSWOF code
properties for overland flow simulation in urban environment.
