Dynamic flood webmapping: an operational and cost-limited tool to optimize crisis management

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(1)E3S Web of Conferences 7, 09003 (2016) FLOODrisk 2016 - 3rd European Conference on Flood Risk Management. DOI: 10.1051/ e3sconf/2016 0709003. Dynamic flood webmapping: an operational and cost-limited tool to optimize crisis management 1,a. 1. 2. 1. Quentin Strappazzon , Arnaud Koch , Loïck Guesdon & Marc Delbec 1. Prolog Ingénierie 11, rue Auguste Lacroix, 69003 Lyon, France SyAGE (Syndicat mixte pour l'Assainissement et la Gestion des Eaux du bassin versant de l'Yerres) 17, Rue Gustave Eiffel, 91230 Montgeron, France 2. Abstract. Due to strong climate variations and the multiplication of flood events, protection based strategies are no longer sufficient to handle a watershed scale crisis. Monitoring, prediction and alert procedures are required to ensure effective crisis and post-crisis management which explains the recent interest for real time predictions systems. Nevertheless, this kind of system, when fully implemented with in-situ monitoring network, meteorological forecast inputs, hydrological and hydraulic modelling and flood mapping, are often postponed or cancelled because of both their cost and time scale. That is why Prolog Ingénierie and the SyAGE have developed, as an economical and technical sustainable alternative, a tool providing shared access to a real time mapping of current and predicted flooded areas along with a dynamic listing of exposed stakes (such as public buildings, sensible infrastructures, environmental buildings, roads). The update of these maps is performed from the combination of predicted water levels in the river and a flood envelop library (based on 1D/2D hydraulic model results for a wide panel of discharges and hydraulic structures states conditions). This tool has already been implemented on the downstream part of the Yerres River, a tributary of the Seine River in France.. 1 Introduction: from meteorological forecasting to flood forecasting In a context of climate change and increasing frequency and magnitude of extreme weather events, constantly revealing the limits of individual and collective protection, and calling into question the design bases, monitoring, forecasting, alert and crisis management are the heart of public action that must be implemented to: assure the people security, reduce the direct and indirect consequences due to flood events and allow a return to normal as quickly as possible. In such situations, the crisis unit(s), being either internal to local community or extended at departmental or regional level, constitute the decision making nerve about actions to engage and human and material resources to be mobilized on the ground. In this crisis management plan, the access and sharing of cartographic information in real time about both observed and predictable flooded areas and potentially impacted stakes, is a considerable advantage. It allows to identify the areas and sectors which will have to be rescued or evacuated, and to count their inhabitants, roads that will be cut, the future isolated areas, to locate schools or health facilities to evacuate or on the contrary which may be used to host the victims, to determine the areas at risk of energy stress or communications blackout, etc. a. Thus, this mapping information is a valuable tool for crisis management, and should be easily disseminated to all risk stakeholders: emergency services, municipalities (implementation of safety communal plans - PCS), public institutions managers, actors public and private, local residents, etc. France has invested and mobilized substantial resources in terms of flood forecasting. Météo-France, SCHAPI (Hydrometeorological and Flood Forecasting Central Service), SPC (Flood Forecasting Service), ensure the monitoring and forecasting of rainfall and floods and the diffusion of warning to those involved in crisis management and the public [1]. This forecast information is often consigned in a newsletter, dealing with overall developments and point estimates (for monitoring network stations) regarding flow rates and water levels. Maps delimiting the extent of potentially submerged areas are usually not provided. Paper maps available in crisis units were often produced in Floo

(2) tlas (AZI), Flood Risk Prevention Scheme (PPRi), Flood Risk Territories maps (TRI), or specific local studies. The flood events mapped do not always correspond to the event that is currently taking place, the paper format prevents an easy dissemination and sharing of the same information, the stakes are not always represented.. Corresponding author: strappazzon@prolog-ingenierie.fr. © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/)..

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