Tradition of danger: Cerema develops a web based flood vulnerability observatory for EPTB Vienna

As a part of a analysis and growth partnership, Cerema has developed a number of instruments for the general public regional watershed group (EPTB) Vienne and native actors, aiming to raised perceive the area’s vulnerability to flooding and dispersal.
The results of greater than a yr of labor, the net vulnerability observatory works to enhance danger consciousness.

This flood vulnerability observatory was formally submitted to the COPIL verification of SLGRI Vienne-Clain, held on Could 6, 2022, in Naintré (86).

Initially, the area’s request to have a neighborhood database of vulnerabilities

EPTB Vienne gives assist for a number of actions in addition to basic animation throughout the framework of the Flood Prevention Motion Program downstream of Vienne (11 municipalities). database on issues in flood zones.

To take this motion, EPTB Vienna contacted Cerema, who’s conducting nationwide analysis on the deployment and enchancment of the nationwide flood vulnerability reference system. [1]. This partnership is a analysis and growth settlement between two buildings. The 2 predominant objectives had been:

  • Create a database of vulnerability accessible through platform geographic info to be used “skilled”.
  • develop all public on-line observatory For higher dissemination of knowledge.

Administration is constructed round companions who will likely be future customers of the database. Thus, EPTB Vienne, Centre-Val de Loire Area (below the ERDF Plan Loire), Division of Vienna, CA have dedicated themselves. Grand Châtellerault, CC. Vienna and Gartempe, CU. Grand Poitiers, SCOT Seuil du Poitou, SCOT Sud Vienne, DDT Vienne and DREAL Nouvelle Aquitaine.

Map of the variety of employees in a flood zone

Cerema prolonged this preliminary examine on the power of its earlier expertise within the land of Grand Poitiers. calculation of vulnerability indicators downstream PAPI labored on the municipalities of Vienne and Creation of a GIS device accessible to companions.

Flood vulnerability indicators primarily based on 100 years of floods had been calculated utilizing the next methodology: Nationwide flood vulnerability comparability (In reference to the axes of the Nationwide Flood Danger Administration Technique: individuals’s security, price of harm and restoration time).

The primary specialist device for company companions

Initially, Cerema was a visualization device for the institutional companions of the examine. After a comparative examine of various information warehouse options, the selection fell on “free” software program, specifically: putting in a POSTGRESQL database hosted on a distant server and consulting it with QGIS.

So the consumer entry calculated indicators instantly (35 in complete) comparable to floodplain residents and the price of jobs or harm to properties. All these indicators are calculated and included within the municipality however the “skilled” consumer can even visualize exact information, which information within the transactions to be made. For this, every accomplice has entry to the database from a safe personalised account with a password.

The “skilled” consumer can even obtain the GIS information and import it into the database following a process. Lastly, QGIS tasks had been created for every indicator permitting “turnkey” entry.

The aim is to be one simple and frequent use by companions (from the world of dangers or GIS), Cerema has additionally included the tutorial dimension in its work. Subsequently, database entry, configuration in QGIS, visualization of metadata, import of knowledge, every utility observe web page step-by-step. Lastly, Cerema educated numerous companions on how one can use the device.

The aim of this homogeneous database on a regional scale is to be a related reference device for all gamers concerned within the flood danger prevention coverage.

Develop a tradition of flood danger among the many basic public by way of a web based observatory

Flood in Poitiers aerial view (10 m flood on river bank)
Credit score: Vienna DDT

The second a part of the partnership,basic public entry by visualizing indicators through a web based mapping device.

The Vienna–Clain Flood Vulnerability Observatory might be accessed on the following hyperlink:

Vienna ETPB Observatory

The positioning is meant to be ergonomic and user-friendly for easy navigation and tailored to most people. Additionally, it permits public determination makers systematic entry concise and quick info.

Along with a number of context and knowledge components associated to flood danger, the location is structured in response to the three axes of SNGRI described above. Indicators are collected right here within the municipality with quantitative outcomes, with out exact visualization of the related points.

For every vulnerability indicator, the next might be consulted: the outline of the indicator, a dynamic map (with a layer supervisor that, amongst different issues, permits viewing of 100 years of hazard), interactive graphics and Numerical information. If the consumer needs, he can obtain the dashboard and at last the printable map in pdf format, which is able to give him extra technical explanations, specifically about calculation strategies, enter information or factors of consideration.

Map of the number of people in single-storey buildings subject to severe flooding (+ 1.5 m of water)
Inhabitants map on flood susceptible floor flooring (+ 1.5 m water)

chart with data

Prospects for an improved and expanded observatory

The flood vulnerability observatory contributes to the event of risk-related data and consciousness. At present restricted to some cities surrounding Grand Poitiers and Vienne and included across the PAPI Vienne Aval and together with Châtellerault, this car is about to prosper particularly within the coming years. wider scope as a part of the Vienne-Clain PAPI at present below growth.

Furthermore, methodological analysis It is going to profit the area that an automatic nationwide car is pushed on the correct warehouse. So the aim is to evolve in the direction of a device that makes it attainable. restart the calculation of indicators routinely from more moderen information. It additionally consists of creating new strategies for producing artificial macro indicators and even enabling dynamic mapping of vulnerability and many others. could comprise.

The final word aim is the creation of a web based vulnerability information visualization device. updatable within the space for various audiences. Subsequently, the device is very helpful for native determination makers,public coverage overview on flood dangers by way of monitoring of the results of actions taken regionally. On this respect, the vulnerability visualization device may even represent a call assist device.


[1] For the reason that starting of 2020, a venture staff has been arrange inside Cerema to work on a device (within the type of a Qgis plugin) and their processing that allows the “computerized” calculation of those indicators, facilitating information assortment. An illustration of this device, specializing in a number of indicators, is scheduled for the top of 2022 (extra info on the finish of this text).

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