top of page

Risks: water and soil

Improve the quantity and quality of water and soil

The ACMG analyzes the risks associated with climate change and their impacts on soils and surface or deep water. The technical service produces land use maps at the watershed scale by processing satellite images (radar and optical), implements water level monitoring observations, participates in work on recharge water tables and soil erosion.


Identify risks with the radar satellite

Evaluate the risk of erosion under all weather conditions


Measure water levels

Warning system
Support for watershed management


Flood mapping

Impact assessment using radar satellite imagery


Improve the quality and quantity of water

Solutions for natural recharge of the alluvial water table, …

Ferme de légumes

Improve soils

Impact assessment
Technical solutions


A project ?

A need?

Observe impacts via satellite

Ancre 1

Knowing the land use of a watershed makes it possible to target areas at risk of runoff, to rethink the vegetative covers of the basins, to improve water retention.

In order to be able to observe the soils during intense climatic periods, the ACMG has innovated and today uses the RADAR satellite to map four land uses within the watersheds: active vegetation, bare soils, vines, woods.


Sensitivity of soils to erosion in the Labourdasse watershed

Example of use of cards:

  • Development of the edges of watercourses

  • Quantification of bare soils from 2015 to 2020 within watersheds

  • Change in the proportion of active vegetation over the year, month by month

Measure water levels

Ancre 2

" Réagir puis agir "

In order to develop watersheds, manage low water levels and warn about the risk of flooding, ACMG is developing and testing, within the framework of the European projects RiskAquaSoil and ClimAlert, a new station transmitting information from sensors every 12 minutes. water level supplemented with meteorological parameters.

The ClimAlert program makes the data available for the Moyen Garonne on the platform.


Water level station (Sérac - 47)

Contribution of the sensors:

  • Quick setup

  • Sending the water level every 12 minutes for near real-time monitoring.

  • Possibility of defining an alert threshold to be warned of the rise in the water level by SMS, voice message, email.

  • Moderate cost


Courbe de hauteur d'eau sur

Connected to meteorological stations and soil moisture probes, these sensors make it possible to relate climatic hazards, the soil's water retention capacity and the state of the watercourse. Linked together, this information makes it possible to alert in real time and then to think about solutions adapted to the specificities of the basin.

Flood mapping

Ancre 3

" Anticipate climatic events "

The ACMG maps the extent of flooding from satellite radar images in order to meet the needs of waterway managers, local communities, emergency services and municipalities in their implementation of adaptation strategies. and risk management.

This service offers the possibility:

  • To observe the extent of the impacts over a large area in order to respond as quickly as possible to the needs of emergency services as well as to the various managers in the territory.

  • To observe the evolution of the flooded area day after day according to the availability of satellite images (map with in yellow and in red according to evolution between the 27th, 02nd and 03rd).

  • To establish the history of flooding over time: radar data available since 2015, optical data since 1985-1990 on certain areas.

  • To understand the origin of the phenomena and to model the risks and future impacts if necessary by linking for example the extent of the floods with the occupation of the watersheds, the quantity of fallen water, the water retention capacities of the soils, etc.

This mapping service can be combined with the early warning service (flood warning) set up as part of the Interreg ClimAlert project within the rivers of rural areas of Lot et Garonne and Dordogne.


Flood of the Garonne river in February 2021

bottom of page