Leau souterraine est une ressource de valeur qui porte les avantages sociaux et financiers pour un région s’il est bien développé et géré.
Par conséquent c’est impératif que les ressources en eaux souterraines soient protégées et utilisées effectivement.
L’usage responsable des eaux souterraines nécessite généralement la mise en œuvre des programmes de surveillance du niveau de la nappe phréatique et la qualité de l’eau pour comprendre :
- La performance du nouveau forage, et
- Comment l’aquifère réagir au pompage.
Un programme de surveillance à long terme qui générera une quantité des données significative qui aura besoin d’une bonne system de la gestion.
Groundwater Relief offre l’appui technique aux organisations avec l’établissement et la gestion des programmes de surveillance, le développement des modes d'exploitation normal (SOPs), systèmes pour la gestion des données et aussi le développement des modèles numériques pour la simulation des aquifères.
Pour aider nos activités nous avons développé deux outils :
C’est un site web qui permet aux organisations à récupérer et partager les données techniques des forages.
Un outil abordable pour mesurer la nappe phréatique.
Case Study:
Groundwater Supply in Cox's Bazar
Groundwater Relief has been working in Cox's Bazaar, Bangladesh since November 2017. Five hydrogeologists have been embedded with Medecins Sans Frontieres Holland (MSF-OCA), on 2-4 month rotations supporting the drilling of multiple wells in the Kutupalong Mega camp. Many improvements in well installation and groundwater development have been implemented over this time in collaboration with MSF-OCA engineers.
Since early 2019, Groundwater Relief, in partnership with Dhaka University, has been working on an International Organisation for Migration funded project to define the sustainability of groundwater resources within the District in order to support the Department for Public Health Engineering (DPHE) with providing sustained water supplies to both the Rohingya refugees and the host population.
The work has led to the remapping of the geology of the District; the development of the first regional groundwater model for the District; and the set up of a regional groundwater monitoring programme.
An online map showing data collected during this intervention is available here:
The new geological map of the district can be viewed here:
https://www.dropbox.com/s/hyeo...
The technical report that outlines our conceptual understanding of the aquifer systems in Cox's Bazar can be viewed here:
https://www.dropbox.com/s/7ly9...
Groundwater Assessment, Bentiu POC
The International Organisation for Migration (IOM) commissioned Groundwater Relief to assess the groundwater infrastructure at the Bentiu POC, hosting over 120,000 people at the time of the assessment.
Groundwater Relief’s assessed the capacity and efficiency of each of the boreholes at the camp through carrying out pumping tests on the existing boreholes and borehole camera surveys to investigate borehole condition. Recommendations were made to improve the utilisation of the existing groundwater supply infrastructure (primarily by installing higher capacity pumps and lowering pump intake depth) improving output from the existing boreholes by an additional 50%, dramatically increasing water output for the camp population.
The work resulted in a robust hydrogeological conceptual model of the site area being developed. Two distinct aquifer units were observed, ‘upper’ and ‘lower’, each with differing hydraulic properties and water chemistry, separated by a laterally extensive (semi) confining clay layer. Geological logs were built into a 3D geological model, which was used to investigate this two aquifer system. This advanced hydrogeological understanding will allow long term impacts of groundwater extraction to be understood better, and inform the drilling of future boreholes.
In addition a groundwater monitoring programme was established for the site using automatic and manual instrumentation. Local and international site staff were trained in basic hydrogeological data collection, to ensure the long term success of the monitoring. This monitoring programme will provide highly valuable information about the long-term aquifer water levels and allow IOM to make technically sound decisions regarding future groundwater supply at the camp.
