Expertise - SONDALP

Technical assistance to operators

Our hydrogeologic experts carry out missions in France and abroad :

Technical assistance to tenders for public service delegation
Management of a drilling park and their pump
Optimization of CAPEX / OPEX
Sizing of maintenance programs
Auditing assets / pump asset management procedures
Audit of the data transfer chain: acquisition / remote transmission
Assistance with the implementation of performance indicators: KPI
Definition and monitoring of short, medium and long-term action plans
Training-coaching production teams / Maintenance / Technical direction

Our experts will help you from the rising to the successful completion of your projets.

Active management of the water source

Artificial groundwater recharge usually involves re-injecting surface water into the aquifer and has many advantages:
• Permanently maintain a good quality water supply in exploitable conditions and in a context of intensive use.
• This water becomes an alternative resource that guarantees the supply for drinking or non-drinking uses in case of drought.
• In some situations, it helps to lower the cost of water.
• It allows a significant purification of water on certain parameters (bacteriology, iron, ammonium, manganese, etc.).
• The device also includes the control of the intrusion of seawater in the tablecloths situated at the seaside.
Already used in large cities in many countries, the technique of groundwater recharge is well controlled.

Case study 1

Hyères the palms

It is notable that our experts are the only ones to have commissioned and managed the operation of such artificial recharge solutions in France for 20 years.

Hyères, a coastal tourist town in the South of France, sees its population triple in summer. The overabundant exploitation of the alluvial aquifer has considerably reduced the availability of freshwater resources by salt water intrusion, especially during drought periods. This has led to large purchases of water. The city of Hyères and SUEZ have developed a program for the rehabilitation and restoration of groundwater exposed to saline intrusions and aimed at giving Hyères back its autonomy in water. The solution proposed is simple: recharge the aquifer via a small coastal river (Roubaud), close to the site and well fed in winter. A re-filtration pond has been created; it is fed to the river by means of a water intake and two kilometers of driving. Thanks to this system, for the past two years, SUEZ has been reloading the water table in winter, allowing the resource to be exploited in summer with a sufficient water supply to meet the water needs and to limit the advance of the salt wedge. With 650,000 cubic meters re-infiltrated each year, the city can produce six million cubic meters of water a year, with a target of 97% autonomy in the long term. To know more Aquarenova project at Hyères les palmiers

Case study 2

Flins Aubergenville

Located 30 kilometers west of Paris, the aquifer feeds 700,000 inhabitants. In the 1960s, when the demand for water increased, the number of boreholes also increased, gradually depleting the water table. To replenish it, the water was pumped into the Seine, then treated, before being stored in sand pits. A treatment that generated each year several tons of sludge. The studies conducted by SUEZ have made it possible to improve the system while reducing the environmental footprint. Thus, since 2000, the water intake is no longer directly in the Seine, but by drilling located on the banks of the river, about twenty meters. The recovered water is naturally filtered through the banks and contains no mud. This technique, called geofiltration, avoids a thousand tons of silt per year, an ecological process that uses natural soil filtration capabilities and avoids traditional chemical treatments.