Sewer Network Maintenance in Nîmes Métropole

The sewer network maintenance in Nîmes Métropole focuses on ensuring the smooth flow of wastewater to prevent issues for residents and protect the environment. This involves regular cleaning to avoid blockages, overflows, and backflow of wastewater, which can cause problems in homes, public areas, and nature.

Cleaning Process and Equipment

When a pipeline is blocked, maintenance starts with a pre-diagnosis by opening manholes to locate the blockage and assess the pipeline. The main types of pipes are PVC, though some older ones are made of asbestos-cement, which requires special safety protocols. A hydro-jetting truck is then used, along with safety markings, to clean the pipeline using high-pressure water that can exceed 200 bars.

Preventive and Curative Maintenance

Nîmes Métropole carries out both preventive and curative maintenance. Preventive cleaning is done annually based on past interventions and network assessments, covering about 170 km of pipes each year. Curative unclogging, which happens about 1,800 times a year, is done in emergencies after reports from residents, with teams working 24/7.

User Responsibility and Network Challenges

Users play a key role in preventing sewer problems. Flushing wipes down toilets, especially since the start of the pandemic, has caused many blockages. Restaurants are encouraged to use grease and starch separators and properly dispose of used oil. Homeowners should check their connection box, usually near their house, at least once a year.

Efficiency and Safety in Operations

The success of the sewer network is measured by user satisfaction and the safety of maintenance workers. Preventive work aims to make problems invisible to users, meaning the job was done effectively. Nighttime interventions help reduce disruptions to traffic and businesses, while safety remains the top priority for workers in this high-risk job.