f Non-destructive testing methods for scanning the near environment of buried sewer pips

At the present time, sewer systems are the most degraded urban infra-structure. In France, we estimate that the proportion of deteriorated sewers needing renovation is about 5% of the total linear, which represents 8000 km of non-visitable canalizations. The costs of reparation can be estimated between 50 and 100 billion francs.