Sewerage is also a priority for the general public and a major worry for public authorities. There are three main reasons for this : | - The awareness that the facilities are not up to date in many old cities
| | - The awareness thatin every cities sewerage is absolutely necessary
| | - The "climate change" vs "urbanization" makes storms'consequences in term of floods or pollution more devsting than before.
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In some cities, only underground treatment plants can meet the new requirements in term of depollution, beeing installed as near as possible to production and river discharge areas. Their construction is possible thanks to new processes permitting to build compact, nuisance-free plants.
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