Restructuring of the sewerage network of the municipality of Casamicciola on the island of Ischia (Italy)

The existing sewerage system of the municipality of Casamicciola consists of a network of plastic pipes which collect both sewage and rainwater from surface runoff. The networks, which serves less than 30% of the population, is seriously under-scaled and during heavy rain pipes and gullies often burst with consequent flooding of cellars and basement areas.

The purpose of the project is to separate the rainwater and sewage by creating two separate pipe systems: in particular, the existing system, as far as it can be re-utilised, will serve to collect the rainwater and a new network will be built to collect the sewage. 

The sewage will be pumped to the nearby municipality of Lacco Ameno where a treatment plant for civil sewage is under construction.  The new system will serve almost 80% of the population.

One of the main activities involved was the survey of the present situation carried out using both traditional methods (topographic survey and definition of the levels of the gullies) and modern techniques (video inspections and endoscopic investigations). 

The design also took into consideration the question of the thermal waters as Casamicciola has numerous thermal installations which discharge into the municipal sewerage system.