WATER SUPPLY & SEWERAGE
Sewerage system for S. Pietro in Volta - Venice Lagoon - Italy

Client:                          Consorzio Venezia Nuova for Ministry of Public Works – Water Board - Venice

 Services:                    Surveys and investigations; Preliminary design                               

 Period:                        1991 - 2000

 Construction cost:   € 4,131,700    

 The project:

The project concerned the preparation of the preliminary design of the sewerage system for the town of San Pietro in Volta in the context of the project to protect the town from the high tides.  

Two alternative solutions were studied: one for mixed sewage and one with separate networks for rainwater and waste water.

In the case of the mixed sewage network, it is designed to operate for a certain period until the Municipality of Venice sets up a treatment plant connecting the secondary sewerage pipes from the houses and the lagoon. These sewers, which have little or no gradient, are kept clear by the tidal flow. The system will operate only in occasion of the high tides, when the sewerage outlets into the lagoon have to be closed to prevent the tidal flow from rising up through the rainwater gulleys. The sewage is disposed of by pumps which at present convey it directly into the lagoon by means of underwater pipes and diffusers and which in the future, when the new treatment plant has been built, will provide the necessary head to convey the sewage there.

The system with separate networks foresees using the existing secondary network for the disposal of rainwater into tanks connected to the lagoon by check valves and pumps. These tanks will operate only in the event of high tide when the valves shut. The waste water network on the other hand is entirely new.

The project affects the entire historic centre, the system having a total length of 2500 m.

The works have been completed.

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