Sadocca dewatering pump

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Pianta dello stabilimento con sezione della prevista ruota a schiaffo. Plan of the plant with section of the planned water wheel.

Prospetto del fabbricato e della ruota a schiaffo. Perspective drawing of the building and of the water wheel.

Sezione dello stabilimento. Section of the building.

Spaccato longitudinale con indicazione della collocazione di ruota e caldaie. Longitudinal section with location of the wheel and of the boilers.

Sezione della ciminiera e dettaglio delle capriate. Section of the chimney stack and details of the timber roof truss.

Casa d'abitazione per il macchinista annessa allo stabilimento idrovoro. Engine personnel’s house attached to the dewatering pump.

Il complesso idrovoro nel 1912. The dewatering pump in 1912.

Stabilimento Sadocca in pianta, con indicazione dei motori diesel della ditta TOSI. Sadocca dewatering pump plan, with illustration of the location of the diesel engines created by the company Tosi (1922).

Lavori per il rialzo e la sistemazione degli argini del collettore Padano-Polesano, del canale Sadocca esterno e di conterminazione della bonifica

Lavori per il rialzo e la sistemazione degli argini del collettore Padano-Polesano, del canale Sadocca. Work of raising and arrangement of the banks of the Padano Polesano manifold, of the Sadocca Esterno canal

Corografia allegata al progetto 13.03.1944. Chorography attached to the project of the 13th of March 1944.

Relazione 30 maggio 1947. Second section of the hygienic restoration work in the areas flooded by the German Army in September 1944.

Idrovora Sadocca: rinforzi con sacchi di sabbia per contrastare le piene del novembre 1966. Sadocca dewatering pump: reinforcements made with sandbags to hinder the floods of November 1966.

Idrovora Sadocca: riparazione danni delle piene del novembre 1966. Sadocca dewatering pump: repair of damage caused by the floods in November 1966.

Idrovora Sadocca: lavori di riparazione e rinforzo dello stabilimento danneggiato dalle piene del novembre 1966. Sadocca dewatering pump: repair and reinforcement of the building which was damaged by the floods in November 1966.

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NAME: Idrovora Sadocca (Sadocca dewatering pump)

LOCATION: Porto Viro (Ro)

ORIGINAL CONSORTIUM OF BELONGIN: Consorzio per la Bonifica Polesana (consortium for the restoration of Polesine) (1890-1970)

DATE OF CONSTRUCTION: 1897-1902

DESIGNER: engineer Carlo Veronese

HISTORICAL NOTES:

The restoration project in the Acque Dolci area, in Contarina, was undertaken by the consortium for the restoration in Polesine which, at that time, had already been working on the construction of the Padano Polesano manifold. The restoration was essential because the excavation of the new canal had caused damage to the previously existing buildings, and it was, therefore, vital to speed up the creation of the two new dewatering pumps (Sadocca and Vallesina) envisaged by the project of the 14^th of December 1898.

The first interventions carried out on the Sadocca basin were completed in 1902 and paid for in 1903: in addition to the arrangement of the drains, there was also the construction of the dewatering pump and the road, on the border with Valli Salse, that belongs to the protected area of the Venice Lagoon.

According to the original project, Sadocca pumping station was supposed to be equipped with a water wheel at the out-flow of the Sadocca Esterno into the Po di Levante but, in the end, when it came time to get down to work, the wheel was replaced by two steam engines that could start just as many turbines: given the urgency, the machines were turned on in 1897, i.e. before the construction works were completed.

When Chiavichetta and Ca’ Giustinian dewatering pumps, which were built between 1914 and 1921, started working, some changes had to be made to adapt Sadocca dewatering pump to the new flow rates: between 1926 and 1927, the turbines were removed and two powerful diesel engines created by the company Tosi were installed and connected to two centrifugal pumps. The old machines and the replaced sluice gates were sold in November 1926.

One of the pumps was later powered with electricity, although, in the event of a blackout, it could still be powered by the diesel engine.

In 1950, the progressive subsidence of the land that was hindering the effectiveness of the plant made it necessary to adapt the dewatering pump to the changed conditions: in 1960 the land surrounding the plant seemed to have sunk between 1.60 and 1.70 metres. In order to prevent overflows into the drainage basin during high tides, the walls of the basin had to be raised and reinforced and tunnels that the rising water could overflow into had to be closed.

Further work was carried out after the coastal storm of the 4^th of November 1966: the water got over the top of the protective wall and caused serious damage to the masonry work of the vaults of the drainage ducts and to the tunnel that originally allowed the natural flow of water and which had been blocked to cope with the lowering of the ground.

To date, despite the numerous changes and improvements it has undergone over the years, Sadocca dewatering pump still retains its original charm.

Index

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Project funded by Regione del Veneto – L.R. 5/09/1984 n. 50, art. 44 – DGRV n. 618 del 11 maggio 2021 e n.1411 del 12 ottobre 2021 – Decreto del Direttore della Direzione Beni Culturali e Sport n. 325 del 27.10.2021

Photos Alberto Bonatti