Diga del Panperduto, Water management system in Somma Lombardo, Italy.

The Dighe del Panperduto are a set of hydraulic works near Maddalena, in Somma Lombardo, where part of the Ticino is diverted into the Villoresi and Industrial canals. A long masonry building with a round-arched arcade and the inscription "CONSORZIO VILLORESI" stands above a low weir; a walkway with metal railings crosses the water, and a rusted toothed arc and ring mechanism sit on a stone ledge.

The need to irrigate the land north of Milan led engineers Eugenio Villoresi and Luigi Meraviglia to propose a double diversion from Lakes Maggiore and Lugano, granted by decree on 30 January 1868. After Villoresi's death the concession passed to the Società Italiana per le Condotte d'Acqua, and his son Luigi oversaw construction. The hydraulic junction was inaugurated on 28 April 1884 with the first water entering the Canale Villoresi; the canal reached Lainate in 1886 and Cassano d'Adda in 1891, while the Lugano branch was abandoned.

The name Panperduto may come from the boatmen's cry "Em perdù'l pan da la giurnada!", recalling loads lost in the rapids before the basin was built; others link it to time wasted on an unfinished canal between Lake Maggiore and Milan. Since 2016 the Museo delle Acque Italo-Svizzere, housed in a former maintenance building on the island of Confurto, explains the water's use for farming, food, landscape and electricity.

The structure is located near Malpensa Airport and is relatively easy to reach. The navigable basin section allows visitors to observe the operational mechanisms of the installation.

The Museo delle Acque Italo-Swiss, opened in March 2016 on the island of Confurto, occupies a former maintenance building for the dams. Its floor carries a 1:1500 map of the Ticino from Sesto Calende to Vizzola Ticino, and it anchors a 2 km ecomuseum trail past the intake works, the Ticino weir, navigation locks and the Villoresi and industrial canal inclines.