What distinguishes a wash house from a tank?

The tank is a reservoir of water, often associated with irrigation or livestock; the wash house is a structure designed specifically for washing laundry, with sloping basins or beating slabs. Many wash houses incorporate one or more tanks for soaking and rinsing.

What is a nória (waterwheel)?

The nória is a water-raising device introduced to the Iberian Peninsula in the Islamic period. It consists of a wheel that lifts a chain of small buckets (alcatruzes), usually driven by animal traction, emptying the water into a tank or irrigation channel.

Do wash houses still exist in Portugal?

Yes. Although the arrival of piped water and the washing machine has made their use marginal, many wash houses survive in towns and villages, and are increasingly valued as ethnographic heritage and the object of municipal restoration.

Wash Houses, Tanks and Wells

Before piped water reached people’s homes, entire communities depended on a modest but indispensable set of everyday hydraulic structures: wells to draw water from the subsoil, waterwheels and shadufs to raise it, tanks to store it and wash houses in which to wash their laundry. Brought together under the term vernacular hydraulic heritage, these works are rarely signed by architects or inscribed on lists of monuments, yet they constitute one of the most eloquent testimonies to the relationship between rural populations and water over the centuries.

Drawing and raising water

The well is the most elementary way of reaching the water table. Around it, however, a remarkable popular engineering developed, designed to overcome the effort of bringing water up to the surface. The picota — also called cegonha, burra or balança in different regions — is the simplest device: a long pivoting pole resting on a fork, with a bucket on one side and a stone counterweight on the other, which makes it possible to draw water from shallow wells, ditches and streams.

The picota, of elementary and almost universal mechanics, was for centuries the most widespread instrument for drawing water in Portugal, from the North to the Alentejo, before being replaced or complemented by more elaborate devices.

More sophisticated is the nória, introduced to the Iberian Peninsula in the Islamic period. It is a vertical wheel that drives a continuous chain of alcatruzes — small clay or metal vessels — which dip into the well, rise full and pour the water into a tank or channel. Usually driven by animal traction through a system of gears, the nória made it possible to irrigate vegetable gardens and orchards with a constant flow, even becoming a symbol of agricultural wealth in some regions. This logic of harnessing water mechanically is carried further in the water mills and tide mills, where the current, instead of being raised, is converted into motive power.

Storing and distributing

The tank is the reservoir that articulates the whole system. It collects water from the waterwheel, the spring or the rain and regulates its distribution for irrigation or consumption. Built of masonry, stone or hydraulic mortar, it appears isolated on farms or integrated into larger ensembles, in dialogue with the supply networks that run from urban fountains to the great aqueducts that carried water over long distances. In many cases, the same tank served successive functions: first drinking water, then washing and, finally, the irrigation of crops.

The public wash house is the most characteristic expression of this typology. It became widespread above all from the late nineteenth century, when the lack of domestic water and the precariousness of hygiene conditions led local authorities to build dedicated places for washing laundry, removing it from rivers and streams. Its architecture ranges from the large collective tank, with slabs of polished granite for beating the laundry, to sets of individual cells, with one tank for washing and another for rinsing. Frequently roofed by sheds resting on columns, they protected the washerwomen from the sun and the rain.

More than infrastructure, the wash house was for generations an eminently feminine space of sociability — a place of conversation, of song and of the transmission of news and collective memory. Its decline accompanied the arrival of piped water and the washing machine, but the growing awareness of its ethnographic value has prompted restoration campaigns throughout the country.

A heritage to preserve

Because of their discreet scale and utilitarian function, wash houses, tanks, wells and waterwheels were for a long time absent from heritage classifications. Today, they belong fully to Portuguese vernacular architecture and are recognised as structuring features of the rural and urban landscape. To conserve them is to preserve not only devices and structures, but a whole body of know-how and a way of life organised around the most essential of resources: water.