The Liquid Arteries of Lucca: The Nottolini Aqueduct and the Geomorphology of the Vorno Springs

Stretching across three kilometres of Tuscan farmland on 460 brick arches, the Nottolini Aqueduct is the most architecturally ambitious monument in the Lucca countryside — a Neoclassical hydraulic machine that reads, from a passing train or car, as something unmistakably Roman. It is not Roman. It is nineteenth century, and it is the culmination of a geomorphological story that begins in the limestone and schist folds of Monte Pisano, where filtered groundwater gathers in the springs above the hamlet of Vorno and descends, still today, toward the city that has always depended on them.

Construction span: The aqueduct was built between 1823 and 1851 under the direction of architect and engineer Lorenzo Nottolini, with water first reaching Lucca’s Piazza San Martino in June 1832.
Scale and structure: 460 brick and masonry pillars carry 459 semicircular arches at a height of approximately 12 metres over 3.2 kilometres; 28 evenly spaced buttresses reinforce the line at every seventeenth arch.
Spring sources: Approximately 18 springs from three distinct source zones — Serra Vespaiata, Rio San Quirico, and Rio della Valle — supplied the aqueduct, gathered in a natural valley on the northern slopes of Monte Pisano above Guamo.
Dual water channels: Nottolini separated the water into two parallel conduits running side by side above the arches — purer spring water directed to residential and drinking fountains, less pure surface water to the city’s monumental fountain network.
Geological context: Monte Pisano is a low metamorphic massif extending between the Serchio and Arno valleys; its northern slopes collect precipitation filtering through alternating limestone, sandstone, and phyllite layers that produce cold, naturally clarified spring water of exceptional quality.
Current status: The aqueduct no longer carries water above ground — a modern underground pipeline follows the same route — but the masonry structure remains largely intact, interrupted only where the A11 motorway removed six arches in the twentieth century.

Introduction: Lucca’s Chronic Thirst and the Architecture of a Solution

Water has always been the unsolved problem of Lucca. The city sits on a shallow alluvial plain enclosed by Renaissance walls, surrounded to the south by the limestone flanks of Monte Pisano and to the north by the Serchio river. For the ordinary Roman town of Luca, some form of aqueduct existed — traces suggest an underground conduit running from the Moriano area to internal fountains — but the system deteriorated and eventually disappeared entirely, leaving a medieval and early modern city dependent on shallow wells whose water quality ranged from mediocre to dangerous. The wealthy families of Lucca had long understood the geology of the surrounding hills: they paid to have spring water carried privately from Monte Pisano slopes to their town palaces, a privilege that made their households vastly healthier than those of the urban poor who drew from contaminated groundwater.

Enlightenment thinking arrived in Lucca in the eighteenth century in the form of public health arguments. The connection between stagnant well water and epidemic disease was not yet germ theory — that would come half a century later — but it was epidemiologically legible to attentive observers. In 1732, the hydraulic engineer Giuseppe Natalini produced a study proposing to draw water from Badia di Cantignano. Thirty years later, in 1763, funds were allocated to study a route from the mountains above Guamo, and the hydrographer Attilio Arnolfini recommended those specific slopes after consulting numerous engineers and practical men. Nothing was built. The politics of small Italian states, the disruptions of Napoleonic reorganisation, and the sheer technical complexity of carrying water nearly four kilometres across flat agricultural land conspired against every project.

Between 1812 and 1814, the French engineer de Sambucy began work on an aqueduct under the Bonaparte court of Princess Elisa Baciocchi; the project was suspended when the Baciocchi government collapsed. It was finally Maria Luisa of Bourbon, installed as Duchess of Lucca after the Congress of Vienna in 1815, who resolved to act. In 1822 she approved the construction of the aqueduct and entrusted it to the man she had already appointed Royal Architect — Lorenzo Nottolini — asking him to modify de Sambucy’s scheme and build something worthy of a capital city. The result, constructed between 1823 and 1851, drew on the springs of Monte Pisano with a sophistication of geomorphological intuition and engineering invention that still merits close examination.

The Geological Foundation: Monte Pisano and the Hydrogeology of the Northern Slopes

To understand why the Vorno Springs exist where they do — and why their water possesses the qualities that made them the preferred source for centuries of Lucca’s planners — it is necessary to understand the structure of Monte Pisano itself. The massif is not, despite its modest profile, a simple geological entity. It is a complexly deformed fragment of Tuscan metamorphic basement whose tectonic architecture concentrates groundwater in precisely the zones where Nottolini’s engineers placed their intake structures.

The Tectonic Identity of Monte Pisano

Monte Pisano extends in an elongated oval from northwest to southeast, separating the Lucca plain from the Pisa plain and forming the southernmost expression of the Apuane Arc — the metamorphic chain that includes the Apuan Alps to the north with their famous Carrara marble. The massif rises to a maximum at Monte Serra (917 metres) and covers a territory spanning the municipalities of Lucca, Capannori, Buti, Calci, San Giuliano Terme, Vicopisano, and Vecchiano. Structurally it belongs to the Ligurian and sub-Ligurian tectonic units of northern Tuscany, composed principally of low-grade metamorphic rocks equivalent in character — though not in degree — to the high-grade marbles of the Apuan Alps proper.

The fundamental geological architecture of Monte Pisano consists of two superimposed metamorphic units separated by a major overthrust fault. The upper unit, known as the Unità di Santa Maria del Giudice, rests tectonically upon the lower Unità di Monte Serra along a fault oriented NNE-SSW. This contact, observable in several exposures between Vorno and Asciano, produced intense shearing and a zone of strong tectonic deformation called the Zona a Scaglie del Faeta. Above both metamorphic units, the Tuscan Nappe — a broadly carbonate sequence — was thrust over the entire stack during Miocene compressional tectonics, though its cover is now preserved only as isolated remnants (klippen) at La Croce, Caprona, San Giovanni alla Vena, and other localities along the western flanks.

The primary lithologies exposed on the northern slopes above Vorno and Guamo consist of alternating phyllite, metasandstone, calcareous schist, and marble-like limestone. The phyllites, derived from fine-grained sedimentary precursors metamorphosed at low temperature and pressure, are effectively impermeable. The calcareous and sandy schists are variably fractured and locally karstified. This alternation of permeable and impermeable layers, tilted at moderate angles and cut by abundant joint sets, is the hydrogeological engine that generates the springs: infiltrating rainfall percolates downward through the fractured calcareous and sandy layers until it encounters a phyllite horizon, whereupon it moves laterally until it reaches the surface — typically along a topographic break or at the boundary between two lithological units.

Spring Formation Mechanisms on the Northern Slopes

The northern slope of Monte Pisano receives more precipitation and maintains higher humidity than the south-facing Pisan flank, because it intercepts moisture-bearing air masses moving inland from the Ligurian coast and is partially sheltered from the driest Tramontane winds. This asymmetry sustains a spring regime on the Lucca side that has no equivalent on the Pisa side at comparable elevations. The springs that feed the Nottolini system emerge principally between 150 and 400 metres above sea level, in several distinct valley systems cut into the northwestern slope above the hamlet of Guamo.

The spring water of Monte Pisano is described in historical sources consistently as cold, light, and of exceptional purity. Antonio Mazzarosa, writing in the 1840s, noted that the water passes through successive layers of gravel and stone before reaching the surface, a natural filtration process that Nottolini replicated artificially in his purification cisterns. The municipal tourism authority of Lucca states that the geological nature of Monte Pisano gives its water a taste and lightness veramente particolari — genuinely distinctive — and to this day locals fill containers at the free-flowing public fountains fed by the same source system. The Lucca Tourism Office describes the Monte Pisano northern slope as collecting rains from inland Tuscany and being fresh and rich in curative spring water. This reputation is not mythological; it reflects the real hydrochemistry of waters filtered through calcareous metamorphic rocks that remove sediment and iron oxides while imparting a modest mineral content of calcium and magnesium carbonates.

Three principal source zones contributed water to the Nottolini system. The Serra Vespaiata, a natural collection saddle where the waters of the Rio San Quirico and Rio della Valle were concentrated and directed into a built intake structure, provided water of lower purity classified as second-grade by Nottolini’s engineers. The pure spring water — classified as potable and directed to residential fountains — issued from approximately eighteen individual sources within the broader Vorno spring zone, emerging from contact springs along lithological boundaries at various points on the slope. Nottolini’s system captured both categories and kept them physically separate from intake to delivery.

The Serra Vespaiata and the Rio San Quirico Valley

The Serra Vespaiata is the most architecturally elaborate component of the upstream water-collection works. It is an engineered weir and collection structure built at the point where the Rio San Quirico and the Rio della Valle converge, in a narrow wooded valley above Guamo. The name of the locality — universally known as Le Parole d’Oro, the Words of Gold — derives from a commemorative Latin inscription carved in stone on the main collection bridge and originally set with brass letters that gleamed in sunlight. Local farmers, mistaking the brass for gold, stripped the letters to sell them; the inscription was subsequently repainted gold, and the name has clung to the place ever since. The full Latin text, translated, reads that Duke Carlo Ludovico of Bourbon, in the sixth year of his rule, provided for gathering waters from multiple spring mouths and conveying them more abundantly to the city’s aqueducts with eternal movement — a phrase of hydraulic optimism that has proven approximately correct.

At the Serra Vespaiata, Nottolini designed water to flow over a flagstone-paved channel set in the bed of the Rio San Quirico, visible above ground while a gallery beneath collected and directed the percolating groundwater. This arrangement — surface water flowing visibly over dressed stone while purer spring water gathered in the underground gallery below — reflected Nottolini’s characteristic precision in distinguishing water qualities and routing them independently from the moment of capture. The paved stone channel protected the gallery from contamination while simultaneously serving as an aesthetic element: the alignment of stone flags along the stream bed, framed by brick collection structures and chestnut woodland, constitutes one of the most distinctive hydraulic landscapes in Tuscany, and it remains today the destination point of the popular Parole d’Oro walking trail.

The underground conduits carry collected water from the Serra Vespaiata northward and downslope through a series of brick-arched tunnels, emerging at intervals at inspection wells called bottini — a term borrowed directly from the medieval water-collection vocabulary of Siena, where a comparable underground aqueduct system called the Bottini supplied the city from the thirteenth century onward. The bottini of the Nottolini system are recognisable in the landscape as circular brick domes set flush with the ground, punctuating the fields above Guamo at regular intervals, each accessible by a ladder for maintenance inspection.

Centuries of Thirst: Lucca’s Water History Before Nottolini

The water problem Nottolini solved in the nineteenth century had been accumulating for more than a thousand years. Understanding its depth and persistence illuminates why the commission given to Nottolini was understood, from the beginning, as not merely a technical project but a civic act of the highest order.

Roman and Medieval Predecessors

Archaeological evidence suggests that Roman Lucca possessed some form of water supply from the Moriano area north of the city, probably an underground gravity conduit similar to those documented in other towns of Roman Etruria. By the early medieval period this system had failed entirely, leaving the walled city without running water. The response was the proliferation of shallow urban wells — a solution adequate for a small medieval population but catastrophically insufficient as the city grew and as the shallow alluvial aquifer beneath the Lucca plain became progressively contaminated by organic waste from cesspits, tanneries, dyeworks, and the general drainage of a dense urban environment.

Medieval and Renaissance Lucca was in many respects one of the most prosperous cities in Europe — a republic of silk merchants whose financial operations reached into Flanders and England, whose palace architecture rivalled Florence’s — yet it could not guarantee its citizens clean water. The wealthy drank and cooked with water brought down privately from the hills; the poor used wells whose quality varied seasonally and was routinely described in contemporary sources as malsana, unwholesome. Epidemic disease, especially summer dysentery, was a chronic urban reality attributed by physicians of the period to the water supply, even when the precise mechanism was not understood.

The first formal attempts to remedy the situation emerged during the Enlightenment, when hydraulic engineering became simultaneously more sophisticated and more closely linked to public health arguments. In 1732, Giuseppe Natalini proposed a route from Badia di Cantignano. In 1763, the Republic of Lucca funded a detailed study of the Guamo mountain source, with Attilio Arnolfini producing a comprehensive report recommending it. The project was approved in principle but never begun: the technical challenges of crossing nearly four kilometres of flat agricultural land, threading the conduit beneath roads and watercourses, and maintaining a sufficient gravity gradient to deliver water under pressure were not trivial, and the political will and financing to tackle them simultaneously never materialised during the republic’s remaining decades.

The Napoleonic Interruption and the Bourbon Mandate

When Napoleonic reorganisation dissolved the Republic of Lucca in 1805 and assigned the principality to Elisa Baciocchi, Napoleon’s sister, the question of the aqueduct was revived under different auspices. The French engineer de Sambucy was commissioned to design and begin the works in 1812 — the same year a young Lorenzo Nottolini arrived in Rome for his architectural studies. De Sambucy’s project was partially begun but suspended in March 1814 when Elisa Baciocchi’s government collapsed following Napoleon’s first abdication. The incomplete works and the accumulated hydraulic surveys were preserved, however, and became part of the technical inheritance that Nottolini later reviewed and modified.

Maria Luisa of Bourbon, who received the Duchy of Lucca at the Congress of Vienna in 1815, made the aqueduct a priority of her infrastructure programme almost immediately. She had met Nottolini in Rome — he had designed the refurbishment of her Roman residence at Palazzo Ercolani — and brought him back to Lucca in 1818 with the title of Royal Architect of the Royal House and Court. Four years later she gave him the commission that would define his professional legacy. The mandate was specific: solve Lucca’s water problem permanently, build something worthy of a capital city, and do not breach the Renaissance walls whose integrity the Duchy treated as sacrosanct.

Lorenzo Nottolini: Formation of a Royal Architect

Lorenzo Nottolini was born on 6 May 1787 in Segromigno, a village in the hills of Capannori territory that then lay within the administrative orbit of the Lucchese Republic. His early education was at the local seminary, where he showed aptitude for mathematics and drawing, and several of his brothers took religious orders while he chose an architectural direction. In 1807, aged twenty, he was recruited as assistant to Giovanni Lazzarini, the leading architect of the Lucchese court under Elisa Baciocchi, and worked on the renovation of the Villa Reale di Marlia — a project that exposed him to French Neoclassical taste via the influence of the court designer Théodore Bienaimé. He obtained his surveying qualification (diploma di agrimensore) in 1810 and was immediately appointed assistant to the chief engineer of the public administration.

The Roman Formation

In 1811 Nottolini received a French government scholarship to study in Florence at the Accademia di Belle Arti. From 1812 onward he expanded his study tour to Bologna, where he attended courses under the classicist Giovanni Antonio Antolini, and then to Rome, where he remained almost continuously until 1817. These Roman years were decisive. The Rome of 1812–1817 was still substantially the Rome that Piranesi had drawn and dissected in his great architectural engravings: a city of vast ruins, triumphal arches, bath complexes, aqueduct remnants, and imperial forums whose scale and spatial logic were without European parallel. Nottolini moved among this material with systematic intensity, studying not just the aesthetic surface of Roman building but its structural logic — the mechanics of semicircular arch construction, the geometry of barrel vaults, the way Roman engineers calibrated gradient in gravity-fed water systems to maintain flow velocity without erosion.

The aqueducts of the Roman Campagna — the Aqua Claudia, the Anio Novus, the Aqua Marcia — were among the most studied objects in Nottolini’s Roman years. Their technique of elevating a water channel on a continuous arcade of semicircular arches, maintaining a mathematically precise gradient of approximately 1 in 4000 from source to city, was a model of hydraulic efficiency that required no pumping, no mechanical intervention, and minimal maintenance beyond periodic inspection. Nottolini absorbed the principle completely, and when he designed the Lucca aqueduct fifteen years later, he replicated it almost without modification — adapting dimensions and materials to local conditions while preserving the fundamental structural and hydraulic logic of ancient Roman practice.

Nottolini’s Other Works in Lucca

The aqueduct is Nottolini’s largest and most celebrated work, but it exists within a broader programme of urban transformation that he directed for three decades as Royal Architect of Lucca. His most famous urban intervention is the regularisation of Piazza dell’Anfiteatro — the oval piazza that occupies the footprint of the ancient Roman amphitheatre, its elliptical form preserved in the curving facades of medieval houses built within and against the ruins. Nottolini did not create this space but rationalised it, clearing later encroachments, standardising the facade heights, and opening the four arched passages that today give entry to what is arguably the most atmospheric public space in any Tuscan city. The result is a masterpiece of Romantic Neoclassicism: the cold geometry of the imitation antique held in productive tension with the patina of genuine ruin.

Other significant works include: the refurbishment of the Palazzo Ducale; the design of the Observatory at Specola (1819); the regularisation of the Renaissance city walls as a public promenade with tree planting (a decision that made Lucca’s walls the earliest example of a complete urban walls-to-park conversion in Italy); hydraulic regulation works on the Serchio river; the Ponte delle Catene on the torrent Lima at Bagni di Lucca; and numerous fountains in the city centre, several fed directly by the aqueduct. He also designed bridges, roads, and the preliminary planning for Lucca’s first railway connection to Pisa. His death on 12 September 1851 — the same year the aqueduct was officially completed — was recognised as the loss of the Duchy of Lucca’s most consequential infrastructure mind.

Neoclassical Architecture Meets Hydraulic Engineering: The Conceptual Design

Nottolini’s decision to build the Lucca aqueduct as an elevated masonry arcade rather than an underground conduit was not inevitable. Underground pipes were already technically feasible in the 1820s, as demonstrated by the Aqueduct of Livorno designed by Pasquale Poccianti, which used a hybrid system of underground galleries and surface distribution. Nottolini considered underground routing and ultimately rejected it — partly for hydraulic reasons, but primarily for reasons of civic representation.

The Decision to Build Above Ground

An underground aqueduct would have been invisible. What Nottolini and Maria Luisa wanted was precisely the opposite: a monument that could be seen from the city walls, from the roads approaching Lucca from the south, from the fields and farmsteads of the Capannori plain. The elevated arcade was a declaration — that the Duchy of Lucca possessed the technical capacity, the financial resources, and the aesthetic ambition to build at Roman scale. It was infrastructure as propaganda, but also infrastructure as genuine civic investment in the appearance of the territory.

The gradient of the aqueduct from Guamo to San Concordio is minimal — a fall of approximately one metre per kilometre, sufficient to maintain water velocity without scouring the channel lining. This was the same hydraulic calculation Roman engineers had applied to their great aqueducts, and Nottolini applied it here with similar precision. The elevation of the channel above the plain surface (approximately 10 to 12 metres at standard points) was dictated by the need to maintain this gradient while bridging the slight undulations of the alluvial plain and crossing roads, irrigation channels, and farm boundaries without interruption.

The Dual-Channel System and Water Quality Classification

One of the most intellectually distinctive features of Nottolini’s design was his formal classification of water by quality and his construction of physically separate channels to deliver different grades to different uses. Two parallel conduits run side by side at the top of the arcade throughout its length. The first channel carried pure spring water from the Vorno sources — the water that emerged directly from the rock as contact springs, cold and already naturally filtered. This water was directed through the Tempietto di Guamo’s secondary purification system and delivered under priority conditions to the residential and potable-water fountains of the city. The second channel received water from the Serra Vespaiata collection — the run-off and stream-fed water of the Rio San Quirico and Rio della Valle, of lower purity but still substantially cleaner than urban well water. This second-grade water supplied the monumental fountains that decorated Lucca’s public squares.

This dual classification system reflects a sophisticated understanding of spring hydrogeology that goes well beyond the engineering manuals of the period. Nottolini understood that spring water issuing directly from the rock aquifer had passed through a natural purification process — adsorption of fine particles onto mineral surfaces, progressive clarification through sediment settling, natural disinfection by the oligotrophic conditions of deep groundwater — and that this quality could not be replicated in surface runoff even with extensive artificial filtration. By separating the two streams from the point of collection, he ensured that the superior spring water never came into contact with the more turbid surface water until after delivery — a principle of potable water management that remains standard in modern water treatment.

Structural Logic: Arches, Buttresses, and the Architecture of Span

The structural system of the Nottolini Aqueduct is a direct application of Roman masonry arch construction adapted to nineteenth-century brick and mortar technology. Each of the 459 semicircular arches spans approximately 6.5 metres between pillar centres, carried on square-plan piers of mixed brick and stone masonry. The semicircular profile — as opposed to the pointed or segmental arches used in Gothic and later industrial viaduct construction — was a deliberate aesthetic choice that aligned the aqueduct visually with Roman models, but it was also an efficient structural choice for spans of this width, distributing thrust forces symmetrically to both supporting piers without requiring the flying buttresses or ties that other arch profiles demand.

Every seventeenth arch in the sequence is flanked by a reinforcing buttress — a thickened pier element that projects perpendicular to the arcade axis and absorbs the accumulated lateral thrust that builds up along a long run of arches. Nottolini spaced these buttresses at regular intervals of seventeen arches and decorated them with a marble label bearing a sequential number, creating a rhythm of identical punctuation points along the otherwise continuous arcade. The effect from ground level is of a precisely calibrated visual tempo: sixteen identical arches, then a buttress-marked pause, then sixteen more arches, an organisational logic that reads as both structural necessity and aesthetic discipline. The numbered marble labels on each buttress served a secondary function as maintenance reference markers, allowing inspection crews to locate and report specific sections of the channel.

The materials of the aqueduct are primarily local: brick from the kilns of the Capannori plain, hydraulic lime mortar, and dressed stone for the arch soffits and pillar bases. The channel itself is lined with waterproof hydraulic plaster — a lime mortar mixed with crushed brick (cocciopesto) in the tradition of Roman opus signinum — which provides the watertight surface necessary to prevent seepage through the masonry. The double-channel top of the aqueduct is roofed with stone slabs to protect the water from evaporation, contamination by bird droppings, and the weathering effects of sun and frost.

The Two Tempietti: Architecture as Civic Symbol

The most architecturally distinctive elements of the Nottolini system are the two circular Doric temple-cisterns that mark its endpoints — the Tempietto di Guamo at the source end and the Tempietto di San Concordio at the city end. Both structures were designed simultaneously with the aqueduct itself and share the same Neoclassical architectural vocabulary, but they fulfil different hydraulic functions and occupy different symbolic roles in the landscape.

The Tempietto di Guamo: Collection and Primary Purification

The Tempietto di Guamo stands at the base of the Monte Pisano foothills above the village of Guamo, where the underground conduits from the spring intake zone discharge into an above-ground cistern. Built between 1823 and 1825, it is a circular building in Doric Neoclassical style with a domed roof, designed to receive water from the two upstream collection systems — the pure spring sources and the Serra Vespaiata surface water — and subject both to a preliminary purification stage before sending them northward along the elevated arcade.

The purification technology used in the Tempietto di Guamo is described in precise detail by Antonio Mazzarosa: the water is passed through successive layers of gravel and stone, then through a series of baffles and settling chambers designed to deposit suspended particles. The principle is simple gravitational sedimentation — water entering a progressively calmer chamber loses its turbulent kinetic energy and allows fine-grained sediment to settle to the bottom. Sixteen spouts, arranged around the inner circumference of the cistern, discharged the filtered water into a collection gallery, from which it was redirected into the dual channel system above the arches. The Tempietto di Guamo is today the starting point of the standard walking route along the aqueduct and the terminus of the Parole d’Oro trail from the spring sources above.

The Tempietto di San Concordio: Terminal Cistern and City Gateway

The Tempietto di San Concordio, built simultaneously with the Guamo structure between 1823 and 1825, is architecturally the more significant of the two. It stands just outside the Renaissance walls of Lucca in the neighbourhood of San Concordio — placed at this position because Nottolini modified the original project to eliminate the final 46 arches that would have carried the aqueduct directly into the city, reasoning that piercing the walls — even briefly — would compromise their architectural and defensive integrity. This decision, taken in consultation with the city’s engineering authorities, meant that the aqueduct ends at the walls’ edge and distribution continues underground.

The San Concordio cistern is a circular Doric building with a domed roof, substantially larger than its Guamo counterpart, functioning as both a final settling cistern and a pressurisation chamber. Water arriving from the aqueduct collected in a large double marble basin inside. From this basin it was discharged into two large-bore cast iron pipes — a technological innovation for Lucca at the time — that carried it under pressure southward beneath the city walls via a tunnel under the Baluardo San Colombano. The iron pipes were designed with a notable engineering refinement: expansion joints at regular intervals allowed the metal to lengthen and shorten with temperature changes without cracking, a provision Nottolini specifically noted had prevented the kind of pipe failures occurring in other contemporary aqueducts. The water was then distributed through a network of cast-iron mains to the fountains Nottolini also designed — the circular fountain in Piazza Antelminelli beside the cathedral being the most prominent.

At the base of the two flanking columns of the San Concordio tempietto, two stone lion-head spouts discharged water continuously — a deliberate visual echo of the classical Roman fountain, the nymphaeum, marking the end of the hydraulic journey from mountain spring to city fountain. These features, along with the decorated facades and the Doric columns of both cistern-temples, positioned the aqueduct within a recognisably Roman civic vocabulary while deploying materials and techniques of the 1820s.

A Hydraulic Machine in the Landscape: Territorial and Aesthetic Impact

The phrase used in Nottolini’s own time to describe the aqueduct — macchina idraulica, hydraulic machine — captures something important about its relationship to the landscape it crosses. It is not a building in the conventional sense; it occupies a linear territory four kilometres long and perhaps fifty metres wide, transforming a strip of agricultural plain into an extended architectural event. Travellers approaching Lucca from the south encountered the arcade as a horizon-spanning feature, its repeating arches reducing in perspective toward the city walls, its mass and scale evoking Roman monuments rather than contemporary industrial infrastructure.

The Neoclassical Ideal in Open Country

Neoclassical architecture in the Italian peninsula of the early nineteenth century was primarily a vocabulary of prestige buildings — theatres, academies, civic halls, ducal residences. What Nottolini did was extend this vocabulary to infrastructure in a way that was unusual even by the standards of his ambitious contemporaries. The decision to give the aqueduct a Doric order — the most severe and masculine of the classical orders, associated in theory and practice with public and military buildings — rather than the more decorative Ionic or Corinthian, was an architectural judgment of considerable intelligence. Doric columns and plain entablatures read clearly at distance and in all lighting conditions; they do not require proximity to reveal their character. An aqueduct seen from a moving carriage three hundred metres away must communicate its architectural quality in silhouette, and the Doric silhouette does exactly that.

Contemporary reception of the aqueduct confirms that this architectural strategy worked. The guides to Lucca published in 1829 and 1843 by Tommaso Trenta and Antonio Mazzarosa respectively devoted substantial attention to the aqueduct as an aesthetic as well as a utilitarian achievement. Giovanni Pacini’s Storia degli Acquedotti lucchesi of 1834, published while the aqueduct was still under construction, treated it as a monument of civic pride comparable to ancient Roman works. The nineteenth-century iconography of Lucca returned repeatedly to the aqueduct as a subject: engravings and watercolours captured its perspective recession, the relationship between the moving water implied by the structure and the static masonry of its supports, the way the arcade divided and organised the agricultural landscape through which it passed.

The Aqueduct as Civic Symbol Under the Duchy of Lucca

The commissioning of the aqueduct by Maria Luisa of Bourbon and the continuation of the project by her son Carlo Lodovico were not neutral acts of public administration. The Duchy of Lucca was a small, recently reconstituted state whose independence from the Grand Duchy of Tuscany was politically fragile and culturally sensitive. Building a Roman-scale monument — an aqueduct of the kind associated with the power and engineering ambition of empire — was a political statement about the status and permanence of the duchy, made in masonry and calcium mortar rather than in diplomatic correspondence. The Latin inscription at the Serra Vespaiata source, attributing the work to Carlo Lodovico in the sixth year of his reign, followed a convention of monumental self-commemoration that Roman emperors had employed and that Nottolini’s Roman training would have made him acutely aware of.

The choice to name the aqueduct not after its patron but after its architect — a usage that became established almost immediately in popular speech — was itself an unusual recognition of professional authorship. Lucca’s citizens called it the Acquedotto del Nottolini from the beginning, a naming that reflected both the personal identification of Lorenzo Nottolini with the city’s infrastructure programme and the scale of his individual contribution to the design, management, and refinement of the works over nearly three decades.

Interruption and Legacy: The A11 Motorway and the Twentieth Century

The aqueduct functioned without significant interruption from the moment water reached the city in 1832 until the late 1920s, when Mussolini’s government embarked on the construction of the autostrada network connecting Florence to Pisa and the sea — Italy’s first motorway, the A11. The route selected for this road crossed the Nottolini Aqueduct at its midpoint, presenting engineers with the choice of either routing the motorway around the monument or cutting through it.

The Six Missing Arches

Between 1928 and 1932, the initial phase of the A11 motorway required the removal of one arch from the aqueduct sequence. A new bridge arch of different design was inserted to re-establish the water channel over the motorway gap, and the system continued to function, though the interruption was visually jarring — a single anomalous arch in a sequence of 459 identical ones. In 1962, when the motorway was widened to its current dual-carriageway configuration, the existing partial solution was abandoned and five additional arches were demolished. Since then, a gap of six arch-spans has separated the San Concordio section from the Guamo section, with no physical connection above ground.

The decision not to restore the missing arches after 1962 — technically feasible but politically and financially unattractive — was consistent with the broader postwar attitude toward nineteenth-century infrastructure. By 1962 the aqueduct had already been superseded as a water supply system; a modern underground pipeline following the same route had taken over distribution, and the masonry arcade was already primarily a landscape monument rather than a functioning hydraulic structure. Proposals to restore the six missing arches have surfaced periodically in Lucca’s architectural discourse, most notably in a project published by the architect Pellegrini in 2020, but none has been implemented. The gap remains today as a visible scar in what is otherwise a largely intact monument.

The Modern Underground Successor

The modern water supply system of Lucca follows the same spatial logic as Nottolini’s aqueduct, drawing from the same Monte Pisano spring sources and conveying water along approximately the same route — but entirely underground, in pressurised mains that require no elevated structures and no gravity gradient. The fountains of Lucca’s historic centre are still fed from this system, which draws on the same Vorno and Guamo spring catchments that Nottolini identified as the optimal source two hundred years ago. In this sense the geomorphological intuition embodied in Nottolini’s design has proven permanently correct: the northern slopes of Monte Pisano continue to produce the cold, light, mineral spring water that residents of Lucca and Capannori collect daily from public fountains at the base of the aqueduct arches and at several free-flowing springs in the countryside above Guamo.

The Via degli Acquedotti: A Companion Monument and a Long-Distance Trail

The Nottolini Aqueduct does not stand alone in the territory it occupies. On the opposite, south-facing flank of Monte Pisano, at roughly the same historical moment, a comparable infrastructure project was realised for the city of Pisa: the Medici Aqueduct, also known as the Acquedotto Romano di Caldaccoli or simply the Acquedotto Mediceo. Together, the two aqueducts bracket Monte Pisano from north and south, and a long-distance trail — the Via degli Acquedotti — links them by traversing the massif between Lucca and Pisa.

The Medici Aqueduct of Pisa: A Companion on the Southern Flank

The Medici Aqueduct of Pisa predates the Nottolini by nearly two centuries. Built in the seventeenth century by Grand Duke Ferdinando de’ Medici, it draws spring water from the Valle delle Fonti on the south-facing Pisan flank of Monte Pisano and conveys it 6 kilometres northward to Pisa on 934 equidistant arches of mixed stone and brick construction. Like the Nottolini, it was built on Roman principles and in imitation of Roman aqueducts; like the Nottolini, it is today no longer functional as a water supply but remains architecturally largely intact. The Medici Aqueduct also still supplies spring water to Pisa through a modern parallel system drawing from the same Valle delle Fonti catchment.

The two aqueducts are not equivalent in architectural ambition or visual impact. The Medici is earlier, somewhat cruder in its stonework, and follows a more complex route with greater changes of direction. The Nottolini is later, more refined in its proportions, straighter in its alignment, and more deliberately classical in its architectural language. But they share the same fundamental geomorphological logic — that Monte Pisano’s spring-rich slopes can support gravity-fed water supply to two cities simultaneously, one on each flank of the massif — and this shared logic makes the comparison between them architecturally and historically illuminating.

Walking the Via degli Acquedotti

The Via degli Acquedotti is a waymarked multi-day walking route that connects Lucca to Pisa via the spine of Monte Pisano, passing along sections of both aqueducts and through the spring source zones that feed them. From Lucca, the route follows the Nottolini Aqueduct southward from the Tempietto di San Concordio to the Tempietto di Guamo, then continues uphill along the underground conduits through the Parole d’Oro source zone, climbs to the ridge near Monte Serra, crosses the watershed, and descends through the Valle delle Fonti on the Pisan side before joining the Medici Aqueduct for the final approach to Pisa. The full traverse covers approximately 40 kilometres and is completed in two days, with an overnight stop at Vorno or a ridge shelter.

The trail is maintained jointly by the Club Alpino Italiano sections of Pisa and Lucca and is waymarked on the Rete Escursionistica della Toscana as routes 00, 117, and 124. The Parole d’Oro section, which passes through the spring intake zone of the Nottolini system in the valley of the Rio San Quirico, is managed as a nature park by the Associazione Il Tuffetto, which organises guided visits and educational activities on request. The path along the arcade itself, from Tempietto di San Concordio to Tempietto di Guamo, is flat, unpaved, and accessible by bicycle — a three-kilometre route through open farmland that requires no particular athletic preparation and offers one of the most architecturally immersive walking experiences available in the Tuscany countryside outside of the major historic centres.

Conservation, Scholarship, and the Aqueduct in Architectural History

The Nottolini Aqueduct has attracted sustained scholarly attention since its completion, beginning with the contemporary guides of Trenta and Mazzarosa in the 1820s and 1840s and continuing through a rich twentieth-century bibliography of engineering history, restoration studies, and architectural analysis. Giovanni Pacini’s Storia degli Acquedotti lucchesi of 1834 was the first dedicated monograph, followed by Claudio Salvetti’s comprehensive study of 1987 and Maria Adriana Giusti and Grazia Tucci’s 2005 documentation study presented to the CIPA International Symposium on Heritage Documentation, which produced a full three-dimensional survey of the aqueduct and its territorial context.

The conservation challenge posed by the aqueduct is distinctive. Unlike a building, whose perimeter and volume are defined and manageable, the aqueduct is a linear monument four kilometres long interacting with a dozen land-use regimes — agricultural fields, urban periphery, motorway infrastructure, industrial zones, and managed natural park. The brick and mortar of the arches is subject to differential weathering along the full length; some sections are in excellent condition, others show significant lime leaching, biological colonisation, and efflorescence from groundwater migration through the masonry. No programme of comprehensive restoration has been undertaken; maintenance has been piecemeal and reactive, funded partly by the municipal authorities of Lucca and Capannori and partly by private and associative initiatives.

The question of the six missing arches — whether and how to restore the gap caused by the A11 motorway — is the most discussed conservation issue. The gap is not merely an aesthetic problem; it breaks the intellectual and experiential integrity of the monument at its midpoint, making it impossible to walk the full length of the arcade without crossing the motorway on foot. Various engineering solutions have been proposed: a new bridge of contemporary design that acknowledges the gap rather than disguising it; a reconstruction of the six arches in traditional masonry; a cantilevered pedestrian walkway passing over the motorway at arch height. Each proposal raises different questions about the appropriate relationship between authenticity, legibility, and contemporary intervention in a nineteenth-century monument of this scale and character.

In terms of its position in Italian architectural history, the Nottolini Aqueduct occupies an important but undervalued place. It is the most complete and architecturally ambitious example of Neoclassical hydraulic infrastructure in Italy — more refined than the Medici Aqueduct of Pisa, more intact than the aqueducts of Rome’s suburban Campagna, more explicitly aesthetic in its design intentions than purely utilitarian works of the same period. Its relationship to the Roman aqueduct tradition is at once historically grounded — Nottolini studied Roman aqueducts directly and consciously adopted their techniques — and creatively mediated through the Neo-classical theoretical apparatus of the Accademia di San Luca, producing a monument that is simultaneously an homage, a technical analysis, and an original architectural statement.

Frequently Asked Questions About the Nottolini Aqueduct and the Vorno Springs

What are the exact dimensions of the Nottolini Aqueduct?

The aqueduct extends 3.2 kilometres from the Tempietto di Guamo to the Tempietto di San Concordio. It is supported by 460 pillars carrying 459 semicircular arches, each approximately 6.5 metres in span, at a height of approximately 12 metres above the plain. The dual water channel at the top is covered by stone slabs. Every seventeenth arch is marked by a projecting buttress, numbered with a marble label — 28 buttresses in total along the full arcade length. The channel gradient is minimal, approximately one metre of fall per kilometre, sufficient to maintain gravity-fed flow velocity throughout the system.

How many spring sources supplied the aqueduct?

Approximately 18 documented spring sources on the northern slope of Monte Pisano contributed water to the system. They were grouped into two categories: the purer contact springs issuing directly from the rock aquifer at various points on the Vorno and Guamo slopes, and the surface and stream water of the Rio San Quirico and Rio della Valle collected at the Serra Vespaiata. The pure spring water was directed via a privileged channel to residential and potable-water fountains; the stream water supplied the city’s monumental fountain network. Today, the modern underground system still draws from these same source zones, and twelve of the original eighteen springs are in active use.

What is the Parole d’Oro and why is it significant?

Le Parole d’Oro — the Words of Gold — is the local name for the valley and spring area above Guamo where the Rio San Quirico runs over a flagstone-paved channel built by Nottolini as the surface component of the Serra Vespaiata collection works. The name derives from a commemorative Latin inscription carved in stone on the principal collection bridge, originally set with brass letters that local farmers mistook for gold and stripped. The text records Duke Carlo Lodovico’s commissioning of the water-gathering works. Today the site is managed as a nature park by the Associazione Il Tuffetto, is accessible by waymarked trail from Guamo, and remains the most atmospheric element of the Nottolini hydraulic landscape — a small wooded valley of flagstone channels, brick inspection structures, and chestnut forest whose character has changed little since Nottolini designed it.

Who was Maria Luisa of Bourbon and why did she commission the aqueduct?

Maria Luisa of Bourbon (1782–1824), daughter of the King of Spain, became Duchess of Lucca under the terms of the Congress of Vienna in 1815, which reconstituted several small Italian states on dynastic lines after the Napoleonic period. She was an active patron of architecture and urban improvement, commissioning major works from Nottolini including the piazza regularisations, road improvements, and, most significantly, the aqueduct. Her motivations were a combination of genuine concern for public health — the relationship between contaminated well water and epidemic disease was widely discussed in Enlightenment and post-Enlightenment medical literature — and dynastic prestige. Building a Roman-scale public monument within the first decade of the new duchy’s existence announced the regime’s permanence and ambition. She died in 1824, before the aqueduct was completed, and the project was continued by her son Carlo Lodovico.

What happened to the aqueduct under Fascism?

The A11 motorway, one of Mussolini’s flagship infrastructure projects of the late 1920s, was routed across the Nottolini Aqueduct at its midpoint on the plain between Lucca and Capannori. Between 1928 and 1932, one arch was removed and a substitute bridge structure was inserted to allow the channel to continue functioning over the new road. When the motorway was widened to dual carriageway in 1962, a further five arches were demolished and the water channel was permanently interrupted. Since then the aqueduct has stood in two disconnected halves separated by a gap of six arch spans, with the modern underground pipeline carrying water beneath the motorway on the same route.

What architectural order did Nottolini use for the tempietti?

Both the Tempietto di Guamo and the Tempietto di San Concordio are designed in the Doric order — the most austere of the three classical orders, characterised by columns without bases, plain capitals, and a simple triglyphic frieze. This choice was consistent with Nottolini’s general preference for architectural severity and with the established theoretical association of the Doric order with public, civic, and utilitarian buildings. Both tempietti are circular in plan with domed roofs, following the tradition of Roman circular temples (tholos) such as the Temple of Hercules Victor in Rome, whose formula Nottolini knew from his Roman years. The circular plan also has a functional rationale: a circular cistern distributes hydraulic pressure symmetrically and is structurally more efficient than a rectangular one for containing water under static head.

How does Monte Pisano’s geology explain the quality of the spring water?

Monte Pisano is composed primarily of low-grade metamorphic rocks — phyllite, calcareous schist, and metasandstone — whose interlocking structure creates a natural filtration medium for percolating groundwater. Precipitation falling on the Monte Serra ridge (917 metres) infiltrates through fractured calcareous layers, moving slowly through a matrix of fine-grained metamorphic rock that physically removes suspended particles by mechanical filtration and adsorbs dissolved iron and organic matter onto mineral surfaces. The resulting water is cold (reflecting deep circulation through rock far below surface temperature), mineral-light (the calcareous rocks dissolve slowly, imparting modest calcium and magnesium content without high total dissolved solids), and naturally clarified (turbidity is negligible). Lucca’s municipal tourism authority explicitly attributes the distinctive taste and lightness of Monte Pisano spring water to this geological character — a description that matches the hydrochemistry expected from metamorphic carbonate spring systems worldwide.

Is the Nottolini Aqueduct a UNESCO World Heritage Site?

The Nottolini Aqueduct is not a UNESCO World Heritage Site. It is protected under Italian cultural heritage legislation (the Codice dei Beni Culturali) as a monument of national significance, which regulates alterations, demolition, and land-use changes in its immediate surroundings. It is managed within the Parco Fluviale del Serchio and is accessible free of charge as a walking and cycling route. The aqueduct has been the subject of academic conservation studies but has not been nominated for UNESCO inscription, which would require a formal comparative analysis demonstrating its outstanding universal value against global criteria — an analysis that its scale, integrity, and historical significance could plausibly support, but which has not yet been prepared.

Can visitors walk the full length of the aqueduct today?

The standard walking route from Tempietto di San Concordio to Tempietto di Guamo covers 3.2 kilometres on an unpaved path alongside the arches and takes approximately one hour at a comfortable pace. The terrain is flat and the path is accessible to cyclists, families with young children, and visitors with limited mobility. The gap caused by the A11 motorway divides this route at its midpoint; walkers can approach the motorway gap from either end, but there is no direct crossing along the aqueduct line itself. From the Tempietto di Guamo, an extended route continues uphill via the underground conduit system to the Parole d’Oro spring area, an additional 2.3 kilometres of moderate uphill walking through chestnut woodland, accessible by trail 128 on the CAI (Club Alpino Italiano) network. The full Via degli Acquedotti trail traversing Monte Pisano to Pisa continues from the spring zone over the ridge and down the Pisan flank, a two-day itinerary of approximately 40 kilometres.

What is the relationship between the Nottolini Aqueduct and Piazza dell’Anfiteatro?

Both the Nottolini Aqueduct and Piazza dell’Anfiteatro are works by the same architect — Lorenzo Nottolini — built for the same patrons (the Bourbon Duchy of Lucca) within roughly the same decades. They represent the two poles of Nottolini’s architectural practice: the aqueduct is infrastructure elevated to monumental art in the open landscape, while Piazza dell’Anfiteatro is the regularisation of a surviving Roman urban form within the dense fabric of the medieval city. In both projects Nottolini applied the same governing principles — Neoclassical discipline, structural rigour, sensitivity to the existing historical fabric, and an awareness of the public, civic role of architecture. The two works together constitute Nottolini’s principal legacy in Lucca and the clearest evidence of his ambition to transform the Duchy of Lucca’s built environment in a manner worthy of comparison with the great urban achievements of the Italian peninsula.