The Rabat Qanat
QANAT, SAQQAJJA & ROMAN AQUEDUCT SYSTEM at RABAT, MALTA
Fr. Eugene Paul Teuma O.F.M. Conv.
Water was and always will remain mankind’s most vital element. Man’s advancement from a wandering group of people to a settled farmer community, tribe, people, then civilization depended on the abundant availability of this substance. Until that time that man could bring water to the most arid and inhospitable lands, his progress was hampered. One may dare to travel through such lands, but habitation and control of a region or an immense space of land would only come through engineering means to bring water to these places. Before the time of well digging, damming of watercourses, building of aqueducts, mankind depended completely on natural watercourses and natural oasis for survival. Homesteads, farms, towns and villages developed along these natural courses. Rome itself would not have channelled water until the year 343 B.C.
It would take millennia before civilizations would implement major projects to bring water to create fertile arable land and cities within desert and tundra regions. The deep wells of antiquity (such as Jericho), with stairway running along the vertical shafts, together with deep underground cisterns meant to collect run off water, would prove to be the oldest attempts at building a fortified town at a vital but arid landmark. Still the Qanat water system would prove to be the most important development by far, bring water to far away inhospitable lands and arid deserts.
The placing of altars, shrines, niches and even temples dedicated to particular gods, goddesses or nymphs close to or even surrounding a fountain site go a long way to show with what esteem this life giving substance was revered and fear of its absence appeased.
In Arabic and Spanish the technical term QANAT denotes the water system as a whole, made up of underground or surface channels, and associated shafts. On the other hand the term QATTARA, kattara, or hattara, as used in Spain and North Africa, describes the tunnels (usually 10-12 m. in length) that extends from one shaft to the other. The process by which water is acquired in this system is practically that of “sweating” or oozing out of liquid from the water containing bedrock. Some sites around Malta still bear the toponomy of Qattara, one of these sites is located close to Is-Simblija, limits of Dingli.
Possibly the oldest type of water channelling in the world, originating and evolving in the Middle East during the millennia Before Christ (B.C.), it would be used extensively in the Near East during the 9th and 8th century B.C.. Phoenicians and Greeks spread its use to the Western Mediterranean through settlement and colonization. Etruscans, on the other hand, were making use of similar water systems (cuniculi)in Central Italy by the 5th and 4th Century B.C. The Romans, who inherited most of their water system knowledge from the Etruscans and Greeks, would spread it throughout the Empire with considerable standardization and upgrading from the 2nd Century B.C. onwards. Works like Vitruviusand Frontinuswould then standardize the architectural and engineering elements related to water systems for the coming centuries.
The origin of the Qanat can be related to early attempts at mining during the Bronze and Iron Age. Digging vertical shafts into the ground caused ground water to seep down to the bottom of the shaft and within a few days, or even hours, the shaft would fill with water. These observations would have convinced the diggers/miners that a secondary horizontal tunnel, dug at the outset, would have relieved the mining shafts from water accumulation and the dangerous fumes that tend to form underground. Digging the mine from a horizontal point, with vertical shafts at regular intervals proved to be the most successful scheme.
Water containing layers of rock would be cut through, producing permanent or seasonal springs that would ooze out along the channels. Minors would place their huts or small settlement at the entrance to the mine. Small settlements and arable land developed close to the water source. At the point where the Qanat would come to the surface oasis (or Maltese Ġnien) or fountains (Maltese: Għajn) would evolve.
The largest known Qanat project that is still largely preserved comes from the period of the Persian Empire, at Persepolis. It covers a long distance between the mountains to the plains of Iran and is made up of hundreds of vertical circular shafts. It created the fertile land that would make Persepolis the capital of the Persian Empire, until the destruction of the city by Alexander the Great.
A point to draw regarding to the shafts in the qanat system is that they are not meant to serve as wells, but as ventilation and service access shafts should the need arise to clear cave-ins and the like. The function of the channel is primarily that of carrying the water to the exit or fountain, cutting through the water table, that may be located miles away.
Shafts in Persia and the Middle East are mainly circular, unlike the square or rectangular shafts developed by the Etruscans and the Romans. The Arab Period shafts, dating from the 8th Century A.D., located in North Africa and Spain are also circular, except where re-adaptations of pre-existing water systems are not to be found. It may be deduced that circular shafts are preferred since they are easier and cheaper to dig out. Material extracted in the process is abandoned around the well head. Most sites may still be identified through aerial photography from the rubble mounds collected around the shafts.
Typically the qanat’s horizontal channel/tunnel goes downhill at a very steep gradient, unlike the Roman water system that preserves a shallower and more level gradient. For this reason it suffers less from sinter deposits but may suffer more through due to the fast running water. Water moves down the system by gravity erosion and air pressure derived from the numerous shafts. The shafts in a Qanat are placed around 10 to 12 metres apart.
Digging out the qanat would have demanded that work starts on a horizontal shaft, with one or more vertical shafts being dug contemporarily at regular intervals, as the tunnel progresses. Once the tunnelling was finished, the floor level of the qanat would be modified to give the necessary gradient so as to allow the water to flow smoothly through the whole system.
The term Saqqajja in the Maltese archipelago, SIQAJA, Saquiya, seqqava, sikeja, saqaya, yazaqaya in Spain, or Siqaya or Siqiyat in North Africa have closely related meanings, that may defer according to the century and the regions it is used in. In Spain, during the period of the Caliphs, the term is mostly employed as synonymous to QANAT . A system of underground or surface channels, that at times are related to the purification rites within a Mezquita (or mosque) precinct. Early on Qanat and/or Saqqajja are related to the surface channels that are located within the courtyards of the mosque. This water flow is meant for ritual purifications and cooling of the congregation (Ġemgħa) space.
In North Africa the term SEQIJA eventually came to mean a fountain. This fountain is quite particular for it is the town or village’s East-facing water source, often located next to the main gate or entrance. Even though the term becomes specific, by implication a fountain always has a qanat supplying it with water.
In this context the site of it-Telgħa tas-Saqqajja, at Rabat would qualify both as a fountain; actually it is facing south-southeast, located next to one of the entrances going into the town of Rabat, and also confirms the existence of the Qanat, which is providing it with water.
In Maltese we should also note the use of Tas-SAQWI, relating to a type of agriculture watering practice, making use of open surface channels, and such place names such as SWIEQI.
Roman Aqueduct System
Usually we tend to ascribe the term Roman Aqueduct to those massive arched structures that still extend over deep gorges or valleys throughout Europe, and are the pride of a bygone age. This misconception, based on what we see, is still very common. An in-depth studyhas confirmed that a good percentage of the Roman Aqueduct system tends to be located underground; most of the time hewn into live rock or built up with masonry and pozzolana. A substantial percentage of water from these aqueducts is still supplying the needs of some of the major towns and cities in Italy.
The first experience with aqueducts for the Romans must have been the colossal Etruscan drainage projects. Known as cuniculi, these are dated to the 4th Century B.C., they are found concentrated to the North of Rome itself, especially Veii. The tunnel is usually 1.75m. high and 0.50 m wide. The shafts are located between 33-34m apart, revealing a very high degree of engineering. The vertical shafts are rectangular and average 1.2/1.6m by 0.55/0.75m. The depth of a shaft is usually 6m, but is known to reach 30m.Their gradient varies from 1.2% or 12m/km, to 2.6%, or 26m/km. This is considerably steeper than the gradient within the Roman aqueduct system.
Rather than channelling water to towns and villages, Etruscan cuniculi were used to drain mainly marchlands or lakes, creating arable land in the process. The waters would be diverted into other valleys and natural water systems. The longest know Etruscan Period channel of this type is 4.5km.
The Roman aqueduct system is more complex and multi functional. The system was employed both as drainage systems (to drain lakes or marshland areas), but primarily as collectors of spring and ground water to be conveyed through a complex of channels, tunnels, aqueducts, reservoirs, water towers, from numerous distant regions to established towns, cities, villas and estates. One of the most magnificent and best preserved of these systems is the Aqua Augusta aqueduct system that served, amongst others, the towns of Herculaneum and Pompeii up to 79 A.D. The monumental Piscina Mirabilis reservour, served the Roman fleet stationed at Misenum, to the North of the Bay of Neapolis.
When compared to other water systems the Roman aqueducts may be considerably longer, achieving distances of hundreds of kilometres. The gradient is gentler, and practically level. This helps slow down the wear and tear of the channel base, but encourages the formation of sinter, especially where water contains a particularly high concentration of lime and debris.
The main channel or specus could be 1.65/1.80m. high by 0.70/0.85m wide. The vertical shafts or puteus/putei, spaced out at 20 to 30m., could either be square (1.45m by 1.45m) or rectangular (1.70m by 0.70m). Foot holes hewn into shaft wall allowed access and exit for servicing. These shafts could reach considerable depth, at times deeper than 30 or 40 m.
Engineers making use of different implements, including a groma, would have initiated the project with a thorough survey of the area. A T-board (chorobates) would then give out the exact levels on a steep gradient. Shafts would be measured out and digging would begin simultaneously on as many shafts as possible. A type of measure (possibly made of rope/hemp) would guarantee that all shafts reached the desired depth. Horizontal tunnels would then be hewn out simultaneously. The greater distance of the shafts, than those to be found on a qanat site, would show that there was a greater degree of certainty through standardized engineering.
Converging traces of picks or other implements confirm this hypothesis. In a number of cases the rock still preserves traces of mistakes, abortions and corrections during the same work. The sound of the picks and listening to the voices of co-workers were the only means of orientation in these narrow and low tunnels systems. The tunnels averaged 1.70 m. in height and 0.60m. in width.
Roman aqueducts are not only related to channelling of water through galleries but also to a whole process that would pass from the settling tanks, reservoirs and the castellum at the town’s entrance. The castellum divided the flow through three separate reservoirs that would serve respectively public fountains, bathhouses, and private property. We need not go into great detail here, our main interest remains the underground channels and tunnels that helped in the collection and distribution of water.
This system had one major flaw: water would reach the town, city or fortified perimeter so long as the aqueducts functioned properly, and were not impeded in any way by natural catastrophe or tampered with by human intervention. Within hours or days of a mayor disaster the water flow would stop completely. For this eventuality the Romans would have made sure to stock enough water within large reservoirs and connected well systems. These would normally serve the military rather than the civil needs. Water to bath complexes, private homes and estates, controlled from the castellum, would be shuttered down, leaving only the necessary water being pumped to public fountains. Unfortunately these would dry up as soon as the supplying reservoirs ran out of water. The military would have access to a permanent supply of water through deeply dug, and connected wells.
Running under Rabat at a depth varying between 3m to 12 m, due to the steep natural gradient of the hillside going to Rabat Centre towards Għeriexem, this system is made up of numerous (16 or more) rectangular shafts (1.77m. by 0.86m) (putei) distanced at some 18m/25m. from each other. The tunnel (or specus) averages 1.65/1.70m. in height by 0.75/0.80 m. width. The gradient is very light.
The main sections investigated and plotted are two. One section, measuring c.500m, is accessible from a site immediately next to St. Paul’s Church, from within an ancient cistern turned into a charnel house, next to St. Mary Magdalene Chapel.
This system had at some time or another, been modified and redirected to the Għeriexem fountain. The perennial spring within this tunnel moves in the general direction of North West, and runs parallel to the Roman Ditch; preserved under the Santa Rita Road, at a constant distance of 26m.
The other part of tunnel investigated is situated under Santu Spirtu Hospital (now The National Archives); this has been investigated up to c.60m. The general direction of this tunnel is moving towards the North East. This site has been much ruined through the hewing of a Second World War shelter and underground hospital. Still discernable elements of the original water system are present in the blocked up wells that are regularly spaced out (c. 9/12m. apart) within the confines of the main hospital hall. Presently the site is inaccessible due to drainage infiltrations.
The channel next to St. Paul’s Church is linked directly to the Santu Spirtu Hospital site. The tunnels and shafts enclose a large rectangular area that corresponds to the fortified perimeter of the old Roman Melita. It has been discovered that the rectangular shafts run parallel to the Roman Ditch that still exists between St. Paul’s Parish Church and the former Teuma-Castelletti residence. The preserved Roman Ditch section behind St. Paul’s Church measures 30 metres in width by 2 metres in height.
The distance of 15.45m. has been measured for one set of the wellheads, from the ditch’s edge. These are located next to St. Mary Magdalene underground Chapel. Moreover surviving traces of fortifications from the Roman period have been measured at 41m. from the ditch’s edge. The thickness of the surviving fortification elements measure between 4.7m up to 5.10m and are embedded within the precinct of St. Francis Friary, at ta’ Segiu. The same distance of 41m has been measured between the octagonal base of the monument dedicated to St. Paul the Apostle, and the ditch’s edge (against St. Paul’s Church wall). The monument, built up of reused stones that still preserved vivid red and green stucco colouring, has unfortunately been redecorated recently. These archaeological vestiges have been destroyed.
The monument site would correspond to one of the gatehouse towers at the main city gate, already mentioned in this area by both Abela (1647) and by Ciantar (1740). The particular octagonal tower feature corresponds to 3rd up to 9th Century fortification building techniques. Two very detailed and informative sketches by Schellinks, drawn in 1664, portray the immediate area next to St. Paul’s Church. They depict a huge rubble mound (a tell), with a “sacred well”, and entrances to underground features located close by. The ground is strewn with rubble and antique relics, including architectural features of clear Roman provenience, showing that the area immediately next to the ditch was uncultivated and uninhabited during the 17th Century.
Tradition wise the mound is interpreted as the location from were St. Paul the Apostle preached and converted the islanders, the “sacred well” was believed to have been used for baptizing the converts. Abela also recognizes the area as being next to the Forum.
Interpreting the sketches we find that the monument now occupies the mound site, while the “sacred well” must be related to the water system under investigation. The underground entrance, with the cross and inscribed slab on top must be the opening leading to St. Mary Magdalene’s Chapel.
Surviving underground elements in the immediate area of St. Paul’s Church most probably date from the late Roman or Byzantine Periods. One of these is the so-called Chapel of St. Mary Magdalena, a deep and originally circular bell shaped feature with a large central opening in the ceiling, now occupied by a small lantern. The site was used as a charnel house up to 1634, when it was cleaned up and turned into a chapel. The elaborate workings of this feature would prove, under closer observation, to be something other than a water cistern. It may be a ROBUR, or immense grain silo located at the entrance to the city.
The less worthy function that a Robur served for was that of doubling up as a prison and a place where death sentences were enacted. Prisoners would be thrown into the deep silo and left to die. It could be that the poisonous fumes emitted by the stored grain also played a part in their death. The closeness of the site to St. Paul’s grotto, the traditional location of St. Paul’s confinement during his three-month sojourn in Malta is remarkable. This ROBUR most probably is related to the massive fortification project that took place at Melita during the 4th or 5th Century A.D., when a considerable perimeter of the original Roman town was separated by a wide ditch (30 meters wide), and the building of massive walls (5.10 meters thick) and tower fortifications. This compares to what was happening throughout the Roman Empire during the 4th and 5th Century, when practically all towns and cities, including Rome itself, were provided with defences, in most cases reducig by half the perimeter of the original town.
Contemporary to the Robur, and located close by, one finds two large rock-hewn chambers, measuring 11.20m by 5.76m. and 11.73 m. by 4.63m. respectively. For hundreds of years they were used as charnel houses, as the massive collection of bones and other artefacts collected within would show, but their “construction” design would indicate possibly Roman cisterns. They are hewn out of the live rock, leaving a thick layer of rock cover (1.5/1.8m.) to serve as ceiling. These are the last vestiges of a magnificent rock hewn reservoir complex that existed in the space left in between the city walls and the ditch. This is also typically Roman engineering; cisterns and wells were property of the state and were thus controlled by the state. A similar type of distribution may be observed in Byzantine Period Constantinople .
These cisterns were turned into charnel houses and chapels during the medieval period. Twenty-one (21) such features are recorded. Practically all access to these underground features, with the exception of the three mentioned, were filled in and buried when the new road (Santa Rita) was built within the original Roman ditch in the 1960s.
The Roman town ditch, is still traceable starting from the former Theuma Castelletti residence, on Saqqajja street, through St. Paul’s Church (built within it) to Ta’ Qasha Chapel, on Santa Rita street. The ditch turns at right angles through it-Torri l-Aħmar street, where a Medieval tower, known as It-Torri l-Aħmar, with possible Punic/Roman integrations at the base, was illegally demolished to make way for a supermarket. Originally the tower “belonged” to the Golcher family. Surviving elements of the Roman wall can be seen going down from Saqqajja in the direction of Valletta. A new iron gate encloses this still undeveloped “private” property, while another surviving section within a public path has been closed off and turned into a private path.
A rock-hewn stairway, to one side of the charnel house, leads deep into the ground creating a link between the cistern and the deep tunnels. This is one of the access points at present. Tunnelling during the Second World War to create deep air raid shelters has linked these two cisterns to the deeper water channel and aqueduct.
The tunnel is quite narrow and shallow (1.65m. by 0.70m.) demanding one to crouch to be able to walk through. A perennial stream runs through within a central stone water channel, possibly a modification made during the knights’ Period. The water that seeps from the rock face moves towards Għeriexem fountain.
A very particular and informative set of features encountered within the tunnels, at the point where they come to a well shaft are circular tunnels running from behind the area of the shaft. Though baffling during earlier visits, these unwarranted and unnecessary channels were to prove an important element in interpreting and dating the water system.
The late Fr. Pacifico Zammit of the Franciscan grey friars told me of a 17th Century manuscript (or Cronaca) that made mention of the two wells located within the friary cloister, and front garden (overlooking ta’ Saura hospice). Despite the fact that only one of the two wells had channelling to receive rainwater; both wells were filled to the same level. This made it abundantly clear that both wells were joined together by a channel (or spiera).
Yet another friar, Fr. Sebastian Scicluna, told how one day, soon after the beginning of WWII, he was startled to hear voices coming up from the cloister well. It resulted that workers from Santu Spiritu Hospital were digging out a large shelter following the channels of the old water system. The Santu Spiritu underground shelter still preserves clear traces of the original channel. In the meantime both wells located within the friary perimeter, still continue to fill up with water, meaning that the tunnels being dug into were not the lower tunnels, but some type of service channel, located half way up the wells.
The conclusion drawn was that there are two levels of channels connected to each shaft. The surviving level is the “service” channel, located much deeper there must have been another channel serving as water catchment and well. The only known functioning well shafts are the two well that pass through the Conventual Friary.
This service channel is today serving as main water channel for fountains located around Rabat: Ta’ Ħammiem (Turkish Baths), ta’ Għeriexem (numerous huts), tas-Saqqajja (East facing fountain). This would mean that the deeper wells were filled in to create this qanat type of water system. The clearly Arab toponomy of the fountains mentioned would mean that the modification took place some time during the Arab Period (890 – 1130). The original rectangular shafts, that are typically Punic or Roman, are surviving vestiges of an older type of water system within a Qanat type of water system.
Their orientation, which runs parallel to the original Roman ditch and fortifications, the rectangular putei, and the fact that they are straight and go round on all sides of a fortified city that no longer existed during the Arab rule would seem to imply a Roman or Byzantine origin.
Moreover rectangular putei, that correspond to the same measurements as the ones we find here, have been discovered within Roman archaeological context around the island; one example was located by the Italian Archaeological Mission in the 1960s within the Roman villa site of San Pawl Milqi, at Burmarrad, while another one was located during the excavations at Howard Gardens conducted by a team of American archaeologists in 1983.
The Burmarrad site puteus is still well preserved and “in locu”, within the context of a building. Three large well fitted but removable blocks of rectangular ashlar stones cover the shaft, located in the floor to one side of a room or chamber. One of the rectangular stones has a circular wellhead cut into it. This wellhead is much eroded by ropes used to bring up the water from the 3m. deep well. Toe holes in the wall of the rectangular shaft would show that accessibility was possible, even though the stones are heavy, and well fitted.
The Howard Garden site shaft , measuring 1.m. x m., discovered by the latter is an exact replica, though much damaged of the aqueduct system documented by myself. The conclusion drawn that this shaft and two blocked channels at the base were ancient tombs is a completely misinterpretation of the evidence.
A question that arises is why are these wells located in open ground some 21m in front of the main fortifications. The solution will only be solved through proper excavations, but it may be that originally these “wells” were within tower structures placed half way between the ditch and the main defences. This is highly probable, since the defences of a number of towns and cities, including Byzantium itself, during the Byzantine Period did possess two or three lines of defences. The presence of abundant and endless reserves of water, would also explain why the Greek garrison took such a long time to surrender in 870 A.D. It could also explain how the garrison took control of the city when the Arab troops were in control of the walls and the towers, using the service tunnel and shafts to gain access into the locked and impregnable towers and overcoming the guards.
Filling in the wells with stone and material would not have sufficed, seeing the immenseness of this colossal project, so after filling in some of the deeper wells with debris, the project was abandoned. Most of the wellheads were caped by immense blocks of ashlars, as can still be seen within the Santu Spiritu complex. Others were blocked by rubble and pozzolana walls, at the service channel level
The victorious Caliph’s ultimate decision to destroy and demolish all the city of Melita and its fortifications, with a number of the shafts being blocked by large ashlars blocks, helped turn these channels into underground springs that would be eventually turned into fountains by the Arab settlers in 1054 A.D. The rest of the apertures at the tunnel level were blocked with rubble walls and pozzolana, so as to permit the water going round and not down into the deeper wells; these would become bones of contention between private individuals, who regularly broke the seals to allow water from the system to pass into their wells and the local authorities, be it the Università or the Order of Knights of St. John.
The oldest mention of the fountains at tas-Saqajja and l-Għeriexem come from 15th and 16th Century Università Council records. Mention is made of the fountains and water systems that provided water to the public fountains. Specific mention is made of the abuses related to siphoning off of public water and the pollution of the same the water system through dumping of rubish and carcasses.
The fountains mentioned are Għeriexem and Saqqajja, already imply/indicate an Arab origin for the term.. Many locals today still think that ta’ Ħammiem Fountain means Fountain of the Pigeons, while actually its Arabic origin would indicate the site of a Turkish Baths (Ħammam) (possibly preserving the memory of a Roman Bath Complex). Tas-Saqqajja’s meaning, that of a Southeast-facing fountain, in old Arabic (North African) tradition, is also lost to the local population.
The importance of these public fountains is further emphasized by reports dating from the knight’s period. Systematic if irregular reports relating to the condition and abuses encountered on site are to be found at The National Archives. Since I had presented my papernew documentary evidence has turned up. The file includes correspondence, appeals, and reports relating to the precarious conditions, the malfunctions and abuses relating to the fountains at Għeriexem and Saqqajja. These reports date from 1625, 1695 and 1718 respectively. One of the detailed reports, autographed by Blondel contains a very detailed map/plan of the water system under discussion, drawn by M. Blondelhimself.
Together with the detailed report plan, Blondel’s sketch is the most interesting element since it shows in detail the channel, the circular features (spieri), and the blocked well shafts, encountered during our own 1995-7 investigations. Blondel observes that intentional openings in the rubble and “pozzolana” walls, blocking the shafts, were causing most of the water to be siphoned away from the public fountains into private wells and cisterns. These (his report implies) were watering the “large” gardens located within the Roman ditch. An important element revealed by the sketch is that the channel leading to the Saqqajja Fountain takes a 90 degree turn to link to the fountain. As in the case of Għeriexem, this would imply that the original channels were not meant to access these fountains, and that the radical modifications had to be made to link the fountains to their water source. This also implies that the channels were not originally intended to provide water to the fountains, but must have made part of an older water system. The most promising period for these modifications and the building of the fountains would be during the Arab period. All place names have original Arabic terms.
As always another invaluable if little appreciated source for information would be Fra Gio. Francesco Abela. In his Della Descrizione di Malta Isola nel Mare Siciliano con le sue Antichità ed Altre Notizie. Libri Quattro , printed in 1647, he had already said it all:
“…Si conservano gl’Aquidotti fatti con grand’ ingegno per condurre sotterra l’acqua alla medesima, come si vede in effetto, ch’ella (Rabat) sovrabbonda, vaghegiandousi delitiose fontane, che a gran douitia per ogni lato l’arrichiscono, e abbelliscono insieme. Oltre molti pozzi d’acqua viva, de quali anche si servono i cittadini…”
In other words Abela is convinced that the channels feeding the public fountains at Għeriexem (ghar Yescem) and Saqqajja were “ancient”.
When he speaks about Ħammiem he tells us even more:
“…come anche si mira un pozzo d’acqua viva, ch’è la stessa che va a sgorgare lungi un tiro di pietra sotto le mura della Citta’ nel luogo chiamato Aayn Hammyem, che vuol dire fonte de’bagni, la quale hoggi serve di publico lavatoio; l’acqua è alquanto calda, anzi piu’ tosto salmastra, che dolce…”
He also speaks of certain discoveries, in the vicinities, related to an ancient aqueduct systemand the discovery of a Roman baths complex, possibly located close to Għajn Ħammiem.
To give a date to the origin of this water system we must have some comparisons. What make this site important are the rectangular shafts (or putei) and the circular tunnels going round most of the well shafts. If we try to find comparisons for the putei we find that Roman Villa at San Pawl Milqi, Burmarrad has an identical wellhead. This shaft measures 1.70 x 0.65m and is covered by three large and thick slabs. One of them has a perforation so as to collect water. The large slabs are movable, as the rock hewn steps in the shaft wall would indicate. The depth of the shaft on the Burmarrad site is a mere three meters, and the cistern was heavily modified at a later period, when a field was located on top of the archaeological area. Similar slabs were observed blocking the shafts at the Rabat site.
Another important site that merits comparison are the excavations on Museum Esplanade, where a group of American archaeologists, has excavated the remains of Roman Melita . Their investigation had concluded that the town house investigated had come to a sudden and catastrophic end, with the walls being toppled over. The location was never inhabited again and fields replaced the site during the Medieval Period.
The discovery of a deep shaft, corresponding to ones investigated within the precinct wall, with the three large slabs in place, made them draw an unfortunate conclusion. They thought that this was a shaft leading down to a set of tombs. They believed that it was only during the Medieval period that this shaft was being used as a well. Unfortunately they did not remove the rubble walls within the shaft, this would have led them into a now defunct section of the water system investigated before. The measurements correspond in every way: the shaft is 1.60m x 0.65m.
This would show that at least the shafts date from the Roman Period. The other element is even more compelling. The circular tunnel that goes round behind the wellheads. There present collocation within the waterway renders them quite useless, so why would someone expend such immense time and resources to create such elaborately worked collection of identical tunnels, located on a strait and level stretch of tunnelling?
The system with its two tier level was probably created sometime between the 3rd and 5th Century A.D., when, as was happening throughout the Western and Eastern Roman Empire, towns and cities were being reduced to half or a third of their size to permit the building of fortifications, and the creation of wide ditches. Most of the material was recuperated from the demolished buildings, remaining outside this protective area. In this context, it may be surmised that the Roman Town house, on Museum Esplanade could have been demolished and buried during such a project. One of the shafts is located squarely inside the house perimeter.
The tunnels and wells (putei), examined were meant to supply a number of towers on a curtain wall located some 26m. from the ditch’s edge. Another set of towers, of which the vestiges are preserved in the octagonal monument base and St. Francis Friary perimeter wall, are set at 41m. from the ditch. The preserved wall section is circa 5.10m. at the base, and is preserve to a height of some 6 metres. Another fortified perimeter, of which traces still exist behind St. Paul’s Church, is located within the ditch itself. Open turrets for one or two soldiers made up this first line, eventually these were modified and enlarged into proper towers by the 6th or 9th Century A.D. Unfortunately recent structural repair work on the “tower” structure, has covered and hidden from view these important traces. It must be noted that similar distribution of fortifications can be observed in numerous town and city plans from the Byzantine Period. The city of Byzantium was fortified in the same manner.
The service tunnels were accessible from every single shaft, as foot or toeholds may show. The wells are caped by three large ashlar blocks, measuring 0.86m. x 0.60 x0.35. One of the blocks usually has a circular hole at the centre. Wear through use of ropes is evident. A number of shafts are blocked by barrel vault ceilings without any wellhead, and seem to have been blocked intentionally in antiquity. One shaft at Santu Spirtu has three massive blocks closing it. The service channel here is a mere 2.75m. below the rock level.
There are sixteen shafts connected to each other between Ta’ Cascha Chapel to St. Paul’s Church. A similar number must be located in the stretch between St. Paul’s Church and the Theuma Castelletti residence. The shafts measure 1.70m. x0.60m. and average between 3.m and 12m. in depth, the deepest well being encountered near St. Paul’s Church. They are distanced some 13m to 24.2m. apart with two sets of wells being distanced respectively 45.54m. and 42.45m. The first reading corresponds to the site immediately in front of St. Paul’ Church, the other is located 38.75m. to the North, in line with St Catald Chapel. These two readings could in practice indicate the town’s main gates, as already described by Abela in 1647. Another gatehouse, possibly a Postern, is embedded within the perimeter wall of St. Francis Friary. Three immense waterspouts (mwieżeb) typical of Byzantine construction are embedded in the debris.
The second site examined, running from St. Francis Friary to Santo Spirtu, measures 52.92m. This is only a small part of the whole tunnel system, but a good part seems to be blocked. Eleven shafts are traceable in this heavily modified area. They are spaced out between 8.17m. and 9.78m apart. The closeness of the wells could indicate that the “towers” within the fortified area were sited closer together. Consistent traces of another fortified wall may be seen within the Punic excavations next to Santu Spirtu Archives. This Isodomum opus type of wall construction is cutting through, at right angles, the older Phoenician/Punic casement wall. It must have formed the base for an outer fortified wall, located some 23m. in front of the second line of fortifications and the wellheads.
The water system must have been in use up to the very end of the Byzantine Period, until after a long and destructive siege the whole city of Melita was demolished by the Arab conquerors. Most of the shafts were blocked and the channels were filled in with debris. At some time during the Arab Period the “service” channel was restored to serve a at least three fountains: Ħammiem, Għeriexem, and Saqqajja. The major modification being the sealing up of the end of the tunnels leading to the wells, and making use of the circular channel going behind the shaft area. This aspect would prove to be the most controversial part of the project, for all future trouble with siphoning off of public water and other abuses would derive from these shafts. We know that the Università and the Knights took care to curb abuses, cleaning and restoring these channels and public fountains.
The system continued in use during the British Period, when the introduction of water mains and other services made the public fountains eventually redundant. Saqqajja Fountain was already dry by the latter part of the 19th Century, while drainage tainted water from Għeriexem and Għajn Ħammiem is today mainly employed for agricultural purposes.
During this research, which has taken the best of ten years, many persons helped out with the actual exploration of the water system and the planning of the site. I am indebted to Mr. Joe Dalli and Ms. Rachael Bugeja for accompanying me on a number of “field trips” into these dark, humid and narrow confines of the Għeriexem track. Mr. & Ms. Mario and Sylvia Galea for accompanying me through the Santu Spiritu / Saqqajja section, the late Fr. Pacifico Zammit O.F.M. Conv., Fr. Sebastian (Bastjan) Scicluna O.F.M. Conv. Can. Joe Azzopardi, Rev. Fsadni presently Curator of Wignacourt Museum, Rabat, successive Parish priests of St. Paul’s Church, who encouraged me with information regarding the area,
Ms Elaine Saliba (nee Micallef Valenzia) who lent me her dissertation and indicated to me the invaluable 16th and 17th Century manuscripts and related material at the National Archives. The late Tancred Gouder, and Anthony Pace for allowing me to view the ACLA report at The Archaeology Library.
Last but not least I would like to thank past and present Committee members of the Malta Historical Society for their support and invaluable help.
 Sesto Giulio Frontino, Gli Aquedotti di Roma: testo Latino a fronte, Lecce 1997. 25 (De aquaeductu urbis Romae, I, 4 (98 A.D.)
 H. Yohanan, The Archaeology of the Land of Israel, SCM Press, London 1982. 23-34
 Filippo Corelli, Roma (Guide Archeologiche) 2002, 36-41.
 B. P. Maldonado, Tratado de Arquitectura Hispanomusulmana. I, Aqua (aljibes – puentes – qanats – acueductos – jardines – desagues de ciudades y fortalezas – ruedas hidraulicas – banos – corachas) Madrid 1990. 185-187
 A. T. Hodge, Roman Aqueducts & Water Supply, Duckworth, Liverpool 2002. 20-24
 A. T. Hodge, 2002. 45-47
 S. G. Frontino, 1997. 25 “…per quattrocentoquarantuno anni dalla fondazione della loro citta, i Romani si contentarono dell’ acqua che attingevano dal Tevere, dai pozzi o dalle fonti. Il ricordo di queste ultime e’ ancora vivo e si conserva con venerazione…. (De aqueductu urbis Romae, I, 4)
 Vitruvius, The Ten Books on Architecture, trans Morris Hicky Morgan (1914), Dover Publications Inc., New York 1960
 S. G. Frontinius, De aqueductu urbis Romae
 Vitruvius, 1960, 245(Vit. VI, 12-13)
 A. T. Hodge, 2002. 20ff
 B. P. Maldonado, 1990. 187-189
 ibid. 1990. 185-248
 ibid. 188. “el problema lexicografico de las voces Qanat y Siqaya en la edad Media”
 G. Bodon – I. Riera – P. Zanovallo, Utilitas Necessaria: Sistemi idraulici nell’ Italia romana, a cura di I. Rieri, Milano 1994.
 A. T. Hodge, 2002. 24
 A. T. Hodge, 2002. 45-47
 Sinter is practically lime scale forming along the tunnel walls. Comparable to fat build up blocking arteries, this lime scale eventually clogged and obstructed a good number of the water systems. Sinter is quarried in certain parts of Northern Europe, most of the time recovered from deposits within Roman tunnel systems.
A. T. Hodge, 2002, 208-210.
 Measurements of water system from Torri l-Ahmar street to St. Paul’s Church: measurements taken in September 1995. (abbreviations: circ. = circumference; w. = width; h. = height; ws. = water source – 2.2 – [5.6] – 33.30 – [1.1 x 0.65w.] – 26.00 – [2.3] – 14.30 – [0.50 + 1.85+ 0.65] – 14.72 – [2.8 x 6.00 h.} – 12.18 – [5.5 circ.] – 2.3 + 1.2 + 14.65 – [6.14 circ.] – 14.40 – 14.72 – [2.8 x 6.00 h.] – 12.18 – [5.5 circ.] – 2.3 + 1.2 + 14.65 – [6.14 circ.] – 14.40 – [4.4 circ.] – 14.80 – [?] – ? – [0.78 + 1.68 + 0.78 X 10.00 h.} – 14.85 + 3.3 + 3.5 – [1.88] – 42.55 (gate?) – [0.65 + 1.75 + 0.65} – 14.00 – [0.86 + 1.88 + 0.86] – 14.20 – [0.85 + 2.6 + 0.85] – 18.10 x 0.70 w. – [1.65] – 24.25 – [4.8 circ. x 12 h. (ws.)] – 42.40 (gate?) x 0.70 w. – [blocked arch way]
 Measurements of water system from St Francis Friary to Saqqajja Square: measurements taken September 1995
– 10.50 – [6.4] – 20.50 – [4.05] – 10.50 – [4.4] – 10.65 – [4.5] – 11.2 – [?] – 11.60 – [4.4] – 9.95 – [?] – (?) – [?]
 During the earlier part of 1990s, a number of individuals walked down the tunnels from Santu Spirtu exiting next to St. Paul’s statue. They came up through Santa Maria Magdalene Chapel, next to the large statue of St. Paul. They confirm encountering a deep well at some point of their walk.
 In both works there is mention of the Roman perimeter wall and ditch at Rabat. Abela states that there were two main gates, one located next to St. Catald Chapel, the other in line with St. Francis Friary. In his map of Melita Abela places the main gates near St. Catald Chapel and St. Paul’s Church. Ciantar says there were four, one in line with Ta’ Qasha Chapel, the others in line with St. Catald, another in line with St. Paul’s Church, and the fourth through St. Francis Friary. Abela and Ciantar mentions cart ruts on the rocky surface next to St. Catald. When examining the tunnels two sites, corresponding to Abela’s map premise was discovered, the well shafts were dug closer together, circa 9m. apart rather than 18m. On the other hand a postern gate is still embedded within the walls of St. Francis Friary, where Ciantar states he saw cart rut features going into the wall.
 T. Freller, St. Paul’s Grotto and its Visitors: Pilgrims, Knights, Scholars and Sceptics, Valletta 1995. 128-129
 J. Tonna, Centre and Axis: symbolic meaning in the precincts of the Parish Church of St. Paul, Rabat, in St. Paul’s Grotto, Church and Museum, ed. By Canon John Azzopardi, Malta 1990. 80-84
 G. Azzopardi, Iz-Zuntier jew Ċimiterju ta’ San Pawl fir-Rabat, in Il-Festa Tagħna, Malta 1984. 19-23
 F. Coarelli, 2002, 20-35 / Richard Krautheimr, Rome, Profile of a City, 312-1308, 1980.
 Richard Krautheimer, Early Christian and Byzantine Architecture, 1986. 69-73
 G. Azzopardi, 1983, 19-23
 Lyn Rodley, Byzantine art and architecture, an introduction, 1994, 16-26
 Joseph M. Brincat, 670-1054, Al-Himyari’s Accounr and its Linguistic Implications, Malta 1995.
 UNIV 187, 2r-12r
 Anthony T. Luttrell, Approaches to Medieval Malta, in Medieval Malta, ed. Anthony T. Lutrell, London 1975. 56
 Proceedings of History Week, held at the Ministry of Foreign Affairs, Merchants Street, Valletta, On Saturday 29th November 2003.
 UNIV 187, 11v-12r
 Elaine Micallef Valenzia, The Military and Civil Architecture of Baroque Malta and the Chevalier de Malte Mederico de Blondel des Croisettes (dissertation), (September) 1999. 121-126
 Gio. Francesco Abela, Della Descrizione di Malta del Commentator Abela, Malta 1647. 31 (Abela, I,II)
 ibid. 33 (Abela I,III)
 ibid. 109-117 (Abela I,IX, delle acque della fontana e della condotta loro all Citta Valletta)
 ibid. 33-36 (Abela I, III, discorso de’ bagni, o stufe) “…non mancano fin’hoggi gli edifici de’bagni, che usavano i nostri Antenati: atteso che vediamo nel giardino, fu già del Canonico Don Tomaso Zabar nel Rabato rimasto un Damuso, o sia volta a’testugine di pietre rustiche sotterra appoggiata sopra grosse anticaglie concatenate di pietra detta da nostri giogiolena con calce, e rena. Nel medesimo luogo si son trovati canali di piombo, per dove scorreva l’acqua nelle vasche, ove si lavavano, & alcuni frammenti di pavimento intersiati con pezzi di marmo di diversi colori, de’quali alcuni tutta via diligentemente presso di noi si conservano…”
 Missiona Archeological Italiana, campagna di scavi 1963, Roma 1964, 119-144.
Missione Archeologica Italiana, campagna di scavi 1964, Roma 1965.
Missione Archeologica Italiana, campagna di scavi 1965, Roma 1966, 83-124.
Missione Archeological Italiana, campagna di scavi 1966, Roma 1967.
Missiont Archeological Italiana, campagna di scavi, Roma 1967.
Missione Archeological Italiana, campagna di scavi 1967, Roma 1968
Missione Archeological Italiana, campagna di scavi 1968, Roma 1969, 93-108.
 UCLA Excavation Report (Museum Esplanade, Rabat, Malta), 1983. (DAG 16-10 – Box No. 6i – Ts (123)
 UCLA Excavation Report
 Cyril Mango, Architettura Bizantina, Milano 1989, 18-32.
 Dictionary of Art and Archaeology, J.W. Mollett, London 1994. Isodomum or Isodomos: (equal courses) typically Greek or Roman construction technique where the surface of each stone is of one uniform size, and the joints of one layer are adjusted with those of another so as to correspond symmetrically.
 Joseph M. Brincat, 1995, 16-17.