In this paper the authors present the results of a re-reading of the works of early Roman writers they had undertaken on the occasion of their study Etruscan cuniculi: tunnels for the collection of pure water presented at the Second Special Session on History of Irrigation held in Fort Collins, U.S.A., 1984.
Attention is turned to the topic of irrigation and drainage in Latium in the last millennium B.C. when the climate, which was rainier than it is today, was gradually becoming less rainy.
The ancient technique of excavating cuniculi for the purpose of collecting water is typical of countries in the Mediterranean Basin and the Middle East. It has been used in the Middle East since the beginning of the 1st millennium B.C. In many countries cuniculi still function today and are maintained.
At the Second Special Session on the History of Irrigation held in 1984 in Fort Collins, U.S.A., the authors of this note presented the results of a study they made on the cuniculi in Latium, central Italy.
There are many functional differences between the cuniculi in Latium and those in arid countries of the Middle and Near East and North Africa.
The cuniculi in many areas of Iran, Iraq, Arabia, Morocco, etc. have been excavated at such a depth (even twenty metres) that the water table bas been intercepted. Such cuniculi, excavated in the bottom of more or less vast valleys, often form well organised systems for collecting water to irrigate oases or settlements (Fig. 1).
By comparison the cuniculi of Latium (Fig. 2) appear to have generally served small independent communities, are limited in their extension and were excavated at a relatively shallow depth (rarely more than five metres). The cuniculi in Latium were not excavated in the bottom of the valley but along the contour line of the hillsides at a slight inclination in order to permit the flow of the water which had infiltrated into the cuniculi. A slight increase in the dryness of the climate (3rd century B.C.) was enough to put them out of order and make continued excavation pointless.
Fig. 1 System of cuniculi (khettara) along the Tafilalet Valley (in Morocco, east of the High Atlas mountains). The water collected is used for irrigating the oasis visible in the background of the photograph.
These cuniculi had been excavated, for the purpose of collecting pure water, by the Etruscans and Latins in the "pozzolana" and "tufo" deposits left by volcanoes, now extinct, which extended north and south of Rome in a direction parallel to the sea.
Fig. 2 Etrusco-latin cuniculus on the side of a hill near the via Torrevecchia on the outskirts of Rome (Italy). The bushes growing around the opening of the shaft are visible. The outlet of this cuniculus is on the left hand side of the photograph in correspondence with a curve in the valley.
These and other considerations on the functions and structural characteristics of cuniculi (made in the first note) led the authors to believe that cuniculi were excavated in Latium between the 8th and 4th century B.C. for collecting drinking water and, only secondarily, for the drainage of limited areas (a documented opinion) and for irrigation of cultivated lands (an undocumented opinion).
The study has, among other things, confuted the opinion of some scholars who interpreted cuniculi as drainage works serving hygienic sanitary purposes excavated in Roman times as a protection against malaria.
The authors, accordingly, proceeded to re-read the works of the early Roman writers paying particular attention to passages in which explicit or implicit reference is made to the topic water and agriculture.
If the cuniculi had been excavated by the Romans, one could expect to find some mention of them in the works of the early Roman writers, in particular the latin georgic ones, for whom the relationship between water and living conditions was a favourite theme both as concerns its sanitary aspects (climate, reclamation, malarious conditions, drinkableness) and agronomic techniques for protection against excesses and deficits of the hydrologic regime (drainage and irrigation).
Just what do these ancient writers say on the matter?
The first Latin author to write about agriculture was M.P. Cato (234 - 149 B.C). In his book Liber de agricultura, a collection of empirical maxims on the life and work of farmers, Cato mentions the need for drainage and describes drainage techniques: open ditches or blind ditches with stones or bundles of bush (Chap. XLIII and CLV).1 He makes no mention of cuniculi or malarious conditions. Although he mentions symptoms of disease (Chap. CLVII), which according to some interpretations could be attributed to malaria, it seems that nothing precise can be deduced. As concerns irrigation, Cato simply mentions vegetable gardens and irrigated pastures (Chap. I and IX).
More than a century later lived M.T. Varro (116-17 B.C.), one of the most erudite men of his times. Little of his work has survived. Only three books of his De re rustica have come down to us. In this work, for the first time in Latin literature a clear indication of the danger of contracting malaria in the Rome area is given (Lib. I, Chap. IV and XII). In it Varro cites Hippocrates who several centuries earlier had dealt with the spread of malaria (see below). On the topic of irrigation and drainage Varro writes briefly of the need to drain excess water (Lib. I, Chap. VI and XXIX), although he makes no mention of cuniculi. He deals more extensively with irrigation, apparently a technique widely practiced at that time (Lib. I, Chap. VII, XXXI, XXXIII, XXXV, XXXVI, XXXVII; Lib. II, Chap. V). Irrigation does not seem to have been an important topic for these authors, although at a later date Varro does deal with the matter more frequently and in more detail than did Cato.
Fig. 4 Drainage tiles found in Alatri (65 km south-east of Rome, Italy). These tiles were laid without being sealed one to another with nortar as generally used in aqueducts (see note in the text).
As concerns this apparent late spread of irrigation practices it would be interesting to clarify to what extent this was due to the climate which was wetter than the present day climate and to the fact that intensive agriculture was practiced later in Latium than in the Middle East where Mesopotamian civilizations had already made great achievements in hydraulic-irrigation technology.
Fig. 5 Tile from a Roman aqueduct found near the locality "Divino Amore" (15 km south of Rome, Italy). Note the remains of mortar used to join these tiles. No mortar was present in the drainage tiles shown in Fig. 4.
...... Did a fever leave you yesterday or the day before?... ...An even more explicit reference to malaria is made by the latin playwright P. Terence Afro (190-150 B.C.) in the conversation between Sostrata and Pamphilus in Hecyra (Act III, ver. 359):
...These lines become clearer if one remembers that there are three types of malaria-bearing parasites and corresponding fevers: the quartan fever with an access every three days, the tertian fever with an access every two days, and the quotidian fever with a daily access. It should be noted that Sostrata's question "Quotidian" (Lat. Cotidiana) is erroneously translated as "continuous" thus depriving the adjective of its meaning of periodicity or intermittence, typical of malarial fevers.
So.: What kind of disease is it?
So.: Quotidian ?
Pan.: So they say.
SECCHI, A., Intorno ad alcune opere idrauliche rinvenute nella campagna di Roma, Atti Accademia Pontificia Nuovi Lincei, Roma, 1876.
JONES, W.H.S., ROSS, R., ELLETT, G.G., Malaria - A neglected factor in the history of Greece and Rome, McMillan and Bowey, London, 1907.
RAVELLI, F., HOWARTH, P.J., Etruscan cuniculi : Tunnels for the collection of pure water International Commission on Irrigation and Drainage, New Delhi, Transactions of XII International Congress on Irrigation and Drainage, Fort Collins - U.S.A., vol. II, 1984.
* ITAL-C.I.D. (Comitato Italiano per l'Irrigazione e la Bonifica Idraulica), c/o Ministero dell'Agricoltura, Via Sallustiana, 00187 Roma, Italia.
1 As concerns tile drainage, two terracotta tiles on display at the exhibition Water and Aqueducts in Rome. 4th century B.C. - 20th century (Acque e acquedotti a Roma. IV sec. a.C. - XX sec.), held in the Museum of Roman Civilization in Rome at the end of 1986, were indicated as being tile drains of the Roman period (Fig. 4). These tiles appear to be the same tiles that Father A. Secchi had found in 1876 near Alatri about 65 km south of Rome (and subsequently displayed in the former Lateran Museum in Rome). In his opinion these were drainage tiles as they fitted into one another, end to end, but had not been sealed.
Although the authors agree that the tiles' function might have been drainage, their very large dimensions suggest that they did not drain cultivated fields, but rather formed an isolated line-drain that could have served to make an excessively damp area practicable or to collect water from an aquifer which probably existed at that time.