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Waterhistory.orgJordanian Qanat Romani
Dale R. Lightfoot
On the east side of the Jordan Valley during the Roman and Byzantine periods, dynamic populations pushed outinto marginal lands where no permanent, sedentary civilizations preceded or followed them, doubling the pop-ulation of many sites in the area compared to the pre-Roman era.1 In this marginal, summer-dry Mediterraneanland, the concern for water supply is pervasive, especially in the steppe or desert land of the Levant, where thepresence and possession of water were decisive for life and death.2 During the Roman-Byzantine period, as atpresent, the development of surface water resources was primarily emphasized,3 but an attempt also was madeto develop groundwater resources by constructing wells, spring tunnels, and qanats.
Qanats were recently studied in Jordan and Syria as part of a broader project examining the role of qanats in amodern world. This article reports on the Jordanian portion of this research. Fieldwork was conducted in orderto (1) produce a regional map of Jordan's qanats; (2) examine the relationship among qanat sites, ancient settle-ments, and physiographic zones; and (3) determine the status of qanats at each site, toward an understanding ofthe pattern of qanat abandonment and reuse.
Ten sites, with thirty-two separate qanat galleries, have been identified in Jordan. Only five of these Jordaniansites had been previously recovered; five new sites were discovered through this research. During the course offieldwork, I followed many additional leads provided by articles, books, maps, resource officials, village mukhtars(advisers), and felaheen (peasant/farmer) union members. Many dozens of towns, villages, and remote field loca-tions were checked during this process, especially within regions where qanats were already known to exist andin physiographic zones best suited to qanat use, including the Mafraq-Jebel Druze area, the Irbid-Yarmouk area,the Jordan Valley (El Ghor), the Arava Valley, and the Ma'an-Karak area. In most cases, suspected qanats turnedout to be short, rock-cut spring tunnels (which renew or increase natural spring discharge) or slab-covered sur-face canals. Both resemble qanats in form and function but are usually much shorter and are far more commonthan true qanats.4 Jordanian Qanat Romani Figure 1. Qanat sites in Jordan (from original fieldwork data).
History of Jordan's Qanats
The precise dating of qanats is virtually impossible, unless their construction was accompanied by documenta-tion or dated inscriptions. Most of the evidence we have for the age of qanats in any region is circumstantial, aresult of their association with the ceramics or ruins of ancient sites whose chronologies have been establishedthrough archaeological investigation; or the qanat technology being introduced long ago by peoples whose pat-tern of diffusion can be mapped and dated; or a local oral tradition establishing qanats as pre- or postdatingother events whose dates have been more firmly established.5 Jordanians today (at least those few who are aware that qanats exist) refer to qanats as "Roman canals", or qanatRomani (kaneh Romani in northern Jordan, sarab ["underground canal"] in southern Jordan). However, the termRomani is commonly applied to ancient features in this region, and it also can be interpreted to mean "pre-Islamic"or simply "old" and not necessarily "Roman".
With few exceptions historic irrigation systems in Jordan seem to date mainly from Roman times. The Romans(64 B.C. to A.D. 330)6 and their eastern Roman empire successors the Byzantines (A.D. 330-630) gave to Jordan(and Syria) a great number of aqueducts and wells; they improved irrigation techniques in the region and ex-panded arable land, and it was during the centuries of Roman supremacy that the Levant entered upon a periodof unsurpassed prosperity.7 Numerous pottery fragments and ceramic oil lamps, found in and around qanats, have shown clearly that qanatsin this region were constructed in Roman times and used during the Byzantine era.8 Historical records also showthat the Romans constructed qanats in Jordan, Tunisia, and other places throughout their empire;9 or at least the Jordanian Qanat Romani Roman political-economic system organized and funded the labor needed to build qanats, though the engineersand laborers were likely natives of the region in the employ of the Roman state.
The interiors of some qanats in northern JOrdan are marked with crosses and other Byzantine inscriptions,10 andNear Eastern qanats are spatially associated with Roman-Byzantine sites. For example, 40 percent are sited inthe immediate vicinity of smaller Romano-Byzantine outposts and guardhouses.11 Every qanat in Jordan is adja-cent to Roman and Byzantine settlements or outposts. Because the supporting evidence is strong, most scholarsbelieve that Jordan's qanats were built by the Romans and used by the Byzantines from the 1st century B.C. tothe 7th century A.D.
Some of these qanats continued to be used during the early Islamic period, when the Umayyad caliphate (A.D.
661-750) controlled agriculture and trade in this region. Some of Syria's qanats were even built during Umayyadrule, when the Islamic empire was at its political and geographical zenith, Syria became the most prosperousprovince of any Islamic caliphate, and agricultural production was expanded through much of the region.12 Thediffusion and historic utilization of qanats throughout the Old World - from the Iberian peninsula to central Asia- mirrors the historic dispersal of Islam.
The Umayyad contribution of Jordan's qanats is less clear. Features associated with Umayyad culture-ceramicshards, oil lamps, settlement, and agriculture - have been found in and around qanats in the Arava Valley and atUdhruh, Ma'an, and Abila,13 and irrigation systems in the Jordan Valley were maintained under the Umayyadcaliphate.14 Therefore, the Islamic Umayyads appear to have utilized at least some of the qanats they inheritedin this region, but this whole area remained marginal to Umayyad trade, and demand for agricultural productsfrom this peripheral region began to fall off after its severance from Byzantium.
By A.D. 750, the Islamic Abbasids had conqured the Umayyads and established the caliphate in Baghdad. Syriawas reduced to a province within this empire, and Jordan was further marginalized. By the middle of the 8thcentury in Jordan, after accession of the A???? dynasty, there began a gradual retreat of agriculture from thefrontiers established under the Roman and Byzantines, many settlements and agricultural sites were abandonedand overrun with Bedouin tribesmen,15 and none of Jordan's qanats were used after this time (with one briefexception noted below).
So long did the qanats of Jordan lay abandoned that knowledge of their existence or their original purpose fellaway from oral history in the region. Fanciful tales were concocted to account for the presence of these chainsof wells - variously described as defensive pits or wells built for thirsty armies by local heroes and conquerors -stories sometimes repeated today by the few people who are aware that chains of wells (or qanats) exist in thecountry. In contrast to Syria, where most farmers and villagers have at least heard of qanat Romani, the frequentabsence of the very concept of subterranean aqueducts in the rural Jordanian tradition suggests that there werenever many qanats in Jordan and that they have lain abandoned for a very long time.
Material culture and a few fragments from oral tradition suggest that the qanats of Jordan were originally con-structed by Romans. Yet there were many Roman sites that never operated qanats, including the Decapolis cities,the largest Roman settlements in the region (fig. 2).16 Obviously, then, something more than the "presence of Ro-mans" affected where and to what extent qanats would be built in this region.
Ecology of Jordan's Qanats
Most of the qanats in Jordan (twenty-two of thirty-two galleries) were constructed in semi-arid regions receiving100 to 300 millimeters average annual precipitation. This mirrors the pattern in Iran and Syria, where the majorqanat systems are found where precipitation ranges from 100 to 300 millimeters per year.17 Drier regions were notpermanently settled by Romans or Byzantines and remained, as today, inhabited by nomadic Bedouin herdsmennot inclined toward irrigation- dependent sedentism. More humid settlements were rarely supported by qanatirrigation in Syria, or elsewhere throughout the Near East and North Africa, yet six sites in Jordan (containingten qanat galleries) are clustered around the south bank of the Yarmouk River, in an area receiving 400 to 500millimeters average annual precipitation. However, settlement in Jordan, even in mountainous regions withtheir more abundant rainfall, is possible only near springs and wells where provision is made for storing winterrains; ten times the amount of land is needed to support a family or settlement in this region when agricultureis entirely dependent on rain rather than some form of irrigation.18 Yet factors other than rainfall alone must account for the existence of qanats in this northwest corner of Jordan.
For example, this is the area of Jordan most heavily and permanently settled by Romans, since it is contiguous
Jordanian Qanat Romani to the more humid and more heavily settled areas of the Mediterranean littoral, and this is one of the mostfavorable areas in Jordan for constructing qanats with regard to the suitability of aquifers.
Figure 2. Roman Decapolis cities with and without qanats (contemporary names of these settlements are provided in paren-theses).
Topography and Hydrology
Because qanats tap into shallow aquifers - in alluvial fans or synclinal (down-folded or basin-shaped) rock beds- at the base of hills or mountains, or along the margins of larger wadis (stream channels) coming out of themountains, there is a close relationship between qanats and upland topography. All of Jordan's qanats wereconstructed within the piedmont (French, literally "foot of the mountain") zone, mostly at elevations of 1,500 to3,000 fett, with the exception of the qanats at Ma'an, which lie only 10 kilometers from a high range of hills andtap into aquifers fed from those highlands. Where groundwater is available farther from the uplands, it tendsto be brackish and otherwise of poorer quality than water found in or very near the mountains. Therefore, theuplands supply qanats with both a greater quantity and a better quality of groundwater, and they were neverbuilt beyond the montane (mountain area) piedmont zone.19 In most of the steppe and desert regions of Jordan and Syria, deposits of silica (e.g., quartz, chert, flint) oftenform impervious layers beneath the permeable calcareous (calcium carbonate) formations nearer the surface.20 Itis in regions with these conditions that the Roman engineers exploited the water-bearing strata to build qanats,tunneling most of their channels through solid beds of limestone.
In most of Syria, limestone and chalk aquifrs are relatively shallow- a few meters to tens of meters deep. Someof the same tertiary and quaternary period carbonate rocks comprise aquifer beds in Jordan, but they are far Jordanian Qanat Romani less accessible. In most of the country, groundwater lies at depths greater than 100 meters, the result of waterhorizons being drained and the water level lowered by the main rift (geologic fault depression, the Jordan andArava valleys) in the west and the large, deeply eroded wadis which cut inland and draw water out to the riftvalley.21 In a few of the areas settled by Romans, however, water-bearing rock or gravel is found closer to the surface- as shallow as 5 to 20 meters around Ma'an-Udhruh and in Jordan Valley.22 Two qanats near Ma'an and amultibranched gallery at Udhruh (each varying from 2 to 5 kilometers in length) were cut into hard limestoneaquifers at depths of 5 to 10 meters. Nineteen now obliterated qanats around Karama once tapped into theshallow (7 to 17 meters) water-bearing gravles of alluvial fans (fan or cone-shaped masses of stream-depositedsediment), which move down into the Jordan Valley from the western slopes of the Moab Mountains.23 All alongthe rift valleys of Jordan - the Jordan Valley and the Arava Valley - there are numerous gravelly wadis flowingout of mountains, creating many alluvial fans and bajadas (ramps of sediment along a mountain base) that couldbe tapped by qanats. However, qanats have been found in these valleys only around Karama on the east bank ofthe Jordan, around Fasayil on the west bank, and on the west side of the Wadi Araba (see fig. 1).
Scholars who have studied qanats on the western (Israeli) side of the Arava Valley have either speculated orasserted, without the proof of seeing, that qanats also must exist on the east bank of the valley.24 However,Burrows and Speiser surveyed both sides of the valley during the British mandate era and, as I did, found noevidence of qanats on the eastern (Jordanian) side.25 This seems logical if we consider the pattern of settlementand transportation in the ancient Arava Valley. The Nabateans, predating the Romans in this region, establisheda trade route along the eastern side of the Arava Valley, and there is evidence that Romans, too, had traveledthis path.26 But the oases on the western side of the Arava Valley - those served by qanats - were situated on theprimary high road linking the Red Sea port of Eilat, via the Negev, with the populated regions to the north andnorthwest.27 Qanats in the north of Jordan - near the Yarmouk River - are deeper than those found elsewhere in the Levant.
Each of the qanats at these seven northern sites is cut into a thick limestone bed to depths of 10 to 60 meters, andthey vary in length from 1 to 6 kilometers.28 The hydrologic conditions characteristic of the Yarmouk region ofJordan, presumably, are duplicated on the north (Syrian) bank of the Yarmouk River. Yet in spite of the fertilityof this latter region - known as the Hauran plain, the granary of Syria - not a single qanat was constructed there.
Unlike the landscape south of the Yarmouk, where limestone comes to the surface and many qanats are found,the northern (Syria) Yarmouk Valley is completely covered by an extensive basalt (fine-grained volcanic rock)flow which originates in the eastern Golan Heights, covers much of the fertile Hauran plain of southwesternSyria, and runs to the very edge of the gorge that overlooks the Yarmouk River. The volcanic soils of the norhtbank are generally better for agriculture than the limestone soils of the southern (Jordanian) side,29 but qanatswere never constructed in basalt zones because of the difficulty of boring qanat shafts through basalt and becausebasalt, or other impermeable surface materials, will inhibit recharge to underlying aquifers.30 One additional aquifer characteristic may help further to account for the limited use of qanats in this Romanfrontier: groundwater transmissivity, related to the ease of water flow through an aquifer. Even if a greaterarea of Jordan had been underlain by shallow aquifers, allowing Roman engineers to exploit groundwater withqanats on a grander scale (assuming, of course, the political economic impetus to build more qanats existed), theutility of qanats still would have been limited by the slow rate at which groundwater with qanats on a granderscale (assuming, of course, the politial-economic impetus to build more qanats existed), the utility of qanats stillwould have been limited by the slow rate at which groundwater flows through most aquifers in the region. Moretransmissive groundwater flow is relatively rare in Jordanian aquifers;31 and though early qanat engineers werenot apprised of these hydraulic flow rates, they were surely aware of the spatial variation in natural spring flow,which is affected by aquifer transmissivity.
The combination of shallower aquifers with more transmissive groundwater flow provided the best conditionsfor exploiting underground waters with a qanat, and such ideal conditions in Jordan are exceedingly rare (fig. 3).
Yet all of the qanats in Jordan were constructed in areas underlain by shallow aquifers with transmissive flow,and very few of the areas that possess these characteristics were ignored by Roman qanat engineers.
Jordanian Qanat Romani Figure 3. Best aquifer conditions for qanats in Jordan. Shaded areas indicate shallow aquifers with transmissive flow.
Qanats in a Modern Levant
In most of the world where qanats are found, they have continued to provide irrigation and drinking waterto farms and cities well into this century, and qanats still function in parts of China, Afghanistan, Pakistan,Iran, Iraq, Oman, Saudi Arabia, Syria, Egypt, Algeria, and Morocco. But in each of these areas in recent years,qanats have been challenged by newer hydraulic technologies - especially the mechanically pumped tube well -which have led to epochal abandonment of qanats as social systems have undergone corresponding change andwater tables have fallen. Modern technologies never had the chance to compete with qanats in Jordan, however,because qanats were abandoned there centuries ago - long before drip irrigation, modern dams, and pumpedwells were introduced - with one notable exception.
Six qanats around Karama in the Jordan Valley were reopened in the 1920s by Amir Abdullah's engineers andused for irrigating about 600 hectares of fields and gardens near the winter palace of Abdullah, the titular rulerof early Jordan. Gardens once again flourished in this desert where no cultivated plants had thrived since theByzantine period.32 Beginning in the late 1930s, private farmers began buying land from Abdullah's state hold-ings around Karama, including those parcels irrigated with qanats. In the early 1960s, farmers in the regionbegan installing diesel-pumped wells in order to increase the supply of water for irrigation, but as more waterwas withdrawn from local aquifers than was being recharged, the water table around Karama fell, and all of theqanats dried up by 1970. A coup de grace was dealt to these qanats when they were permanently effaced in 1975by the Jordan Valley Authority, which used earthmoving equipment to level the ground all around the Karamaregion in preparation for an extension of the East Ghor/King Abdullah canal.
Jordanian Qanat Romani Throughout the history of Levant, Jordan has straddled the frontier zone separating the desert and the sown,which always has been the decisive factor affecting the economic proseperity of the region. This boundary be-tween the settled cultivators and the pastoral nomads is an extremely dynamic one, fluctuating one way oranother from one year to the next and migrating great distances over longer spans of time.33 Sedentary agriculture can prosper only during periods of efficient and stable government, and at no time inthe history of the Levant has so much land between the desert and the sown been brought under cultivationas during the Romano-Byzantine period.34 Qanat irrigation in Jordan was developed and abandoned as theseearly Levant empires waxed and waned. When their settlements disappeared or their populations dwindled,the maintenance of qanats ceased, and qanats were abandoned. Qanats were an important source of irrigationin neighboring regions, including Syria - one of the breadbaskets of the Roman empire and an important sourceregion of agricultural commodities for subsequent Islamic empires.35 But even the more humid and hospitableareas of Jordan were neither breadbasket nor political hearth. In constrast to Syria, Jordan remained at the pe-riphery of the Romano-Byzantine and early Islamic empires. As a result, it was never settled as completely, itsresources were never exploited as intensively, and it remained more prone to a form of boom-and-bust economyas the strength and influence of these empires waxed and waned, usurping the people and resources at theirmargins and then retreating back to their core areas. Furthermore, most aquifers in Jordan have poor transmis-sivity, are found at great depth, and were far less accessible to the builders of qanats than those in Syria. Thegeneral inaccessibility of groundwater in Jordan, combined with the failure of early Levant empires to integratethis volatile border zone fuly into their trade and transportation systems, conspired to inhibit construction ofand reliance upon qanats in the early settled areas of Jordan.
Note: This article is excerpted from "Qanats in the Levant: Hydraulic Techonology at the Periphery of EarlyEmpires," Technology and Culture (38:2) 1997, pp. 432-451.
1. Michael Fuller, Abila Reports (Amman, 1986), unpublished manuscript at the American Center of Oriental Research, Amman; Nelson Glueck, The River Jordan (Philadelphia, 1946), p.129.
2. A. Reifenberg, The Struggle between the Desert and the Sown (Jerusalem, 1955), p.51.
3. Ian Manners, "The Development of Irrigation Agriculture in the Hashemite Kingdom of Jordan, with Partic- ular Reference to the Jordan Valley" (Ph.D. diss., Oxford University, 1969), p. 255.
4. For a more lengthy discussion of the similarities and differences between qanats and spring tunnels, see Zvi Y.D. Ron, "Development and Management of Irrigation Systems in the Mountainous Regions of the HolyLand," Transactions of the Institute of British Geographers 10 (1985); and Zvi Y.D. Ron, "Ancient and ModernDevelopment of Water Resources in the Holy Land and the Arab-Israeli Conflict - A Reply," Transactions ofthe Institute of British Geographers 11 (1986).
5. Dale R. Lightfoot and James A. Miller, "Sijilmassa: The Rise and Fall of a Walled Oasis in Medieval Morocco," Annals of the Association of American Geographers 86 (1996): 78-101.
6. The westernmost portion of Jordan was first attached to Rome as a vassal state in 64 B.C. In A.D. 6, much of the territory of Jordan settled by Rome was upgraded to a Roman senatorial province. Between 64 B.C.,when Pompey constituted the Province of Syria, and A.D. 106, when Trajan succeeded in extending Romangovernment up to the desert margin, the territories east of the Jordan and Arava valleys remained exposedand unsettled. George Adam Smith, The Historical Geography of the Holy Land (New York, 1908), p. 596.
7. Harry Charles Luke and Edward Keith-Roach, eds., The Handbook of Palestine and Transjordan (London, 1930), pp. 416, 418; Manners, p. 254.
8. Evenari, Shanan, and Tadmore, pp. 173-78; Fuller (n. 1 above), p. 275; Nelson Glueck, "Some Ancient Towns in the Plains of Moab," Bulletin of the American Schools of Oriental Research 91 (1943): 9; Glueck, "Explorationsin Eastern Palestine," The Annual of the American Schools of Oriental Research 4 (1951): 361; M. G. Ionides,Report on the Water Resources of the Transjordan and Their Development (London, 1940), p. 169; Alistair C. Killick,"Udhruh - 1980, 1981, 1982 Seasons: A Preliminary Report," Annual of the Department of Antiquities of Jordan 27(1983): 231; Alistair C. Killick, "Udhruh and the Southern Frontier: The Defense of the Roman and ByzantineEast," British Archaeological Reports 297 (1986): 438; Alistair C. Killick, Udhruh: Caravan City and Desert Oasis(Hampshire, 1987), p.28; Ron, "Ancient and Modern Development," p. 363 and "Qanats and Spring FlowTunnels," p.219.
Jordanian Qanat Romani 9. Dante A. Caponera, "Water Laws in Moslem Countries," FAO Development Paper 43 (Rome, 1954), p. 45.
11. Dale R. Lightfoot, "Syrian Qanat Romani: History, Ecology, Abandonment," Journal of Arid Environments 33 (1996): 321-36.
12. Henri Goblot, Les qanat: Une technique d'acquisition de l'eau (Paris, 1979), pp. 127-32; Iwao Kobori, "Les qanat en Syrie," in Techniques et pratiques hydro-agricoles traditionnelles en domaine irrigue 2, ed. Bernard Geyer (Paris,1990), pp. 321-28; Nazim Moussly, Le probleme de l'eau en Syrie (Lyons, 1951), pp.146-51; D. Sourdel, La civili-sation de l'Islam classique (Paris, 1968).
13. Fuller (n. 1 above); Killick (n. 9 above); Ron, "Qanats and Spring Flow Tunnels" (n. 6 above).
14. Reifenberg (n. 2 above), p. 99.
15. Fuller; Killick; Manners (n. 3 above); Ron, "Qanats and Spring Flow Tunnels." 16. The Decapolis was originally a confederation of Greek cities forming a Hellenistic barrier against desert raids and Nabateans. These cities later were reorganized by Pompey and played a similar role as civilized,garrisoned settlements at the periphery of the Roman empire, enabling the Romans to put an end to desertraids and facilitating an outburst of commercial and agricultural activity after the 2nd century A.D. Duringthis era, the Decapolis became Roman in character, achieved its zenith in growth and development, and waslargely responsible for transferring Roman cultural influences to Transjordan. Luke and Keith- Roach (n. 8above), pp. 409, 415; Benjamin Shwadran, Jordan: A State of Tension (New york, 1959), pp. 30,65.
17. Peter, Beaumont, "The Qanat: A Means of Water Provision from Groundwater Sources," in Beaumont, Bonine, and McLachlan (n. 6 above), p. 27; Lightfoot (n. 12 above).
18. Reifenberg (n. 2 above), pp. 51-52.
19. This relationship has been noted in several articles and texts on qanats and also has been clearly established through my fieldwork conducted in Syria in 1993-94.
20. Reifenberg, p. 53.
21. Ionides (n. 9 above), p.4.
22. There is evidence of continuous deterioration of vegetation, soil, and water resources since the Roman period, resulting in a general lowering of the water table in parts of Jordan so that many springs have dried up.
Water depths cited here reflect more recent measurements yet still correspond roughly to the depths of oldqanat shafts. Thus, it appears that depth to groundwater in these shallower aquifer zones has dropped onlyslightly since Roman times, although depth to groundwater elsewhere certainly could have dropped moreappreciably. H. Vierhuff and K. Trippler, "Groundwater Resources," National Water Master Plan of Jordan IV(Amman, 1977); S. G. Willimott et al., Conservation Survey of the Southern Highlands of Jordan (Amman, 1964),p.57.
23. Michael Baker, "Irrigation and Drainage," The Yarmouk-Jordan Valley Project: Master Plan Report 4 (Rochester, N.Y., 1955); Ionides: Ron, "Qanats and Spring Flow Tunnels" (n. 6 above). Baker (p.8) reports nineteen qanatson the east bank and three on the west bank of the Jordan Valley. Ron (p. 214) says that there were nine qanatson the east bank. All evidence of qanats here was erased from the surface in 1975, in preparation for buildingthe East Ghor canal, so the earlier report is likely valid.
24. Evenari, Shanan, and Tadmor (n. 6 above), p. 178; Daniel Hillel, Negev: Land, Water and Life in a Desert Envi- ronment (New York, 1982), p. 177.
25. Millar Burrows and E.A. Speiser, "Explorations in Ancient Palestine II," The Annual of the American Schools of Oriental Research 15 (1935):39-41. Hillel asserts that "a thorough investigation of both sides of the AravaValley will reveal many more [qanats] than are known at the present." Evenari, Shanan, and Tadmor (p. 178)says that many qanat systems dot the Arava Valley on the "western (Israeli) side of the Arava, as well asthe eastern flank, which is in Jordanian territory and could obviously not be surveyed by us." This begs thequestion of how they could know there are qanats on the east bank of the Arava Valley and found no qanats.
Burrows and Speiser surveyed both sides of the Arava Valley in 1935, when the area was still under Britishcontrol. They, too, found qanats on the west bank of the valley but having a "conduit" that carried water toa birkeh (pool) near the caravanserai, situated at the mouth of the wadi. I field-checked this site in 1994 andfound no evidence of a qanats at Gharandel, which is now a Jordanian Army post.
26. Burrows and Speiser 27. Hillel, pp. 177-78.
Jordanian Qanat Romani 28. All of the qanats in this region have square surface or maintenance shafts (Roman putei), bored into the sides of limestone hills at steep 50- or 60-degree angles from the horizontal. This feature of construction is not onlyremarkably uniform in this area but also highly unique; the surface shafts for all other qanats in Syria, Jordan,or elsewhere are round and enter the qanat at a 90-degree (or vertical) angle.
29. Smith (n. 7 above), p. 78.
30. Lightfoot (n. 12 above) 31. Vierhuff and Trippler (n. 25 above).
32. Glueck, River Jordan (n. 1 above), p. 129.
33. Manners (n. 3 above), p. 252.
34. Luke and Keith-Roach (n. 8 above), pp. 416-18; Reifenberg (n. 2 above), p. 91; Willimott et al. (n. 25 above), p.
35. Reifenberg, pp. 39-40.
Institute of Agriculture and Animal Science Tribhuwan University An Assignment on Medicinal Plants Dr. Krishna Kumar Pant Associate Professor Department of Environment Science B.Sc. Ag. 5th semester Introduction to Medicinal Plants Medicinal Plants Medicinal plants have been identified and used throughout human history. Before the introduction of chemical medicines, man relied on the healing properties of medicinal plants. Some people value these plants due to the ancient belief which says plants are created to supply man with food, medical treatment, and other effects. There are nearly 2000 ethnic groups in the world, and almost every group has its own traditional medical knowledge and experiences. Plants have the ability to synthesize a wide variety of chemical compounds that are used to perform important biological functions, and to defend against attack from predators such as insects, fungi and herbivorous mammals. At least 12,000 such compounds have been isolated so far; a number estimated to be less than 10% of the total. Chemical compounds in plants mediate their effects on the human body through processes identical to those already well understood for the chemical compounds in conventional drugs; thus herbal medicines do not differ greatly from conventional drugs in terms of how they work. The use of herbs to treat disease is almost universal among non-industrialized societies, and is often more affordable than purchasing expensive modern pharmaceuticals. The World Health Organization (WHO) estimates that 80% of the population of some Asian and African countries presently use herbal medicine for some aspect of primary health care. Their use is less common in clinical settings, but has become increasingly more in recent years as scientific evidence about the effectiveness of herbal medicine has become more widely available. Medicinal and aromatic plants (MAPs) are an important part of the Nepalese economy, with exports to India, Hong Kong, Singapore, Japan, as well as France, Germany, Switzerland, the Netherlands, the USA, and Canada. These plants have a potential for contributing to the local economy, subsistence health needs, and improved natural resource management, leading to the conservation of ecosystem and biodiversity of an area. Nepal's ethnic diversity is also remarkable, so are the traditional medical practices. About 85% of total population inhabit in rural areas, and many of them rely on traditional medicines, mostly prepared from plants for health care. The majority of Nepal's population, especially the poor, tribal and ethnic groups, and mountain people, relies on traditional medical practices. A large number of products for such medical practices are derived from plants. The knowledge of such medical practices has been developed and tested through generations. In many cases this knowledge is transmitted orally from generation to generation and confined to certain people. In this paper, we will discuss about two particular medicinal plants, Aloe and Datura. Aloe vera is frequently cited as being used in herbal medicine since the beginning of the first century AD. Extracts from A. vera are widely used in the cosmetics and alternative medicine industries, being marketed as variously having rejuvenating, healing, or soothing properties. Datura, although widely known as weed, has be used significantly along the history owing to its deliric effects. It has been known to have been used in witchcraft, religious processions and more. Medically, it is used as anti-inflammatory drug. Because of its toxic property, it's used has be controversial among physicians for a long time. Let's explore these plants along with their cultivation practice, phytochemical properties and medical use in detail.