Euphrates

The Euphrates (/juːˈfreɪtiːz/; Arabic: الفرات‎: al-Furāt, Syriac: ̇ܦܪܬ: Pǝrāt, Armenian: Եփրատ: Yeprat, Hebrew: פרת‎: Prat, Turkish: Fırat, Kurdish: Firat) is the longest and one of the most historically important rivers of Western Asia. Together with the Tigris, it is one of the two defining rivers of Mesopotamia. Originating in eastern Turkey, the Euphrates flows through Syria and Iraq to join the Tigris in the Shatt al-Arab, which empties into the Persian Gulf.

Etymology

The Ancient Greek form EuphrátÄ"s (Ancient Greek: Εὐφράτης) was borrowed from Old Persian Ufrātu, itself from Elamite ú-ip-ra-tu-iÅ¡. In Akkadian the river was similarly called Purattu, which has been perpetuated in Semitic languages (cf. Syriac P(É™)rāṯ, Arabic al-Furrāt) and in other nearby languages of the time (cf. Hurrian Puranti, Sabarian Uruttu). The Elamite, Akkadian, and possibly Sumerian forms are suggested to be from an unrecorded substrate language. Gamkrelidze and Ivanov suggest the Proto-Sumerian *burudu "copper" (Sumerian urudu) as an origin, with an explanation that Euphrates was the river by which the copper ore was transported in rafts, since Mesopotamia was the center of copper metallurgy at the period.

The earliest references to the Euphrates come from cuneiform texts found in Shuruppak and pre-Sargonic Nippur in southern Iraq and date to the mid-3rd millennium BCE. In these texts, written in Sumerian, the Euphrates is called Buranuna (logographic: UD.KIB.NUN). The name could also be written KIB.NUN.(NA) or ^dKIB.NUN, with the prefix "^d" indicating that the river was a divinity. In Sumerian, the name of the city of Sippar in modern-day Iraq was also a written UD.KIB.NUN, indicating a historically strong relationship between the city and the river.

Course

The Euphrates is the longest river of Western Asia. It emerges from the confluence of the Kara Su or Western Euphrates (450 kilometres (280 mi)) and the Murat Su or Eastern Euphrates (650 kilometres (400 mi)) 10 kilometres (6.2 mi) upstream from the town of Keban in southeastern Turkey. Daoudy and Frenken put the length of the Euphrates from the source of the Murat River to the confluence with the Tigris at 3,000 kilometres (1,900 mi), of which 1,230 kilometres (760 mi) falls in Turkey, 710 kilometres (440 mi) in Syria and 1,060 kilometres (660 mi) in Iraq. The same figures are given by Isaev and Mikhailova. The length of the Shatt al-Arab, which connects the Euphrates and the Tigris with the Persian Gulf, is given by various sources as 145â€"195 kilometres (90â€"121 mi).

Both the Kara Su and the Murat Su rise northwest from Lake Van at elevations of 3,290 metres (10,790 ft) and 3,520 metres (11,550 ft) amsl, respectively. At the location of the Keban Dam, the two rivers, now combined into the Euphrates, have dropped to an elevation of 693 metres (2,274 ft) amsl. From Keban to the Syrianâ€"Turkish border, the river drops another 368 metres (1,207 ft) over a distance of less than 600 kilometres (370 mi). Once the Euphrates enters the Upper Mesopotamian plains, its grade drops significantly; within Syria the river falls 163 metres (535 ft) while over the last stretch between HÄ«t and the Shatt al-Arab the river drops only 55 metres (180 ft).

Discharge of the Euphrates

The Euphrates receives most of its water in the form of rainfall and melting snow, resulting in peak volumes during the months April through May. Discharge in these two months accounts for 36 percent of the total annual discharge of the Euphrates, or even 60â€"70 percent according to one source, while low runoff occurs in summer and autumn. The average natural annual flow of the Euphrates has been determined from early- and mid-twentieth century records as 20.9 cubic kilometres (5.0 cu mi) at Keban, 36.6 cubic kilometres (8.8 cu mi) at HÄ«t and 21.5 cubic kilometres (5.2 cu mi) at Hindiya. However, these averages mask the high inter-annual variability in discharge; at Birecik, just above the Syroâ€"Turkish border, annual discharges have been measured that ranged from a low volume of 15.3 cubic kilometres (3.7 cu mi) in 1961 to a high 42.7 cubic kilometres (10.2 cu mi) in 1963.

The discharge regime of the Euphrates has changed dramatically since the construction of the first dams in the 1970s. Data on Euphrates discharge collected after 1990 show the impact of the construction of the numerous dams in the Euphrates and of the increased withdrawal of water for irrigation. Average discharge at Hīt after 1990 has dropped to 356 cubic metres (12,600 cu ft) per second (11.2 cubic kilometres (2.7 cu mi) per year). The seasonal variability has equally changed. The pre-1990 peak volume recorded at Hīt was 7,510 cubic metres (265,000 cu ft) per second, while after 1990 it is only 2,514 cubic metres (88,800 cu ft) per second. The minimum volume at Hīt remained relatively unchanged, rising from 55 cubic metres (1,900 cu ft) per second before 1990 to 58 cubic metres (2,000 cu ft) per second afterward.

Tributaries

In Syria, three rivers add their water to the Euphrates; the Sajur, the Balikh and the Khabur. These rivers rise in the foothills of the Taurus Mountains along the Syroâ€"Turkish border and add comparatively little water to the Euphrates. The Sajur is the smallest of these tributaries; emerging from two streams near Gaziantep and draining the plain around Manbij before emptying into the reservoir of the Tishrin Dam. The Balikh receives most of its water from a karstic spring near 'Ayn al-'Arus and flows due south until it reaches the Euphrates at the city of Ar-Raqqah. In terms of length, drainage basin and discharge, the Khabur is the largest of these three. Its main karstic springs are located around Ra's al-'Ayn, from where the Khabur flows southeast past Al-Hasakah, where the river turns south and drains into the Euphrates near Busayrah. Once the Euphrates enters Iraq, there are no more natural tributaries to the Euphrates, although canals connecting the Euphrates basin with the Tigris basin exist.

Watershed

The drainage basins of the Kara Su and the Murat River cover an area of 22,000 square kilometres (8,500 sq mi) and 40,000 square kilometres (15,000 sq mi), respectively. The estimates that have been made for the area of the Euphrates drainage basin vary widely; from a low 233,000 square kilometres (90,000 sq mi) to a high 766,000 square kilometres (296,000 sq mi). Recent estimates put the basin area at 388,000 square kilometres (150,000 sq mi), 444,000 square kilometres (171,000 sq mi) and 579,314 square kilometres (223,674 sq mi). The greater part of the Euphrates basin is located in Turkey, Syria and Iraq. According to both Daoudy and Frenken, Turkey's share is 28 percent, Syria's is 17 percent and that of Iraq is 40 percent. Isaev and Mikhailova estimate the percentages of the drainage basin lying within Turkey, Syria and Iraq at 33, 20 and 47 percent respectively. Some sources estimate that approximately 15 percent of the drainage basin is located within Saudi Arabia, while a small part falls inside the borders of Kuwait. Finally, some sources also include Jordan in the drainage basin of the Euphrates; a small part of the eastern desert (220 square kilometres (85 sq mi)) drains toward the east rather than to the west.

Natural history

The Euphrates flows through a number of distinct vegetation zones. Although millennia-long human occupation in most parts of the Euphrates basin has significantly degraded the landscape, patches of original vegetation remain. The steady drop in annual rainfall from the sources of the Euphrates toward the Persian Gulf is a strong determinant for the vegetation that can be supported. In its upper reaches the Euphrates flows through the mountains of Southeast Turkey and their southern foothills which support a xeric woodland. Plant species in the moister parts of this zone include various oaks, pistachio trees, and Rosaceae (rose/plum family). The drier parts of the xeric woodland zone supports less dense oak forest and Rosaceae. Here can also be found the wild variants of many cereals, including einkorn wheat, emmer wheat, oat and rye. South of this zone lies a zone of mixed woodland-steppe vegetation. Between Raqqa and the Syroâ€"Iraqi border the Euphrates flows through a steppe landscape. This steppe is characterised by white wormwood (Artemisia herba-alba) and Chenopodiaceae. Throughout history, this zone has been heavily overgrazed due to the practicing of sheep and goat pastoralism by its inhabitants. Southeast of the border between Syria and Iraq starts true desert. This zone supports either no vegetation at all or small pockets of Chenopodiaceae or Poa sinaica. Although today nothing of it survives due to human interference, research suggests that the Euphrates Valley would have supported a riverine forest. Species characteristic of this type of forest include the Oriental plane, the Euphrates poplar, the tamarisk, the ash and various wetland plants.

Among the fish species in the Tigrisâ€"Euphrates basin, the family of the Cyprinidae are the most common, with 34 species out of 52 in total. Among the Cyprinids, the mangar has good sport fishing qualities, leading the British to nickname it "Tigris salmon." The Rafetus euphraticus is an endangered soft-shelled turtle that is limited to the Tigrisâ€"Euphrates river system.

The Neo-Assyrian palace reliefs from the 1st millennium BCE depict lion and bull hunts in fertile landscapes. Sixteenth to nineteenth century European travellers in the Syrian Euphrates basin reported on an abundance of animals living in the area, many of which have become rare or even extinct. Species like gazelle, onager and the now-extinct Arabian ostrich lived in the steppe bordering the Euphrates valley, while the valley itself was home to the wild boar. Carnivorous species include the gray wolf, the golden jackal, the red fox, the leopard and the lion. The Syrian brown bear can be found in the mountains of Southeast Turkey. The presence of European beaver has been attested in the bone assemblage of the prehistoric site of Abu Hureyra in Syria, but the beaver has never been sighted in historical times.

River modifications

The Hindiya Barrage on the Iraqi Euphrates, based on plans by the British civil engineer William Willcocks and finished in 1913, was the first modern water diversion structure built in the Tigrisâ€"Euphrates river system. The Hindiya Barrage was followed in the 1950s by the Ramadi Barrage and the nearby Abu Dibbis Regulator, which serve to regulate the flow regime of the Euphrates and to discharge excess flood water into the depression that is now Lake Habbaniyah. Iraq’s largest dam on the Euphrates is the Haditha Dam; a 9-kilometre (5.6 mi) long earth-fill dam creating Lake Qadisiyah. Syria and Turkey built their first dams in the Euphrates in the 1970s. The Tabqa Dam in Syria was completed in 1973 while Turkey finished the Keban Dam, a prelude to the immense Southeastern Anatolia Project, in 1974. Since then, Syria has built two more dams in the Euphrates, the Baath Dam and the Tishrin Dam, and plans to build a fourth dam â€" the Halabiye Dam â€" between Ar-Raqqah and Deir ez-Zor. The Tabqa Dam is Syria's largest dam and its reservoir (Lake Assad) is an important source of irrigation and drinking water. It was planned that 640,000 hectares (2,500 sq mi) should be irrigated from Lake Assad, but in 2000 only 100,000â€"124,000 hectares (390â€"480 sq mi) had been realized. Syria also built three smaller dams on the Khabur and its tributaries.

With the implementation of the Southeastern Anatolia Project (Turkish: GüneydoÄŸu Anadolu Projesi, or GAP) in the 1970s, Turkey launched an ambitious plan to harness the waters of the Tigris and the Euphrates for irrigation and hydroelectricity production and provide an economic stimulus to its southeastern provinces. GAP affects a total area of 75,000 square kilometres (29,000 sq mi) and approximately 7 million people; representing about 10 percent of Turkey's total surface area and population, respectively. When completed, GAP will consist of 22 dams â€" including the Keban Dam â€" and 19 power plants and provide irrigation water to 1,700,000 hectares (6,600 sq mi) of agricultural land, which is about 20 percent of the irrigable land in Turkey. Circa 910,000 hectares (3,500 sq mi) of this irrigated land is located in the Euphrates basin. By far the largest dam in GAP is the Atatürk Dam, located circa 55 kilometres (34 mi) northwest of Åžanlıurfa. This 184-metre (604 ft) high and 1,820-metre (5,970 ft) long dam was completed in 1992; thereby creating a reservoir that is the third-largest lake in Turkey. With a maximum capacity of 48.7 cubic kilometres (11.7 cu mi), the Atatürk Dam reservoir is large enough to hold the entire annual discharge of the Euphrates. Completion of GAP was scheduled for 2010 but has been delayed because the World Bank has withheld funding due to the lack of an official agreement on water sharing between Turkey and the downstream states on the Euphrates and the Tigris.

Apart from barrages and dams, Iraq has also created an intricate network of canals connecting the Euphrates with Lake Habbaniyah, Lake Tharthar, and Abu Dibbis reservoir; all of which can be used to store excess floodwater. Via the Shatt al-Hayy, the Euphrates is connected with the Tigris. The largest canal in this network is the Main Outfall Drain or so-called "Third River;" constructed between 1953 and 1992. This 565-kilometre (351 mi) long canal is intended to drain the area between the Euphrates and the Tigris south of Baghdad to prevent soil salinization from irrigation. It also allows large freight barges to navigate up to Baghdad.

Environmental and social effects

The construction of the dams and irrigation schemes on the Euphrates has had a significant impact on the environment and society of each riparian country. The dams constructed as part of GAP â€" in both the Euphrates and the Tigris basins â€" have affected 382 villages and almost 200,000 people have been resettled elsewhere. The largest number of people was displaced by the building of the Atatürk Dam, which alone affected 55,300 people. A survey among those who were displaced showed that the majority were unhappy with their new situation and that the compensation they had received was considered insufficient. The flooding of Lake Assad led to the forced displacement of circa 4,000 families, who were resettled in other parts of northern Syria as part of a now abandoned plan to create an "Arab belt" along the borders with Turkey and Iraq.

Apart from the changes in the discharge regime of the river, the numerous dams and irrigation projects have also had other effects on the environment. The creation of reservoirs with large surfaces in countries with high average temperatures has led to increased evaporation; thereby reducing the total amount of water that is available for human use. Annual evaporation from reservoirs has been estimated at 2 cubic kilometres (0.48 cu mi) in Turkey, 1 cubic kilometre (0.24 cu mi) in Syria and 5 cubic kilometres (1.2 cu mi) in Iraq. Water quality in the Iraqi Euphrates is low because irrigation water tapped in Turkey and Syria flows back into the river, together with dissolved fertilizer chemicals used on the fields. The salinity of Euphrates water in Iraq has increased as a result of upstream dam construction, leading to lower suitability as drinking water. The many dams and irrigation schemes, and the associated large-scale water abstraction, have also had a detrimental effect on the ecologically already fragile Mesopotamian Marshes and on freshwater fish habitats in Iraq.

The inundation of large parts of the Euphrates valley, especially in Turkey and Syria, has led to the flooding of many archaeological sites and other places of cultural significance. Although concerted efforts have been made to record or save as much of the endangered cultural heritage as possible, many sites are probably lost forever. The combined GAP projects on the Turkish Euphrates have led to major international efforts to document the archaeological and cultural heritage of the endangered parts of the valley. Especially the flooding of Zeugma with its unique Roman mosaics by the reservoir of the Birecik Dam has generated much controversy in both the Turkish and international press. The construction of the Tabqa Dam in Syria led to a large international campaign coordinated by UNESCO to document the heritage that would disappear under the waters of Lake Assad. Archaeologists from numerous countries excavated sites ranging in date from the Natufian to the Abbasid period, and two minarets were dismantled and rebuilt outside the flood zone. Important sites that have been flooded or affected by the rising waters of Lake Assad include Mureybet, Emar and Abu Hureyra. A similar international effort was made when the Tishrin Dam was constructed, which led, among others, to the flooding of the important Pre-Pottery Neolithic B site of Jerf el-Ahmar. An archaeological survey and rescue excavations were also carried out in the area flooded by Lake Qadisiya in Iraq. Parts of the flooded area have recently become accessible again due to the drying up of the lake, resulting not only in new possibilities for archaeologists to do more research, but also providing opportunities for looting, which has been rampant elsewhere in Iraq in the wake of the 2003 invasion.

History

Palaeolithic to Chalcolithic periods

The early occupation of the Euphrates basin was limited to its upper reaches; that is, the area that is popularly known as the Fertile Crescent. Acheulean stone artifacts have been found in the Sajur basin and in the El Kowm oasis in the central Syrian steppe; the latter together with remains of Homo erectus that were dated to 450,000 years old. In the Taurus Mountains and the upper part of the Syrian Euphrates valley, early permanent villages such as Abu Hureyra â€" at first occupied by hunter-gatherers but later by some of the earliest farmers, Jerf el-Ahmar, Mureybet and Nevalı Çori became established from the eleventh millennium BCE onward. In the absence of irrigation, these early farming communities were limited to areas where rainfed agriculture was possible, that is, the upper parts of the Syrian Euphrates as well as Turkey. Late Neolithic villages, characterized by the introduction of pottery in the early 7th millennium BCE, are known throughout this area. Occupation of lower Mesopotamia started in the 6th millennium and is generally associated with the introduction of irrigation, as rainfall in this area is insufficient for dry agriculture. Evidence for irrigation has been found at several sites dating to this period, including Tell es-Sawwan. During the 5th millennium BCE, or late Ubaid period, northeastern Syria was dotted by small villages, although some of them grew to a size of over 10 hectares (25 acres). In Iraq, sites like Eridu and Ur were already occupied during the Ubaid period. Clay boat models found at Tell Mashnaqa along the Khabur indicate that riverine transport was already practiced during this period. The Uruk period, roughly coinciding with the 4th millennium BCE, saw the emergence of truly urban settlements across Mesopotamia. Cities like Tell Brak and Uruk grew to over 100 hectares (250 acres) in size and displayed monumental architecture. The spread of southern Mesopotamian pottery, architecture and sealings far into Turkey and Iran has generally been interpreted as the material reflection of a widespread trade system aimed at providing the Mesopotamian cities with raw materials. Habuba Kabira on the Syrian Euphrates is a prominent example of a settlement that is interpreted as an Uruk colony.

Ancient history

During the Jemdet Nasr and Early Dynastic periods (3100â€"2350 BCE), southern Mesopotamia experienced a growth in the number and size of settlements, suggesting strong population growth. These settlements, including sites like Sippar, Uruk and Kish, were organized in competing city-states. Many of these cities were located along canals of the Euphrates and the Tigris that have since dried up, but that can still be identified from remote sensing imagery. A similar development took place in Upper Mesopotamia, although only in the second part of the 3rd millennium and on a smaller scale than in Lower Mesopotamia. Sites like Mari and Tell Leilan grew to prominence for the first time during this period. Large parts of the Euphrates basin were for the first time united under a single ruler during the Akkadian and Ur III empires, which controlled â€" either directly or indirectly through vassals â€" large parts of modern-day Iraq and northeastern Syria. Following their collapse, Mari asserted its power over northeast Syria while southern Mesopotamia was controlled by city-states like Isin and Larsa before their territories were absorbed by Babylon under Hammurabi in the 18th century BCE. In the second half of the 2nd millennium BCE, the Euphrates basin was divided between Kassite Babylon in the south and Mitanni in the north, with the latter being eventually replaced by Assyria and the Hittite Empire. Following the collapse of the Hittite Empire and the reduction in power of Assyria and Babylonia during the 12th century BCE, struggles broke out between Babylonia and Assyria over the control of the Iraqi Euphrates basin. The Neo-Assyrian Empire eventually emerged victorious out of this conflict and also succeeded in gaining control of the northern Euphrates basin in the first half of the 1st millennium BCE. In the centuries to come, control of the wider Euphrates basin shifted from the Neo-Assyrian Empire to the Neo-Babylonian Empire in the 7th century and to the Achaemenids in the 6th century BCE. The Achaemenid Empire was in turn overrun by Alexander the Great, who defeated the last king Darius III and died in Babylon in 323 BCE. For several centuries, the river formed the eastern limit of effective Egyptian and Roman control and western regions of the Persian Empire.

Modern era

After World War I, the borders in Southwest Asia were redrawn in the Treaty of Lausanne, when the Ottoman Empire was partitioned. Clause 109 of the treaty stipulated that the three riparian states of the Euphrates (at that time Turkey, France for its Syrian mandate and the United Kingdom for its mandate of Iraq) had to reach a mutual agreement on the use of its water and on the construction of any hydraulic installation. An agreement between Turkey and Iraq signed in 1946 required Turkey to report to Iraq on any hydraulic changes it made on the Tigrisâ€"Euphrates river system, and allowed Iraq to construct dams on Turkish territory to manage the flow of the Euphrates.

Turkey and Syria completed their first dams on the Euphrates â€" the Keban Dam and the Tabqa Dam, respectively â€" within one year of each other and filling of the reservoirs commenced in 1975. At the same time, the area was hit by severe drought and river flow toward Iraq was reduced from 15.3 cubic kilometres (3.7 cu mi) in 1973 to 9.4 cubic kilometres (2.3 cu mi) in 1975. This led to an international crisis during which Iraq threatened to bomb the Tabqa Dam. An agreement was eventually reached between Syria and Iraq after intervention by Saudi Arabia and the Soviet Union. A similar crisis, although not escalating to the point of military threats, occurred in 1981 when the Keban Dam reservoir had to be refilled after it had been almost emptied to temporarily increase Turkey's hydroelectricity production. In 1984, Turkey unilaterally declared that it would ensure a flow of at least 500 cubic metres (18,000 cu ft) per second, or 16 cubic kilometres (3.8 cu mi) per year, into Syria, and in 1987 a bilateral treaty to that effect was signed between the two countries. Another bilateral agreement from 1989 between Syria and Iraq settles the amount of water flowing into Iraq at 60 percent of the amount that Syria receives from Turkey. In 2008, Turkey, Syria and Iraq instigated the Joint Trilateral Committee (JTC) on the management of the water in the Tigrisâ€"Euphrates basin and on 3 September 2009 a further agreement was signed to this effect. On April 15, 2014, Turkey began to reduce the flow of the Euphrates into Syria and Iraq. The flow was cut off completely on May 16, 2014. The Euphrates river now terminates at the Turkishâ€"Syrian border. This is in violation of an agreement reached in 1987 in which Turkey committed to releasing a minimum of 500 cubic metres (18,000 cu ft) of water per second at the Turkishâ€"Syrian border.

Economy

Throughout history, the Euphrates has been of vital importance to those living along its course. With the construction of large hydropower stations, irrigation schemes, and pipelines capable of transporting water over large distances, many more people now depend on the river for basic amenities such as electricity and drinking water than in the past. Syria’s Lake Assad is the most important source of drinking water for the city of Aleppo, 75 kilometres (47 mi) to the west of the river valley. The lake also supports a modest state-operated fishing industry. Through a newly restored power line, the Haditha Dam in Iraq provides electricity to Baghdad.