Misplaced Pages

#142857

27-716: The Little Zab rises in the Mountains in Iraq at an elevation of circa 3,000 metres (9,800 ft) amsl . In its upper reaches, the course of the Little Zab is determined by the alignment of the major mountain chains that make up the Zagros. Thus, the river flows through valleys that are predominantly aligned along a northwest–southeast axis, parallel to the major mountain chains of the Zagros, only to change its direction abruptly where it cuts through these chains in narrow gorges. Along

54-471: Is 3,420 cubic metres (121,000 cu ft) per second. Average annual discharge is 7.2 cubic kilometres (1.7 cu mi). Because of its torrential nature, Medieval Arab geographers have described the Little Zab, and the Great Zab as well, as "demoniacally possessed". The drainage basin of the Little Zab covers 21,475–22,250 square kilometres (8,292–8,591 sq mi); from the location where

81-753: Is a gravel-alluvial fill embankment dam located on Lesser Zab River approximately 130 km upstream from its confluence with the Tigris River. The dam is located directly north of the town of Dibis in Kirkuk Governorate , Iraq . The main-purpose of the Dibis Dam is to divert water from the Lesser Zab River into the Kirkuk Irrigation Project. The Dibis Dam was constructed between 1960 and 1965 as part of

108-579: Is a standard measurement for: Elevation or altitude is generally expressed as " metres above mean sea level" in the metric system , or " feet above mean sea level" in United States customary and imperial units . Common abbreviations in English are: For elevations or altitudes, often just the abbreviation MSL is used, e.g., Mount Everest (8849 m MSL), or the reference to sea level is omitted completely, e.g., Mount Everest (8849 m). Altimetry

135-552: Is listed as Noue aque fl. Above mean sea level Height above mean sea level is a measure of a location's vertical distance ( height , elevation or altitude ) in reference to a vertical datum based on a historic mean sea level . In geodesy , it is formalized as orthometric height . The zero level varies in different countries due to different reference points and historic measurement periods. Climate change and other forces can cause sea levels and elevations to vary over time. Elevation or altitude above sea level

162-650: Is not well known from an archaeological point of view, the available evidence nevertheless shows that the relatively favourable ecological conditions of the Iraqi part of the Zagros attracted human groups from early prehistory onwards. Lower Palaeolithic archaeological sites have to date not been found in the Iraqi part of the Zagros Mountains, but they are known from the Iranian side where numerous cave sites have been found during archaeological surveys. Information on

189-463: Is the measurement of altitude or elevation above sea level. Common techniques are: Accurate measurement of historical mean sea levels is complex. Land mass subsidence (as occurs naturally in some regions) can give the appearance of rising sea levels . Conversely, markings on land masses that are uplifted (due to geological processes) can suggest a relative lowering of mean sea level. Dibis Dam The Dibis (Dibbis) Dam or Dibis Regulator

216-703: The Dukan Dam has been constructed, it measures 11,700 square kilometres (4,500 sq mi). The larger part of the basin (74%) is located within Iraqi borders; the remainder is in Iran. On the north, it is bordered by the Great Zab basin while on the south it is adjoined by the basins of the Adhaim and Diyala rivers. The parallel mountain ranges of the Zagros consist of limestone folds rising to elevations over 3,000 metres (9,800 ft). Water erosion has filled

243-574: The Zarzian culture , which straddles the Upper and Epipalaeolithic periods. After the Zarzian, the focus of human occupation shifted from cave-sites, which continue to be used as secondary or seasonal occupation sites up to today, to open-air sites and it was in this period that the trend toward domestication of plants and animals set in. Domestication of the goat probably occurred first in this area of

270-629: The 116 m (381 ft) tall embankment dam will support a 120 MW power station. Above the Sardasht Dam, Iran is planning to construct the Shivahan and Garjhal Dams with the primary purpose of power generation. Iran has diverted as much as 600,000,000 cubic metres (2.1 × 10 cu ft) of its water in efforts to restore Lake Urmia . This competes with need for the water in Kurdistan Region in Iraq. Although Iraqi Kurdistan

297-657: The Iranian Zagros to less than 200 millimetres (7.9 in) at the confluence with the Tigris near Al Zab . Average temperatures follow a similar gradient, with the mountain valleys generally experiencing colder winters than the foothill zone, while summers in the latter are hotter. In the high Zagros, three different biomes can be distinguished. The tree line is at approximately 1,800 metres (5,900 ft); above which herbs and shrubs predominate. The dominant vegetation between 1,800 and 610 metres (5,910 and 2,000 ft)

SECTION 10

#1732765115143

324-535: The Little Zab in Iraq while Iran is currently constructing one with two others planned. The two in Iraq are the Dukan Dam and the Dibis Dam . The Dukan Dam was constructed between 1957 and 1961 as a multi-purpose arch dam upstream from the town of Dukan. The dam's crest is 116 metres (381 ft) above the riverbed (516 metres (1,693 ft) amsl) and 360 metres (1,180 ft) long. Its functions are to regulate

351-559: The Little Zab valley and the foothill zone south-west of the Zagros with layers of gravel , conglomerate , and sandstone . The Ranya Plain is the largest valley in the Little Zab drainage basin, and the second-largest in the Iraqi Zagros behind the Shahrazor . The Little Zab crosses very diverse climatic and ecological zones. Annual precipitation along the course of the river diminishes from over 1,000 millimetres (39 in) in

378-524: The Zagros confirms the importance of this area to early human hunter-gatherers – including groups of Neanderthals as evidenced by the finds in Shanidar Cave in the Great Zab basin. Mousterian stone tools that were used by either Neanderthals or anatomically modern humans have recently been excavated in Erbil , between the Little Zab and the Great Zab. Both open-air and cave sites are attested for

405-467: The Zagros. Jarmo , a tell east of Kirkuk, was a Neolithic village community that practiced agriculture and animal husbandry. Pottery occurs from the early occupation levels onward; in its later phases it resembles pottery from Hassuna . The early occupation of Tell Shemshara, in the Ranya Plain, can also be dated to this period. The archaeological fieldwork in the Ranya Plain showed that this area

432-410: The affairs of the successive Mesopotamian empires that sought control over the Zagros Mountains. In the early second millennium BCE, king Shamshi-Adad of Upper Mesopotamia waged war to the land of Qabra , which was probably located along the lower course of the Little Zab, and installed garrisons in the conquered towns. The archive of clay tablets found at Tell Shemshara (ancient Shusharra) shows that

459-404: The border between Erbil Governorate and Sulaymaniyah Governorate , and Erbil and Kirkuk Governorates . The river is fed by snowmelt and rainfall, resulting in a peak discharge in the period February–May. Low water levels are recorded for the period July–October. The average discharge of the Little Zab is 197.8 cubic metres (6,990 cu ft) per second, whereas the maximum recorded discharge

486-541: The early prehistory of the wider Little Zab region itself comes from the excavations carried out by the Oriental Institute at archaeological sites east of Kirkuk and south of the Little Zab. The earliest evidence for human occupation in this region comes from the Middle Palaeolithic site of Barda Balka , where Late Acheulean stone tools have been found. Archaeological research elsewhere in

513-805: The fall of the Neo-Assyrian Empire, control of the Zagros shifted first to the Medes and in 550 BCE to the Achaemenid Empire . The last Achaemenid ruler Darius III was defeated by Alexander the Great at the Battle of Gaugamela in northern Iraq and after Alexander's death in 323, the area fell to his Seleucid successors. On the Ortelius Theatrum Orbis Terrarum maps of Turkish Empire and Persian Kingdom it

540-431: The flow of the Little Zab, to store water for irrigation in its reservoir (Lake Dukan) and to provide hydroelectric power. The maximum storage capacity of the dam's reservoir is 6.97 cubic kilometres (1.67 cu mi). Because the flooding of Lake Dukan would lead to the submersion of numerous archaeological sites, an archaeological survey and rescue excavations were carried out in the endangered region – notably at

567-758: The larger Kirkuk Irrigation Project for the irrigation of 300,000 ha of land. The dam has a capacity of 4,000 m through the spillway and 278 m through the head regulator (diversion to the Kirkuk Irrigation Project). Inflow is from Dokan Dam , approximately 140 km upstream. In 1984 the dam failed due to heavy outflows from the Dokan Dam. The fuse-plug that allows the emergency spillway to work did not erode because heavy sediment had built up behind it. Repairs were carried out by China International Water and Electric Cooperation between October 1985 and March 1987. This article about

SECTION 20

#1732765115143

594-700: The largest being the Baneh River and the Qala Chulan. A number of smaller streams joined the Little Zab in the Ranya Plain, which is now partly inundated by Lake Dukan . Different estimates have been given for the length of the Little Zab: 380 kilometres (240 mi), 400 kilometres (250 mi) and 456 kilometres (283 mi). For a short distance, the Little Zab forms the border between Iran and Iraq, and along its lower course it also constitutes

621-553: The local governor switched allegiance and became a vassal of Shamshi-Adad. During the 14th century BCE, the region was part of the Mitannian kingdom, with sites like Nuzi and Tell al-Fakhar , south of the Little Zab, yielding clay tablet archives for this period. During the late second–early first millennia BCE, the lower Little Zab basin belonged to the heartland of the Middle Assyrian and Neo-Assyrian empires. After

648-601: The sites of Tell Shemshara and Tell Bazmusian . The Dibis Dam is located approximately 130 kilometres (81 mi) upstream from the confluence with the Tigris and was constructed between 1960 and 1965. The embankment dam is 376 metres (1,234 ft) long and 23.75 metres (77.9 ft) wide and provides water for the Kirkuk Irrigation Project. Currently under construction in Iran is the Sardasht Dam . Construction began in 2011 and when complete,

675-566: The way, it collects the waters coming down from the eastern face of the Qandil Mountains , which now form the border between Iran and Iraq. The Little Zab enters the Mesopotamian plain south of Dukan, where it first assumes a roughly westward course before turning to the southwest upstream from the town of Altun Kopru and uniting with the Tigris near the town of Al Zab . Most tributaries join the Little Zab upstream from Dukan, with

702-452: Was an open oak forest ( Quercus aegilops ), but not much of this original vegetation remains. The river valleys are characterized by water-loving plants, and marshy areas were in the past – in the absence of drainage – prone to malaria . Although the foothill zone, especially the plain of Erbil, is heavily cultivated, patches of natural vegetation remain, with herbs in the genus Phlomis being very common. Two dams have been constructed on

729-570: Was occupied during the Ubaid , Uruk and Ninevite V periods – roughly from the middle 6th to the mid-3rd millennium BCE. Evidence for these periods comes from the Citadel of Erbil as well. The region enters history at the end of the 3rd millennium BCE, when Erbil is mentioned as Urbilum by king Shulgi of the Ur III dynasty . From that time onward, the Little Zab basin became increasingly entangled in

#142857