The Mentioned Above Help to Describe and Identify the Quantity of Water a Contributed by Each Country Sharing the River Basin
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NATURAL FLOW AND HUMAN USE OF THE EUPHRATES RIVER Headwaters of the Khabur Tributary John Kolars Rival claims between Turkey, Syria and Iraq for use of the waters of the Euphrates (and Tigris) River will increase in intensity in the near future as more of the developmental plans of those countries are realized. Before such claims can be arbitrated there must be as complete knowledge as possible of the natural characteristics of the river and its basin made available to all concerned parties. Beyond the physical attributes of the river — some of which will be discussed below — additional information regarding the demography and ethnicity of the populations involved, the history of the area and of the use of its river(s), developments already in place or underway as well as those planned for the future, and the legal, political, and economic issues involved must also be readv at hand. This discussion does not intend to be definitive or complete. Its intent is to outline some critical aspects of one small section of the Euphrates River system. It is hoped by this to indicate the type of continuing research undertaken by the author for the MERI water project. The basic data needed for understanding developments in the basin are the amounts of water available both on the surface and in its aquifers, and on the various withdrawals from these amounts by natural and human subsystems. Such data are usually obtained by records kept at various gauging stations along the length of streams and by well logs. Such records vary in accuracy, timing, and number of years kept. Another important aspect of such records is whether or not the data represent pre- or post- damming periods of flow. Ancillary checks on the accuracy and amounts recorded can be computed — again with varying degrees of accuracy — from catchment areas and climatic records. Soils, underlying lithology (permeability and porousity), vegetative cover, and slope are also important. If amounts of flow can be assigned to specific tributaries this further enhances the overall picture. This last point is the focus of this particular presentation. The mentioned above help to describe and identify the quantity of water A contributed by each country sharing the river basin. In this case the riparian states in question are Turkey which provides most of the waters - 2 - of the Euphrates, Syria which contributes about ten percent of the river's flow, and Iraq which essentially uses but does not contribute to the Euphrates. It should be noted that Saudi Arabia technically shares a small portion of the downstream river basin, but that for all practical purposes neither gives water to nor receives water from the system. Country shares have little correlation with the amounts of water claimed and/or used by riparian states. There is a long record of international river use throughout the world although it is poorly codified. Nevertheless, the case for the legitimacy of downstream as well as upstream users' claims is well established. When water is used for irrigation, domestic use, and industry part of that water will be returned to the system. The amount and quality of the returned water can be significant factors in determining equitable river basin use. Hydroelectric production in theory should not effect downstream users since the water is returned to the system after being passed through the turbines. However, water ponded in reservoirs can be lost through evaporation and seepage and the silt content of rivers can be dramatically altered by settling out in upstream reservoirs. Another important feature of river bsin water use is the amount of water transported and stored in natural underground reservoirs (aquifers). This is of particular interest in the Middle East where surface water losses from evaporation are great. Water held underground remains uneffected by high temperatures and low humidities. On the other hand, the pumping of aquifers can change the flow of surface streams and the return of water to aquifers can pollute as well as restore such supplies. Far less is known about the characteristics, movements and amounts of underground waters then about those on the surface. This presentation will point out the significance of certain aquifers to the Euphrates system. Little will be said here about the legal, historic, and economic events which form the matrix of human use of Euphrates waters. However, in the final analysis, it is in those areas that the most critical decisions have been and will be made. The counties (kaza) in Turkey which fall within the Southeast Anatolia Project (SEAP) are shown on Map I (Figure I). This constitutes the major catchment area for precipitation supplying the Euphrates River. Counties farther east are also important sources of water for the Tigris River. - 3 - Several estimates of the flow of Euphrates waters attribute 88 percent to Turkey and 12 percent to Syria (Garbrecht as quoted in Beaumont, 1978). Al-Khasab using different techniques and sources of data assigns 100 percent of the flow to Turkey (Table 9, 1958). Al-Hadithi using other materials attributes 84 percent of the river's mean annual runoff to Turkey, 13 percent to Syria, and 3 percent to Iraq (1979). (Determining which of these sets of figures is correct will take additional analysis but is discussed below.) One element of importance is the question of the Syrian contribution to the Euphrates' flow into Iraq. This increment comes from three tributaries: the Sadjur which enters from the right bank near the Turkish border, the Balikh (Colap in Turkey) from the left bank farther downstream, and the Khabur midway between the Tabqa Dam and the Iraqi border. Water from these tributaries £omes in part from their catchment areas within Syria, but a major portion of their flow originates in Turkey. The upper reaches of the Khabur constitute a number of smaller streams in Turkey as well as a large aquifer which provides the Khabur in Syria with much of its flow. The materials in this presentation are limited to an examination of the role played by the Khabur and its sources. The "Mardin-Ceylanpinar Irrigation Area' within the Euphrates basin represents the area of Turkey which provides water to the Khabur and which is itself undergoing significant agricultural development within SEAP in Turkey. Such developments will have an important effect on downstream conditions of the Khabur. Put another way, it may well be that of the estimates quoted above, that of Al-Khasab is closest to actual conditions. This, in turn, would mean that Turkey's control over Euphrates waters is nearly total in so far as the geographical location of their sources is concerned. Map II (Figure II) shows the SEAP area in greater detail. The Euphrates River with its existing and proposed reservoirs occupies the western portion of this map. The Tigris River and its existing and proposed reservoirs is in the east. (A portion of Lake Van shows in the northeast. This lake is landlocked and saline and plays no part in the river basin system.) Proposed irrigation developments are shown with the Mardin-Ceylanpinar area found just north of the Syrian border in the central portion of the map. The Colap — and its downstream extension into Syria as the Balikh — is immediately to the west of the Mardin-Ceylanpinar area. A series of tunnels and canals will lead water from an arm of the Ataturk Reservoir in the northwest in a southeasterly direction to both the Colap and the Mardin-Ceylanpinar - 4 irrigation developments. Map III presents additional information about the Mardin-Ceylanpinar project. (It is important to remember that it is this area with its surface streams and underlying aquifers that provides the downstream flow of the Khabur.) The remainder of this discussion will present a review of just how much and in what way this water finds its way into Syria and the Khabur River. The focal point of this map is an area of some 60,000 hectares which will receive water from pumped wells rather than from surface canals. The aquifer tapped by these wells is also the source of water for springs in Syria which feed the Khabur. This irrigation development centers upon Ceylanpinar. Surrounding this area is a much larger one in Turkey in which between 300,000 and 448,000 additional hectares of land will be irrigated with water brought by canals from the Ataturk Reservoir. The impact of this imported water upon the flow and quality of both surface streams and aquifers is problematical. A further point of interest on this map are state farms where crop production from pumped wells is already a fact. Map IV (Figure IV) draws attention to the Syrian role in the physical and economic development of the Khabur River. An area in northeast Syria centering upon the province of Al-Hasakah contains the Syrian headwaters of the Khabur and its tributaries. To the west, the Euphrates River flows across the Turkish border into Syria where it is ponded behind the Tabqa Dam. To the east the Khabur joins the Euphrates near Deir ez Zor. The river then continues to and across the Iraqi-Syrian border. Little water, if any, enters the river downstream from Deir ez Zor with the exception of irregular • floods from usually dry wadis. The headwaters of the Khabur in that portion of Syria known as the Jezireh are shown on Map V. This region is an extension of the north Syrian steppe which is terminated north of the Syrian-Turkish border by the foothills of the Anti-Taurus mountains. The principal feature of this region is the valley of the Khabur which is divided into the High Jezireh just south of the Turkish border and the Low Jezireh which extends as far as the Euphrates River near Deir ez Zor by volcanic highlands to west and east.