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Water reservoirs and discharge relevant transfers

The Guanting Reservoir is located on the Yongding River, at the border of Beijing Municipality and Hebei Province, at the eastern side of the catchment area Guanting. The Sanggan River and the Yang River join to the Yongding River at the upstream end of the reservoir.The Guanting Reservoir is the second largest reservoir and one of the major water source of Beijing.

Besides the Guanting Reservoir, two large reservoirs, the Cetian Reservoir and Youyi Reservoir are within the catchment area. The Cetian reservoir diverts some million cubic metres of water into the Guanting reservoir. Without this diversion the Guanting reservoir would have the tendency to dry out.

Furthermore, 265 smaller reservoirs are located in the investigation area and a lot of small storages mainly for irrigation purposes alter the discharge fluctuation from the basin. All these reservoirs are located in elevations from 480 until 1400 metres above datum.

A huge share of the discharge evaporates from the surface of the reservoirs due to the semi-arid climate and its exposed position (evapotranspiration can be up to 89 % of the precipitation). Besides, the discharge is more and more decreased by the increasing demand of the two industrial cities Zhangjiakou and Datong located in the upstream region (Spyra & Jacob 2004).

Major water transport projects from Yangtze River and Yellow River have been planed and built to divert water from the south of China to the dry north.

The South-North Water Transfer Project settles on three different proposals for routes: The western route is in the western headwaters of the rivers where Yangtze River and Yellow River are closest to one another. It is intended to transfer water from Qinghai-Tibetan Plateau to the upstream of Yellow River, and consists of three phases with a maximum transferable water quantity of 17 billion m3. The central route is from the upper reaches of the Han River (a tributary of Yangtze River) to Beijing and Tianjin; and the eastern route using the course of the Grand Canal. The Eastern Route and the Central Route are under construction, with a length of 1,890km and 1,427km, respectively. (The Economist, October 11th, 2008, p. 61).

However, these projects do not divert water into the Guanting catchment and consequently will only indirectly influence the discharge regime of the study catchment.

(source: Wechsung, project proposal, revised by DHI WASY July 2010)

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