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Four control sites were selected on the basis of such considerations as their administrative boundaries, irrigated areas and the catchments’ properties (Figure 9), information that came from the Statistical Yearbook of Gansu Province (Table 5). In addition, the industrial water requirement, which represents a small proportion of water use (less than 1%), is set as 0 in this case study.
Table 5

Detailed information of each control site in the Heihe River basin

Control siteCountiesPopulation (104)U (m3/day)Red (%)Crop type*Efa (%)
Qilian 5.02 0.18 25 0.55 
Minle, Shandan 83.71 0.2 30 0.55 
Zhangye 27.88 0.2 30 0.55 
Linze, Gaotai 42.38 0.18 25 0.55 
Control siteCountiesPopulation (104)U (m3/day)Red (%)Crop type*Efa (%)
Qilian 5.02 0.18 25 0.55 
Minle, Shandan 83.71 0.2 30 0.55 
Zhangye 27.88 0.2 30 0.55 
Linze, Gaotai 42.38 0.18 25 0.55 

*Crop types 1 and 2 mean the major crop types of wheat and maize, respectively.

Figure 9

Division of the irrigated area by the control site method (values of 1, 2, 3, 4 and 5 represent the irrigated area of Qilian, Minle & Shandan, Zhangye, Linze & Gaotai, and Jiuquan, respectively).

Figure 9

Division of the irrigated area by the control site method (values of 1, 2, 3, 4 and 5 represent the irrigated area of Qilian, Minle & Shandan, Zhangye, Linze & Gaotai, and Jiuquan, respectively).

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