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The entire basin was covered by the monitoring network, composed of the eight monitoring wells (with well depths ranging from 6 to 300 m), which were well designed for the monitoring project in 2013 by the Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences (Figure 3 and Table 1). The length of screen pipes in all monitoring wells varies from 1 to 10 m, and every monitoring well has only one screen pipe rather than multiple screens. The distance between the bottom of the screen pipe and the total well depth ranges from 0 to 3 m in the study area. Special attention was paid to monitoring the dynamic variation of groundwater level at different aquifer units and identifying the potential observation points affected by large-scale groundwater exploitation. All sites were equipped with a data logger (KADEC-MIZU II, Japan) and the groundwater levels were recorded at 30 min intervals from December 2013 to December 2014. In addition, a rain gauge was installed in the basin for the collection of precipitation data.

Table 1

Information of groundwater monitoring wells

No.Longitude (°)Latitude (°)Type of aquiferElevation (m)Well depth (m)
JC01 108.93 39.34 Unconfined 1,335.53 70 
JC02 108.87 39.34 Confined 1,369.19 300 
JC03 109.09 39.30 Confined 1,327.23 150 
JC04 109.04 39.40 Confined 1,338.96 130 
JC05 109.02 39.35 Confined 1,305.33 120 
JC06 109.00 39.26 Unconfined 1,303.58 
JC07 109.00 39.31 Confined 1,303.71 120 
JC08 109.06 39.30 Confined 1,301.40 80 
No.Longitude (°)Latitude (°)Type of aquiferElevation (m)Well depth (m)
JC01 108.93 39.34 Unconfined 1,335.53 70 
JC02 108.87 39.34 Confined 1,369.19 300 
JC03 109.09 39.30 Confined 1,327.23 150 
JC04 109.04 39.40 Confined 1,338.96 130 
JC05 109.02 39.35 Confined 1,305.33 120 
JC06 109.00 39.26 Unconfined 1,303.58 
JC07 109.00 39.31 Confined 1,303.71 120 
JC08 109.06 39.30 Confined 1,301.40 80 

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