Evaluating Spatiotemporal Variation of Groundwater Depth/Level in Beijing Plain, a Groundwater-Fed Area from 2001 to 2010

Table 3

Variation of groundwater level at monitoring station.

Threshold	Difference level	Number of stations	Percentage
<0		16	15.24%
0~5		31	29.52%
5~10		18	17.14%
10~15		20	19.05%
15~20		5	4.76%
20~25		6	5.71%
25~30		9	8.57%