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

Table 2

Results of Mann-Kendall test of groundwater depth/level.

	Kendall’s tau		value (two-tailed)
Groundwater depth	1	45	8.31e − 05	0.05
Groundwater level	−1	−45	8.30e − 05	0.05