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

Table 1

Variables selected from the Beijing Water System.

Number	Variables	Unit	Symbols	Data series
1	Inflow	10E08 m^3	Qin	2001–2010
2	Outflow	10E08 m^3	Qout	2001–2010
3	Surface water resources	10E08 m^3	SWR	2001–2010
4	Groundwater resources	10E08 m^3	GWR	2001–2010
5	Precipitation	10E08 m^3	Pa	2001–2010
6	Agricultural water use	10E08 m^3	AWU	2001–2010
7	Industrial water use	10E08 m^3	IWU	2001–2010
8	Domestic water use	10E08 m^3	DWU	2001–2010
9	Environmental water use	10E08 m^3	EWU	2001–2010
10	Groundwater depth/level	m	GWD	2001–2010