Impacts of Groundwater Recharge from Rubber Dams on the Hydrogeological Environment in Luoyang Basin, China

Table 4

Each index of annual average concentration before and after the rubber dams construction.

Well number		B1	B2	B3	B4	B5	B9	B6	B7	B8
pH	Average of 1989 to 2000	7.32	7.47	7.26	7.33	7.54	7.32	7.46	7.32	7.42
	Average of 2001 to 2012	7.35	7.43	7.21	7.46	7.49	7.37	7.38	7.30	7.41
	Difference	0.03	−0.04	−0.05	0.12	−0.05	0.05	−0.07	−0.02	−0.01
TH (mg/L)	Average of 1989 to 2000	482.9	332.6	484.5	370.5	280.9	298.1	349.8	580.6	348.9
	Average of 2001 to 2012	273.1	234.5	320.0	174.9	206.0	164.4	393.9	700.8	383.6
	Difference	−209.8	−98.2	−164.5	−195.6	−75.0	−133.7	44.1	120.1	34.7
TDS (mg/L)	Average of 1989 to 2000	646.6	456.8	611.6	462.0	380.9	443.8	447.6	719.5	456.1
	Average of 2001 to 2012	402.0	348.4	428.1	292.3	331.1	298.9	519.1	897.8	528.4
	Difference	−244.6	−108.4	−183.5	−169.7	−49.8	−145.0	71.5	178.3	72.3
NO3-N (mg/L)	Average of 1989 to 2000	22.8	10.1	13.0	8.5	6.9	10.6	9.8	9.7	9.3
	Average of 2001 to 2012	8.7	9.2	7.8	5.9	6.7	5.9	14.5	16.7	14.5
	Difference	−14.0	−0.9	−5.2	−2.5	−0.2	−4.7	4.6	6.9	5.2
NH4-N (mg/L)	Average of 1989 to 2000	0.02	0.01	0.00	0.01	0.01	0.01	0.01	0.01	0.01
	Average of 2001 to 2012	0.03	0.04	0.03	0.08	0.08	0.06	0.01	0.01	0.01
	Difference	0.01	0.03	0.03	0.07	0.07	0.05	0.00	0.01	0.00