Hydrogeochemical and GIS Analysis of Groundwater Quality for Drinking and Irrigation Purposes in Kuzhithuraiyar Sub-Basin, Kanniyakumari District, Tamil Nadu, India

Table 2

Relative weight of the parameter.

Parameters	Min	Max	Average	STD	WHO standards [25]	Weight	Relative weight
pH	8.5	6.9	7.80	0.32	6.5 to 8.5	5	0.138889
TDS	975	25	213.17	247.09	500–1500	5	0.138889
Ca	104	2	18.38	21.43	75–200	2	0.055556
Mg	43.74	1.215	9.14	8.31	50–150	2	0.055556
Na	230	2	41.90	60.68	200	3	0.083333
K	38	0.1	7.03	7.29	12	2	0.055556
Cl	411	4	64.96	105.40	200–600	3	0.083333
SO4	72	1	11.58	13.63	200–400	4	0.111111
CO3	1.47	0	0.36	0.40	—	1	0.027778
HCO3	317.2	4.98	66.23	65.03	300–600	3	0.083333
NO3	23	0.1	4.98	5.20	50	2	0.055556
F	0.76	0.05	0.20	0.15	1.2	4	0.111111