Chemical Characteristics and Quality Assessment of Groundwater of Exploited Aquifers in Beijiao Water Source of Yinchuan, China: A Case Study for Drinking, Irrigation, and Industrial Purposes

Table 2

Assessment results of osculating values method with entropy and without entropy for the phreatic water samples.

Sample number	OVM with entropy		OVM without entropy
	Osculating value	Rank	Osculating value	Rank
P1	2.43	3	2.17	3
P2	0.29	1	0.48	1
P3	0.4	1	0.58	1
P4	5.29	4	4.95	3
P5	0	1	0	1
P6	1.61	3	1.64	3
P7	1.56	3	1.6	3
P8	0.35	1	0.48	1
P9	3.67	3	3.7	3
P10	1.42	3	1.45	3
P11	2.34	3	2.16	3
P12	0.72	2	0.94	2
P13	1.69	3	0.99	2
P14	1.11	3	2.19	3
P15	3.76	3	3.19	3
P16	4.35	3	4.2	3
P17	2.78	3	2.62	3
P18	1.07	3	1.02	2
P19	3.83	3	3.13	3
P20	3.09	3	2.23	3
P21	2.42	3	2.33	3
P22	1.43	3	1.44	3
P23	2.27	3	1.5	3
S1	0.47		0.73
S2	1.05		1.26
S3	5.13		5.99
S4	13.18		16.06