Table 8.

Water quality index values for surface waters of the Orós reservoir

Collection	P1	P2	P3	P4	P5	P6	P7	Avg.	C.V.
August 2009	61.49	59.08	57.71	59.98	61.09	65.55	62.22	61.02	4.12
October 2009	56.70	54.18	55.43	62.62	65.85	67.38	67.95	61.44	9.63
December 2009	55.68	41.21	52.94	63.31	65.40	64.06	65.57	58.31	15.49
February 2010	57.48	43.89	58.98	58.85	57.11	64.69	51.6	56.08	11.78
April 2010	56.85	52.67	55.99	67.02	65.58	63.68	68.09	61.41	9.98
June 2010	47.03	50.15	48.56	41.24	44.97	53.68	60.85	49.50	12.84
September 2010	52.64	55.00	51.84	64.64	60.69	65.80	79.94	61.51	16.03
January 2011	47.15	51.00	48.89	61.09	52.46	69.12	72.73	57.49	17.80
March 2011	58.92	42.29	55.88	62.10	61.48	65.33	62.96	58.42	13.22
Average	54.88	49.94	54.02	60.09	59.40	64.37	65.76
C.V.	9.13	12.40	6.85	12.44	11.70	6.75	12.08

C.V. Coefficient of Variation