Temporal Aspects of Surface Water Quality Variation Using Robust Statistical Tools

Table 1

Descriptive statistics of physicochemical parameters under study in mg/L except temperature, conductivity, and pH.

Parameters	Dry season					Wet season
	Mean	SD	Variance	Skewness	Kurtosis	Mean	SD	Variance	Skewness	Kurtosis
DO	0.72	0.19	0.04	−2.50	7.08	0.41	0.24	0.06	−0.37	0.28
BOD5	0.22	0.33	0.11	1.59	2.76	0.61	0.29	0.09	1.20	2.89
COD	1.33	0.17	0.03	1.39	1.25	1.65	0.18	0.03	0.44	0.75
SS	1.25	0.32	0.10	−0.93	2.69	1.70	0.53	0.28	0.67	−0.13
pH	6.67	0.03	0.00	0.17	−0.44	7.14	0.02	0.00	−0.47	1.25
NH3	−0.56	0.74	0.54	0.06	−1.03	0.46	0.32	0.10	−1.65	5.20
Temperature	28.0	0.02	0.00	−0.42	−0.33	29.5	0.02	0.00	−0.14	0.29
Conductivity	1.96	0.71	0.51	1.85	2.84	4.10	0.47	0.22	−1.99	4.65
Salinity	−1.30	0.79	0.62	1.56	1.61	0.85	0.50	0.25	−1.99	4.62
Turbidity	1.36	0.30	0.09	−0.24	0.93	1.66	0.53	0.28	0.76	0.05
DS	1.54	0.69	0.48	1.78	2.97	3.87	0.47	0.22	−1.97	4.63
TS	1.74	0.44	0.19	2.06	5.19	3.89	0.42	0.17	−1.64	3.25
NO3	−0.70	0.45	0.20	−1.56	2.06	1.16	0.08	0.01	0.19	−0.57
Cl	0.42	0.38	0.15	0.74	−0.09	3.59	0.53	0.28	−2.39	6.52
PO4	−1.08	0.97	0.94	0.45	−1.42	1.44	0.09	0.01	−0.45	0.75