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Table 1

Classification of surface water on the basis of Na%, SAR, RSC and Salinity Hazard (EC) (μS/cm) (n = 29 summer and monsoon; n = 25 winter)

Parameters	Range	Water class	Summer	Monsoon	Winter
Na%	<20	Excellent	All	All	All
	20–40	Good	Nil	Nil	Nil
	40–60	Permissible	Nil	Nil	Nil
	60–80	Doubtful	Nil	Nil	Nil
SAR	<10	Excellent	All	All	All
	18	Good	Nil	Nil	Nil
	18–26	Doubtful	Nil	Nil	Nil
	>26	Unsuitable	Nil	Nil	Nil
RSC	<1.25	Good	All	All	All
	1.25–2.50	Doubtful	Nil	Nil	Nil
	>2.50	Unsuitable	Nil	Nil	Nil
Salinity Hazard (EC)(μs/cm)	<250	Excellent	S3	M2,M3,M4,M5,M7,M8,M9,M10,M11,M13,M16,M17,M19,M20,M21,M22,M23,M24,M25,M26,M27,M28,M29	J5,J6,J7,J15,J24,J25
	250–750	Good	S1,S2,S4,S5,S6,S7,S8,S9,S10,S11,S12,S13,S14,S15,S17,S18,S19,S20,S21,S22,S23,S24,S25,S26,S27,S28,S29	M1,M6,M12,M14,M15,M18	J1,J2,J3,J4,J8,J9,J10,J11,J12,J13,J14,15,J16,J17,J18,J19,J20,J21,J22,J23
	750–2,000	Permissible	S16	Nil	Nil

Parameters	Range	Water class	Summer	Monsoon	Winter
Na%	<20	Excellent	All	All	All
	20–40	Good	Nil	Nil	Nil
	40–60	Permissible	Nil	Nil	Nil
	60–80	Doubtful	Nil	Nil	Nil
SAR	<10	Excellent	All	All	All
	18	Good	Nil	Nil	Nil
	18–26	Doubtful	Nil	Nil	Nil
	>26	Unsuitable	Nil	Nil	Nil
RSC	<1.25	Good	All	All	All
	1.25–2.50	Doubtful	Nil	Nil	Nil
	>2.50	Unsuitable	Nil	Nil	Nil
Salinity Hazard (EC)(μs/cm)	<250	Excellent	S3	M2,M3,M4,M5,M7,M8,M9,M10,M11,M13,M16,M17,M19,M20,M21,M22,M23,M24,M25,M26,M27,M28,M29	J5,J6,J7,J15,J24,J25
	250–750	Good	S1,S2,S4,S5,S6,S7,S8,S9,S10,S11,S12,S13,S14,S15,S17,S18,S19,S20,S21,S22,S23,S24,S25,S26,S27,S28,S29	M1,M6,M12,M14,M15,M18	J1,J2,J3,J4,J8,J9,J10,J11,J12,J13,J14,15,J16,J17,J18,J19,J20,J21,J22,J23
	750–2,000	Permissible	S16	Nil	Nil