Table 5 Classification of water quality for irrigation

From: Assessment of water quality and suitability analysis of River Ganga in Rishikesh, India

Quality	EC range		RSC		KR	SAR	Mg. Hazard
Very good	250^a	<1,000^b	<0^c	<1.25^d	<1^g	0–10^e	<50 %^f
Good	250–750	1,000–2,000	0–2.5	<1.25^d	<1^g	10–18
Marginal	750–2,000	2,000–4,000	2.5–5.0	1.25–2.5	1–2	18–26
Poor	2,000–3,000	4,000–6,000	5.0–7.5	>2.5	>2	18–26	>50 %
Harmful	3,000	>6,000	>7.5	>2.5	>2	>26	>50 %

^a Wilcox 1955; ^b Bhumbla and Abrol 1972; ^c Bishnoi et al. 1984; ^d Eaton 1950; ^e Richards 1954; ^f Paliwal 1972; ^g Kelly 1963

Back to article page