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 250a <1,000b <0c <1.25d <1g 0–10e <50 %f
Good 250–750 1,000–2,000 0–2.5 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 >50 %
Harmful 3,000 >6,000 >7.5 >26
  1. 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