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Table 10 Classification of irrigation water based on salinity (EC) and (SAR) values; College of Agricultural Sciences (2002) and U.S. Salinity Laboratory Staff (1954)

From: GIS-based assessment of groundwater quality and suitability for drinking and irrigation purposes in the outlet and central parts of Wadi El-Assiuti, Assiut Governorate, Egypt

Class EC TDS (ppm) SAR Order Suitability
Excellent 0–250 < 200 < 10 Low Suitable
Good 250–750 200–500 10–18 Medium Moderately suitable
Fair 750–2250 500–1500 18–26 High Fairly suitable
Poor 2250–5000 1500–3000 > 26 Very high Unsuitable