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Table 14 Classification of irrigation water according to sodium percent (Wilcox 1955)

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

Water class Sodium percent Specific conductance (EC) (μs/cm) Number of groundwater samples
Excellent < 20 < 250 21
Good 20–40 250–750 93
Permissible 40–60 750–2000 5
Doubtful 60–80 2000–3000 40
Unsuitable > 80 > 3000