The relationship among specific yield (Sy), specific retention

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The relationship among specific yield (S_y), specific retention (S_r) and porosity (η ) of an aquifer is

1. S_y = S_r + η
2. S_y = S_r – η
3. S_y = η – S_r
4. S_y = S_r + 2η

Correct Option: C

Porosity, h = specific yield + specific retention
= S_y + S_r
∴ S_y = η – S_r.