Multiple choice

The relationship among specific yield (Sy), specific retention (Sr) and porosity ($\eta$) of an aquifer is

  1. Sy = Sr + $\eta$
  2. Sy = Sr – $\eta$
  3. Sy = $\eta$– Sr
  4. Sy = Sr + 2$\eta$
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C Correct answer
Explanation

 $\eta = \text{porosity of an aquifer}\\ \hspace{0.2cm} = \text{specific yield + specific retention}\\ \hspace{0.2cm} = S_y + S_r\\ S_y = \eta - S_r$

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