Specific yield (Sy) is the fraction of water in an aquifer that drains freely under gravity, while specific retention (Sr) is the fraction retained against gravity by molecular/surface tension forces in pore spaces. These two together sum to the total porosity: Porosity = Specific Yield + Specific Retention.
Given porosity = 25% and specific retention = 10%, specific yield = porosity − specific retention = 25% − 10% = 15%. This is the...
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