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In coarse gravels, specific retention is: _____.
1. More
2. Less
3. Moderate
4. More or less

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Correct Answer - Option 2 : Less

Specific Retention (Sr):

Specific retention of a rock or soil is the ratio of the volume of water a rock can retain against gravity to the total volume of the rock.

\(\left( {{S_R}} \right) = \frac{{{Volume\;of\;water\;retain\;against\;gravity\;(V_{RG})}}}{Volume\;of\;soil} \times 100\)

In coarse gravels, the size of the pores is large, due to the large size of pores, water holding capacity against gravity will be less. Hence the specific retention will also be less.

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