Civil Engineering - Water Supply Engineering - Discussion

9. 

The specific retention is least in case of

[A]. Clay
[B]. Sand
[C]. Silt
[D]. Coarse gravel.

Answer: Option D

Explanation:

No answer description available for this question.

Azhar said: (Nov 21, 2013)  
Because of more porosity and voids in the gravel, so water will pass through it quickly without as compare with others.

Muttu said: (Mar 11, 2015)  
The above reason is wrong porosity, and voids are more in case of clay.

Tarkeshwar said: (Nov 19, 2015)  
The Specific Retention (SR) 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.

Bibek Sapkota said: (Feb 11, 2016)  
Voids are more in gravel but porosity is more on clay.

P S Thanveer said: (Feb 13, 2016)  
Specific retention as the word itself says that how much water can be stored in a rock against the gravity. And in coarse gravel the size of voids is so large that it can't store water in it. Therefore the Sr for CG is least and more for clay.

Gopal said: (Jun 13, 2016)  
Well said @Thanveer.

Surya Rao said: (Mar 25, 2017)  
Yes sir, your reason is absolutely correct, thank you @Thanveer.

Shishir said: (Apr 15, 2017)  
Is porosity and permeability are inversely proportional?

Pankaj said: (Sep 29, 2018)  
Clay is the answer here because rack can't retend water.

Amu Bokato said: (Mar 11, 2019)  
Thanks a lot @Thanveer.

Rizu said: (May 11, 2019)  
Porosity and permeability are not inversely promotional. Both are separate concepts.

Monika said: (Sep 20, 2019)  
Thanks @Thanveer.

Rohit Kumar said: (Nov 20, 2020)  
Porosity is a measure of volume of voids. But not big voids (as in case of gravel).

Whereas permeability is the ability of any material to pass fluid from its voids.

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