Computer · Geotechnical Engineering
Select the incorrect statement from the following pertaining to the design of a graded filter for drainage structures:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1To avoid segregation, the filter should contain particles of size larger than 75 mm.✓
- 2For proper working, the filter material should not contain more than 5% of fines passing 75-micron IS sieve.
- 3The material of the last layer should be coarse enough not to be carried away through the openings of the perforated pipes.
- 4None of the above statements is incorrect.
Correct answer
To avoid segregation, the filter should contain particles of size larger than 75 mm.
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