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Concrete mixture (Cement: Sand: Gravel or broken stone) usually recommended for lining of canals is:
EXPLANATION
Storage Entomology & Grain Fumigation
- Concrete Mix Ratios for Canal Lining:
- In agricultural water conveyance, cement concrete lining reduces seepage losses and prevents weed growth.
- The Bureau of Indian Standards (IS: 3873) recommends nominal mix proportions for canal bed and side linings of 1:3:4 or 1:3:5 (Cement : Sand : Coarse Aggregate).
- 3:4 provides optimal impermeability and tensile resistance against hydrostatic backpressure.
- Conclusion: 1:3:4 (Option 4).
Correct option: (4) 1:3:4
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