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As a modern technique use of plastics in canal lining is that plastic is covered at the top of the canal to prevent dust.

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As a modern technique use of plastics in canal lining is that plastic is covered at the top of the canal to prevent dust.

(a) True

(b) False

The question was asked by my school teacher while I was bunking the class.

My query is from Reports on Estimate for the Construction of Road and Irrigation Channel in chapter Valuation, Reports Technical and Design Data of Civil Engineering Drawing

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Correct answer is (b) False

The best I can explain: The plastic as a material for canal lining offers certain characteristic advantages like negligible weight, easy for handling, spreading and transport, immune to chemical action and speedy construction. The plastic film is spread on the prepared subgrade of the canal. To anchor the membrane on the banks ‘V trenches are provided. The film is then covered with protective soil cover.

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