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Why do prefabricated band drains become more popular than sand drains?

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There is a trend that sand drains are replaced by prefabricated band drains due to:

(i) The rate of installation of prefabricated band drains is high. As such, substantial cost and time could be saved by using this method of
construction.

(ii) The disturbance of soil during installation of drains is smaller when using prefabricated band drains.

(iii) The ease of fabrication, quality control and storage associated with band drains.

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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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