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In reclamation works what are the importance of geotextiles and sand?


The primary purposes of geotextiles and sand in reclamation works are as follows:
☛ Geotextiles: They are used to separate the marine mud from the reclamation fill. Also geotextiles are used as reinforcements in reclamation processes to increase its stability. It is still debated as to whether the usage of geotextiles is better or are the old processes followed are better as the performance has not been comparable to the conventional methods.
☛ Sand: In reclamation process sand is used to spread the load of any future public dumps placed on top of it. Sand also acts as a drainage for the excess pore water pressure of band drain installations.

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Please explain why concrete barriers have curved surface profiles?As current travels within a conductor:
A. the magnetic field aids the current
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C. the wire tries to point north
D. an electrostatic field opposes the current