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    Question

    In tile drainage, when the tiles arranged from one side

    only it is known as
    A Random system Correct Answer Incorrect Answer
    B Natural system Correct Answer Incorrect Answer
    C Herring bone system Correct Answer Incorrect Answer
    D Gridiron system Correct Answer Incorrect Answer

    Solution

    The gridiron system is similar to the herringbone system except that the laterals enter the main only from one side.

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