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Amendment of section 4 of Principal Act.
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3.—Section 4 of the Principal Act is hereby amended by the substitution of the following subsection for subsection (1):
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“(1) Whenever the Commissioners are of opinion that the execution of arterial drainage works is expedient in respect of—
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(a) any catchment area for the purpose of preventing or substantially reducing the periodical flooding of lands in that area or of improving by drainage lands in that area, or
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(b) any watercourse or any part of a watercourse for the purpose of preventing or substantially reducing the periodical flooding of lands in the area of that watercourse or such a part or of improving by drainage lands in that area,
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it shall be lawful for the Commissioners to prepare a scheme (in this Act referred to as a drainage scheme) for the execution of such works and for that purpose to make such engineering, environmental, valuation and other surveys of the said area as shall appear to them to be necessary or expedient.”.
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