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the expression “permanent construction” includes roads, bridges, houses, buildings, walls and embankments; 
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the word “road” means any road whether public or private and includes any bridge, pipe, arch, gully, footway, pavement, fence, railing or wall forming part thereof; 
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the word “watercourse” includes rivers, streams and other natural watercourses, and also canals, drains, and other artificial watercourses. 
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