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Geography Optional 300+ Score Pack · Model answer

“Watershed is the most appropriate spatial unit for planning.” Comment.

  • UPSC 2025
  • Regional Development and Planning

A watershed is a formal region defined by one physical criterion: everything falling inside leaves by one outlet. Runoff, sediment and low flow are internal to it, so externalities an administrative boundary splits are internalised.

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  • The claim rests on a real property: functional closure
  • Where the claim fails
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