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Most settlements develop around natural drainage channels. When such channels are narrowed, concretised, covered, blocked by construction or filled with waste, rainfall loses its natural route to larger water bodies.
The consequence is localised waterlogging. This is why desilting alone cannot solve urban flooding.
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Exam map
Syllabus & Relevance
Paper: GS-2
Theme: Polity & Governance
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Static Foundation
A drain may be perfectly clean but still inadequate if its original floodplain or downstream outlet has been encroached.
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Answer Framework
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