Blocked drains constitute a primary failure mode in both stormwater and foul-water sewer systems. Annually, municipalities spend an estimated $25 billion globally on reactive clearance operations (World Plumbing Council, 2024). Despite this expenditure, the field remains dominated by heuristic practice rather than evidence-based protocol. This paper aims to: (i) classify common blockage archetypes, (ii) evaluate current clearance technologies against performance metrics, and (iii) propose an integrated decision framework.
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