What are the disadvantages of using a weir?
Weirs—barriers constructed across rivers to control water flow, measure discharge, or raise upstream water levels—involve several distinct environmental and engineering disadvantages. Ecologically, weirs disrupt natural river continuity, blocking migratory fish pathways, altering sediment transport, and degrading downstream aquatic habitats. Structurally, water plunging over a weir creates dangerous hydraulic rollers and turbulent undercurrents at the base, posing severe drowning hazards for swimmers and boaters. Additionally, weirs are prone to long-term sedimentation buildup behind the barrier, requiring costly dredging operations and ongoing structural maintenance to prevent upstream flooding risks.
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