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Urban wetlands, once routinely drained and paved over during twentieth-century development, are now being deliberately restored or even artificially constructed within cities to manage flooding and improve water quality. These wetlands act as natural filters, trapping sediment and absorbing excess nutrients from runoff before water reaches rivers, while also providing habitat for birds and amphibians within otherwise developed landscapes. Constructed wetlands require careful design, since incorrect water depth or unsuitable plant species can cause the system to fail at filtering pollutants or attract mosquitoes instead of birds. Cities that have invested in wetland restoration report measurable reductions in downstream flooding during heavy rainfall, though maintenance costs, particularly for invasive plant removal, are often underestimated during initial project planning.