![]() An increasing number of cities in the United States and Canada have devised comprehensive plans to incorporate these methods into their overall wastewater management strategies. ![]() A new strategy has emerged during the past few decades that focuses on absorbing, infiltrating and detaining stormwater to reduce peak flows and filter out nonpoint source pollution, thereby addressing CSOs, stormwater runoff pollution and flooding at the same time. In the absence of treatment, discharges from separated sewer/stormwater outfalls are also very damaging to aquatic environments as they typically carry numerous nonpoint source pollutants and alter the delicate geomorphology of natural watercourses. The separation of stormwater from the sewage waste stream has been implemented in many cities to minimize combined sewer overflows (CSOs) during periods of heavy rain.
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