Lake Erie is located in North America with its southern shoreline bordering Ohio, as well as parts of Michigan, Pennsylvania and New York. A one-year study investigated nutrient pollution in a Central Basin Lake Erie headwater tributary watershed near Cleveland Ohio. Results suggest that the 2019 annual phosphorus load entering Lake Erie from the Euclid Creek watershed was approximately 22,600 pounds, over four times the watershed’s target of 5545 pounds. Multiple upstream sites were the major nonpoint sources of nutrient pollution. Four sampling sites averaged phosphorus levels 12–15 times the watershed target of 0.05 mg/L. Leaking sanitary sewers in residential areas were believed to contribute more pollution than the three golf courses and the regional airport located within the watershed. The presence of the Cleveland Metroparks along the riparian corridor in the Main Branch significantly reduced (p < 0.05) nutrients during dry weather. In particular, stream restoration within the Acacia Reservation lowered phosphorus levels by an average 0.31 mg/L. Spring storms contributed the most to the annual phosphorus load (∼47 %). To mitigate nutrient pollution in urban watersheds, best management practices (BMPs) would require a two-fold strategy. During dry weather, BMPs should incorporate stream restoration and forested riparian buffers where feasible. Green infrastructure should be designed to mitigate the impact of wet-weather storm-induced flows.

伊利湖位于北美洲，其南部海岸线与俄亥俄州以及密歇根州、宾夕法尼亚州和纽约州的部分地区接壤。一项为期一年的研究调查了俄亥俄州克利夫兰附近的中央盆地伊利湖源头支流流域的营养物污染。结果表明，从 Euclid Creek 流域进入伊利湖的 2019 年磷负荷约为 22,600 磅，是该流域目标 5545 磅的四倍多。多个上游站点是营养物污染的主要面源。四个采样点的平均磷水平是流域目标 0.05 毫克/升的 12-15 倍。居民区下水道泄漏被认为比位于流域内的三个高尔夫球场和区域机场造成更多污染。克利夫兰城市公园沿着主要分支的河岸走廊的存在显着减少（p < 0.05）干燥天气期间的营养物质。特别是，金合欢保护区内的河流恢复使磷水平平均降低了 0.31 毫克/升。春季风暴对年磷负荷的贡献最大（~47%）。为了减轻城市流域的养分污染，最佳管理实践 (BMP) 需要双重策略。在干燥天气期间，BMP 应在可行的情况下纳入河流恢复和森林河岸缓冲区。绿色基础设施的设计应减轻潮湿天气风暴引起的水流的影响。金合欢保护区内的河流恢复使磷水平平均降低了 0.31 毫克/升。春季风暴对年磷负荷的贡献最大（~47%）。为了减轻城市流域的养分污染，最佳管理实践 (BMP) 需要双重策略。在干燥天气期间，BMP 应在可行的情况下纳入河流恢复和森林河岸缓冲区。绿色基础设施的设计应减轻潮湿天气风暴引起的水流的影响。金合欢保护区内的河流恢复使磷水平平均降低了 0.31 毫克/升。春季风暴对年磷负荷的贡献最大（~47%）。为了减轻城市流域的养分污染，最佳管理实践 (BMP) 需要双重策略。在干燥天气期间，BMP 应在可行的情况下纳入河流恢复和森林河岸缓冲区。绿色基础设施的设计应减轻潮湿天气风暴引起的水流的影响。