EPA National Rivers & Streams Assessment 2018-19 Percentage of River & Stream Miles in Fair Condition (2008-09 to 2018-19)

This submission includes publicly available data extracted in its original form. Please reference the Related Publication listed here for source and citation information. If you have questions about the underlying data stored here, please contact the US EPA about the National Aquatic Resource Surveys at https://www.epa.gov/national-aquatic-resource-surveys/forms/contact-us-about-national-aquatic-resource-surveys. If you have questions or recommendations related to this metadata entry and extracted data, please contact the CAFE Data Management team at: [e-mail]. This dataset includes exports from the National Rivers and Streams Assessment Dashboard (https://riverstreamassessment.epa.gov/dashboard/?&view=indicator&studypop=rs&subpop=national&label=none&condition=poor&diff=1v3). For additional raw EPA National Rivers and Streams Assessment Data, see https://riverstreamassessment.epa.gov/webreport/ and https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/S2ZWIE “This dashboard displays results from the National Rivers & Streams Assessment. In order from left to right, the graphs show the percentage of river and stream miles in fair condition in 2018-19, the direction of change, and the change between the 2008-09 to 2018-19 surveys. All confidence intervals are calculated at a 95% confidence level. Condition for nitrogen, phosphorus, and all biological and physical indicators is determined by comparing indicator values to NRSA-specific regional benchmarks. For acidification, salinity, and enterococci, condition is based on national benchmarks. For microcystins and cylindrospermopsin detection indicators, condition depends on whether these chemicals were detected. For all other human health indicators, condition is based on EPA recommended water quality criteria..” [Quote from: https://riverstreamassessment.epa.gov/dashboard/?&view=indicator&studypop=rs&subpop=national&label=none&condition=poor&diff=1v3] U.S. EPA National Rivers & Streams Assessment 2018-19 Percentage of River & Stream Miles in Fair Condition (2008-09 to 2018-19) 2018-19 Estimate and Change Over Time | National本提交内容包含以原始形式提取的公开可用数据。请参考此处列出的相关出版物以获取来源与引用信息。 若您对本存储库中的基础数据存有疑问，请联系美国环境保护署（U.S. Environmental Protection Agency, EPA）国家水生资源调查项目，联系方式为：https://www.epa.gov/national-aquatic-resource-surveys/forms/contact-us-about-national-aquatic-resource-surveys。 若您对本元数据条目及提取数据有疑问或改进建议，请联系CAFE数据管理团队，邮箱地址为：[e-mail]。 本数据集包含来自国家河流与溪流评估仪表板（National Rivers and Streams Assessment Dashboard）的导出数据，访问链接为：https://riverstreamassessment.epa.gov/dashboard/?&view=indicator&studypop=rs&subpop=national&label=none&condition=poor&diff=1v3。如需获取更多美国环境保护署国家河流与溪流评估的原始数据，请访问：https://riverstreamassessment.epa.gov/webreport/ 以及 https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/S2ZWIE。 "本仪表板展示了国家河流与溪流评估（National Rivers and Streams Assessment, NRSA）的结果。图表从左至右依次呈现了2018-2019年处于一般状况的河流与溪流里程占比、变化趋势，以及2008-2009年至2018-2019年两次调查间的变化幅度。所有置信区间均以95%置信水平计算得出。氮、磷及所有生物与物理指标的状况等级，通过将指标值与NRSA专属区域基准值对比确定。酸化、盐度和肠球菌的状况等级基于全国基准值确定。微囊藻毒素与柱孢藻毒素检测指标的状况等级，取决于上述化学物质是否被检出。其余所有人类健康相关指标的状况等级，均依据美国环境保护署推荐的水质标准判定。"[引用来源：https://riverstreamassessment.epa.gov/dashboard/?&view=indicator&studypop=rs&subpop=national&label=none&condition=poor&diff=1v3] 美国环境保护署（EPA）2018-2019年国家河流与溪流评估：2018-2019年一般状况河流与溪流里程占比（2008-2009年至2018-2019年）——2018-2019年估算值与时间变化趋势 | 全国范围