Suchergebnisse

"The Quality of Our Nation's Waters, which describes major findings of the NAWQA Project on water-quality issues of regional and national concern and provides science-based information for assessing and managing the quality of our groundwater resources"--Provided by publisher

"Excess nutrients are a pervasive problem of streams, lakes, and coastal waters. The current report, "The Quality of our Nation's Waters--Understanding the Effects of Nutrients on Stream Ecosystems in Agricultural Landscapes," presents a summary of results from USGS investigations conducted from 2003 to 2011 on processes that influence nutrients and how nutrient enrichment can alter biological components of agricultural streams. This study included collecting data from 232 sites distributed among eight study areas. This report summarizes findings on processes that influence nutrients and how nutrient enrichment can alter biological communities in agricultural streams. These findings are relevant to local, state, regional, and national decision-makers involved in efforts to (1) better understand the influence of nutrients on agricultural streams, (2) develop nutrient criteria for streams and rivers, (3) reduce nutrients to streams and downstream receiving waters, and (4) develop tools for tracking nutrient and biological conditions following nutrient reduction strategies. All NAWQA reports are available online at https://water.usgs.gov/nawqa/bib/" --Provided by publisher

Overview of major findings and implications -- NAWQA approach to assessing groundwater quality -- Environmental and hydrogeologic setting -- Natural processes and human activities that affect groundwater quality -- Quality of the groundwater resource used for drinking -- Understanding where and why key contaminants occur in groundwater.