English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

In 1991 , the U.S . Geological Survey (USGS) began to implement a full -sca le National Water-Quality Assessment (NA WQA) program . The three major objective of the NA WQA prog ram are to provide a consistent de cription of current water-qua lity condition for a large part of the Nation ' water resources , define long-te rm trends (or lack of trends) in water quality , and identify , de cribe , and explain the major factors that a ffect obse rved waterquality conditions and trends. These objectives will be met by conducting retrospective ana ly e of ex isting data; by establi shing a nati onwide, long-term-monitoring network des igned to assess ex isting water-quality conditions and provide a data ba e for trend analyses; and by conducting proce s-o riented studies designed to provide a better understanding of the relation between landand wate ruse activities and water-quality conditions. The NA WQA program will provide an improved sc ientifi c basis for eva luating the effectivene s of water-quali ty-management program , and fo r pred icting the likely effects of change in landand water-management practices . The A WQA program will be implemented th rough investigations of hydrologic systems in 60 tudy units that include parts of mo t major ri ver basins and aq uifer ys tem in the United States. These investigations wi ll be conducted at the State and local level, and will compri se the foundation on which nat ional and regional assessments will be based . Study units range from I ,200 to about 65 ,000 quare miles in s ize , and incorporate 60 to 70 percent of the at ion' s water u e and population served by public water supply. In 1991 , the ApalachicolaChattahoochee-Flint (ACF) Ri ver was among the first 20 NA WQA study units elected for study under the fu ll -scale implementation plan .

National Water-Quality Assessment Program - The Apalachicola-Chattahoochee Flint River Basin