scholarly journals Physical and chemical water-quality data and nitrogen and phosphorus yields for 29 sites sampled in two synoptic surveys of streams within the Lewisville Lake watershed are presented in this report. The two synoptic surveys were conducted in March 1984 and March 1985, as a reconnaissance and assessment of water quality and nitrogen and phosphorus yields throughout the watershed. This work was cooperatively funded by the city of Dallas and the U.S. Geological Survey (USGS) as part of a hydrologic study to quantify nonpoint nutrient loads to Lewisville Lake.

1989 ◽  
Author(s):  
W. Scott Gain
Keyword(s):  
Water Quality ◽  
Geological Survey ◽  
Quality Data ◽  
Nutrient Loads ◽  
Nitrogen And Phosphorus ◽  
Water Quality Data ◽  
Physical And Chemical ◽  
The City ◽  
Chemical Water ◽  
The U.S

Using Authentic Environmental Data to Enhance Biology Understanding

2015 ◽  
Vol 77 (9) ◽  
pp. 703-706
Author(s):  
William Kroen
Keyword(s):  
Water Quality ◽  
Environmental Data ◽  
Quality Data ◽  
Weather Data ◽  
Data Sets ◽  
Water Quality Data ◽  
Local Sources ◽  
Physical And Chemical ◽  
Chemical Water ◽  
Biological Organisms

Scientists often integrate measurements and data from various sources to ask questions and perform investigations. The exercises described here allow students to think critically and understand concepts that affect biological organisms as they make hypotheses about a selected stream or river, then graph, analyze, and interpret physical and chemical water-quality data (and possibly weather data) from local sources. Details on how to access, download, and manage data sets are provided.

Post-fire water-quality response in the western United States

2018 ◽  
Vol 27 (3) ◽  
pp. 203 ◽  
Author(s):  
Ashley J. Rust ◽  
Terri S. Hogue ◽  
Samuel Saxe ◽  
John McCray
Keyword(s):  
United States ◽  
Water Quality ◽  
Stream Water ◽  
Western United States ◽  
Change Point Analysis ◽  
Quality Data ◽  
Stream Water Quality ◽  
Nitrogen And Phosphorus ◽  
Water Quality Data ◽  
Quality Response

Wildfires are increasing in size and severity in forested landscapes across the Western United States. Not only do fires alter land surfaces, but they also affect the surface water quality in downstream systems. Previous studies of individual fires have observed an increase in various forms of nutrients, ions, sediments and metals in stream water for different post-fire time periods. In this research, data were compiled for over 24 000 fires across the western United States to evaluate post-fire water-quality response. The database included millions of water-quality data points downstream of these fires, and was synthesised along with geophysical data from each burned watershed. Data from 159 fires in 153 burned watersheds were used to identify common water-quality response during the first 5 years after a fire. Within this large dataset, a subset of seven fires was examined further to identify trends in water-quality response. Change-point analysis was used to identify moments in the post-fire water-quality data where significant shifts in analyte concentrations occurred. Evaluating individual fires revealed strong initial increases or decreases in concentrations, depending on the analyte, that are masked when averaged over 5 years. Evidence from this analysis shows significant increases in nutrient flux (different forms of nitrogen and phosphorus), major-ion flux and metal concentrations are the most common changes in stream water quality within the first 5 years after fire. Dissolved constituents of ions and metals tended to decrease in concentration 5 years after fire whereas particulate matter concentration continued to increase. Assembling this unique and extensive dataset provided the opportunity to determine the most common post-fire water-quality changes in the large and diverse Western USA. Results from this study could inform studies in other parts of the world, will help parameterise and validate post-fire water-quality models, and assist communities affected by wildfire to anticipate changes to their water quality.

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