across 319 Monitoring Sites Brian E Haggard Director
![across 319 Monitoring Sites Brian E. Haggard Director, Arkansas Water Resources Center Funding provided across 319 Monitoring Sites Brian E. Haggard Director, Arkansas Water Resources Center Funding provided](https://slidetodoc.com/presentation_image_h2/a7d80a1d9d7790f1daa65e7edf42e708/image-1.jpg)
across 319 Monitoring Sites Brian E. Haggard Director, Arkansas Water Resources Center Funding provided by ANRC
![Identifying Water Quality Trends p The objective of this project is to evaluate changes Identifying Water Quality Trends p The objective of this project is to evaluate changes](http://slidetodoc.com/presentation_image_h2/a7d80a1d9d7790f1daa65e7edf42e708/image-2.jpg)
Identifying Water Quality Trends p The objective of this project is to evaluate changes in water quality, where we can… n n Identify the effects of management actions (e. g. , proper riparian buffers) Identify the effects of new pollutant sources (e. g. , new WWTP)
![The selected sites were from the 319 monitoring program in northwest Arkansas p Upper The selected sites were from the 319 monitoring program in northwest Arkansas p Upper](http://slidetodoc.com/presentation_image_h2/a7d80a1d9d7790f1daa65e7edf42e708/image-3.jpg)
The selected sites were from the 319 monitoring program in northwest Arkansas p Upper Illinois River Watershed n n n p Ballard Creek Osage Creek Illinois River Upper White River Basin n West Fork White River Kings River
![But, evaluating change in water quality is not as simple as looking at the But, evaluating change in water quality is not as simple as looking at the](http://slidetodoc.com/presentation_image_h2/a7d80a1d9d7790f1daa65e7edf42e708/image-4.jpg)
But, evaluating change in water quality is not as simple as looking at the increase or decrease in loads… Illinois River at Arkansas HWY 59
![precipitation and runoff patterns over time… You need to remove the influence of stream precipitation and runoff patterns over time… You need to remove the influence of stream](http://slidetodoc.com/presentation_image_h2/a7d80a1d9d7790f1daa65e7edf42e708/image-5.jpg)
precipitation and runoff patterns over time… You need to remove the influence of stream discharge on loads to identify true trends in water quality.
![Concentrations also change with increasing discharge… You need to remove the influence of stream Concentrations also change with increasing discharge… You need to remove the influence of stream](http://slidetodoc.com/presentation_image_h2/a7d80a1d9d7790f1daa65e7edf42e708/image-6.jpg)
Concentrations also change with increasing discharge… You need to remove the influence of stream discharge on loads to identify true trends in water quality.
![Removing the influence of discharge… A curve is fit to the data that best Removing the influence of discharge… A curve is fit to the data that best](http://slidetodoc.com/presentation_image_h2/a7d80a1d9d7790f1daa65e7edf42e708/image-7.jpg)
Removing the influence of discharge… A curve is fit to the data that best represents how things change with discharge… The next step is to determine the residual.
![adjusted loads or concentrations… Then, we look at how these adjusted values change over adjusted loads or concentrations… Then, we look at how these adjusted values change over](http://slidetodoc.com/presentation_image_h2/a7d80a1d9d7790f1daa65e7edf42e708/image-8.jpg)
adjusted loads or concentrations… Then, we look at how these adjusted values change over time… That’s how we identify trends in water quality.
![concentrations are relative to the line, or expected… er t ea at a r concentrations are relative to the line, or expected… er t ea at a r](http://slidetodoc.com/presentation_image_h2/a7d80a1d9d7790f1daa65e7edf42e708/image-9.jpg)
concentrations are relative to the line, or expected… er t ea at a r g e e ar valu e. s l e u ica arg l va typ isch d se he e n Th n t ive a g th s s e lue r a va e. s e cal arg u l i va typ isch se he n d e Th an t ive th a g at
![The residuals are plotted over time to determine if flow-adjusted values are increasing or The residuals are plotted over time to determine if flow-adjusted values are increasing or](http://slidetodoc.com/presentation_image_h2/a7d80a1d9d7790f1daa65e7edf42e708/image-10.jpg)
The residuals are plotted over time to determine if flow-adjusted values are increasing or decreasing over time…
![the Illinois River at Arkansas HWY 59… Something happened in 2002… the Illinois River at Arkansas HWY 59… Something happened in 2002…](http://slidetodoc.com/presentation_image_h2/a7d80a1d9d7790f1daa65e7edf42e708/image-11.jpg)
the Illinois River at Arkansas HWY 59… Something happened in 2002…
![It’s important to have long term monitoring at sites to know what’s going on… It’s important to have long term monitoring at sites to know what’s going on…](http://slidetodoc.com/presentation_image_h2/a7d80a1d9d7790f1daa65e7edf42e708/image-12.jpg)
It’s important to have long term monitoring at sites to know what’s going on… p You need to have a relatively, consistent monitoring program: n n n Consistency in the number of samples collected Consistency in the parameters analyzed Consistency in the program design We probably need five years of data with consistency…
![Where we are now: p Project extension was granted so that we could include Where we are now: p Project extension was granted so that we could include](http://slidetodoc.com/presentation_image_h2/a7d80a1d9d7790f1daa65e7edf42e708/image-13.jpg)
Where we are now: p Project extension was granted so that we could include data from 2009. p To date, all databases have been compiled, including sampling date, constituent concentration and respective discharge measurements. p Next, we will flow-adjust concentrations and then look at trends over time…
![Take Home Message: Loads are extremely dependent on the variations in discharge, and you Take Home Message: Loads are extremely dependent on the variations in discharge, and you](http://slidetodoc.com/presentation_image_h2/a7d80a1d9d7790f1daa65e7edf42e708/image-14.jpg)
Take Home Message: Loads are extremely dependent on the variations in discharge, and you need to be remove the effects of discharge to evaluate changes in water quality. Questions?
- Slides: 14