Top Research Papers on Water Quality

2275 Speedway, C9000 | Austin, TX 78712 | 512.232.4558 | esi.utexas.edu Lesson Plan for Grades: 11th-12th grades (due to sensitive topic, lesson plan materials/video resource should be viewed only by the teacher and used appropriately to maintain a safe learning environment) Length of Lesson: Two 45-minute class days (Day 1: 45 minutes, not including ~20 mins time needed to leave the classroom and go to nearby pond, etc.; Day 2: 45 mins) Authored by: UT Environmental Science Institute Date created: 5/2/19 Subject area/course: ● Biology II ● Environmental Science (main focus area) Materials: ● ...

information available, the public has become more aware of a seemingly endless series of crises and dire forebodings. It is only natural to expect that in order to preserve our collective sanity, we have closed our minds to all but the most relevant items in our immediate surroundings. But even on this level of priority, the environment is making its message felt. Countless numbers of charts and graphs and physical, chemical, and biological indices could be reviewed here, but none of these items is as effective in bringing the pollution message home to individuals as the sign at the beach that...

As much as 3.0 million acre-feet of Colorado River water are used every year to irrigate more than 500,000 acres of lands in the Imperial Valley. Surface and subsurface drainage water from irrigated fields enters the Salton Sea which serves as a drainage sink for the Imperial and Coachella Valleys since its formation in 1905. The Salton Sea continues to exist because of the drainage water from agriculture in Imperial and Coachella Valleys as well as flow from agricultural drainage and untreated and partially treated wastewater from the Mexicali Valley. The salinity of the Sea is over 46,000 pp...

For 30 years, I have received questions about the quality of water that should be used for removal of coatings. How much dissolved material or minerals gets left on the surface? Just recently after an hour lon webinar to 200 people, the questions was “What shoul the quality of the water be?” Among the first comments which I received on the WJ standards documents came from Singapore: The complaint was that we didn’t advocate cleaning with brackish or filtered seawater.” Just recently in 2015, a Sherwin Williams representative talked about the methodology in Brazil where WJ was being used for pr...

The fluids that leak or drip from your automobile eventually end up in our rivers, lakes, and streams. Did you know that even though your home may be miles away from a lake or a river, the chemicals that spill on your driveway or parking lot find their way to our local waterways? The mid‐Michigan area is home to three separate watersheds: the Grand River, Red Cedar River, and Looking Glass River Watersheds. The rainwater, soiled water from washing your car, and any toxic chemicals which are allowed to enter drainage ditches and storm sewers end up flowing into these watersheds. Keeping hazardo...

Work now underway on the development of a water quality predictive model for highway drainage design is preparing the ground for a time when the quality of water discharged from U.K. highway drains will have to meet certain standards before being allowed into the sewerage network. This article examines the far-reaching consequences of this new model's application.

Water is an excellent solvent that can dissolve many elements. The amount of each element affects water quality, reflected in the chemical, physical, or biological condition of water. Therefore, water quality is often measured with what is contained in water, such as dissolved oxygen, suspended solids, pesticides, metals, oils, minerals, and nutrients. Pathogenic bacteria might affect human and animal health and so they are often measured. Physical conditions are another set of water quality measurement, such as water temperature, water color, and turbidity. Water quality also can be assessed ...

Author(s): Hall, Terry | Abstract: This is fact sheet 5.2 in the Farm Water Quality Planning series.

The Texas Commission on Environmental Quality (TCEQ) evaluates the condition of the state’s water bodies on a periodic basis under the Clean Water Act (CWA) Section 305(b). The results are contained within the Texas Water Quality Inventory and 303(d) List and are comprised of a complete listing of all water quality concerns in the state. As required by the Act, the inventory is updated every two years and includes the review of the past five years’ data collected by many organizations statewide, including the BRA. The 2006 Water Quality Inventory and 303(d) List, on which the following informa...

On the one hand the water quality field is increasingly diverse and complex, on the other hand there is an increasing demand from the public, water managers and all stakeholders for simplified water quality indicators integrated over time and space, and appropriate to specific issues. The evolution of water quality is also of concern at the global scale (Vorosmarty and Meybeck, 2004). Questions raised by this evolution are presented here in the hope of opening a forum on this topic.

Impairment of numerous water resources by anthropogenic stress has caused degradation, which reduces their ecological integrity, a combination of physicochemical and biological integrity. Techniques to assess impairment may be broadly divided into physicochemical, biological, and habitat assessments. Most physicochemical analyses are conducted in the laboratory. Biological techniques are divided into field measurements such as population and community level approaches using indigenous organisms as indicators of stress and laboratory measurements such as toxicology, which generally use field co...

In thinking of the quality of a water, it is natural to think first of its potability or sanitary quality, then of its physical attractiveness and finally of its suitability for steam making and other industrial uses. In certain cases the suitability for industrial use takes precedence, but when considering a water supply for a community, choice is commonly determined by the potability and attractiveness, assuming that all sources under consideration can yield a sufficient quantity of water to supply the needs of the community in question, and that the cost of supplying water from the differen...

This POSTnote describes the basis of current standards and highlights some of the issues relating to the provision of safe drinking water

We continue to invest in improvements to safeguard drinking water quality. Compliance with drinking water standards continues to be high - our overall compliance in 2015 was 99.96%.

State regulations require water utilities to provide a minimum of 20 pounds per square inch (PSI) water pressure at the point of delivery under normal flow conditions. Abnormal conditions such as water main breaks can substantially reduce pressure or even cause an outage. For systems that cannot maintain minimum pressure, a number of things might need to be considered to improve pressure; this could include booster pumps for certain areas, increased water main size, and taller storage tanks. Discoloration is most often caused by sediments that normally accumulate in water mains. “Flushing” the...

Green Roofs can be very effective as method for improving water quality. A recent study in Charlotte, North Carolina, showed that in addition to heavy metal pollutants, 10-30 percent of nitrogen and phosphorus pollutants contributed to streams and lakes are derived from runoff from urban roofs. These pollutants are the principal culprits in degrading aquatic habitat. Dust containing a range of pollutants accumulates on roofs until it is washed off with next rainfall. Furthermore, the acidity of runoff from roofs is typically higher than already acidic rainfall.

Water quality can affect human health in various ways: through breeding of vectors, presence of pathogenic protozoa, helminths, bacteria and viruses, or through inorganic and organic chemicals. While traditional concern has been with pathogens and gastro-intestinal diseases, chemical pollutants in drinking-water supplies have in many instances reached proportions which affect human health, especially in cases of chronic exposure. Treatment of drinking-water, often grossly inadequate in developing countries, is the last barrier of health protection, but control at source is more effective for p...

This information was presented at the 2012 Cornell Nutrition Conference for Feed Manufacturers, organized by the Department of Animal Science in the College of Agriculture and Life Sciences at Cornell University. Softcover copies of the entire conference proceedings may be purchased at http://www.ansci.cornell.edu/dm/proceedings_orders.html or by calling (607)255-4285.

28-Jun 6-Mar 23-Apr 20-Apr 17-May 22-May 26-May 11-May Units CDWG *2000 *2001 *2002 *2003 *2004 *2005 *2006 *2007 *2008 *2009 Total Ammonia (N) mg/L Color-Apparent CU ≤15 AO 15 3 2 2 5 <5 <5 8 <5 <5 Conductivity uS MAC 291 137 128 175 159 163.1 148.3 163.7 151 157.9 TDS mg/L 500 AO 211 87 53 53 93 53 93 86 104 116 Hardness (CaCO3) mg/L 80-100 AO 88 55.3 55.2 58.4 64 68 58 73 53 67 pH pH units 6.5-8.5 AO 7.35 6.8 6.39 6.8 6.8 6.7 6.8 6.7 6.96 7 Turbidity NTU's 5 AO 1.1 <.05 0.43 0.06 0.5 <0.5 <0.5 <0.5 <0.5 <0.5 Alkalinity mg/L 151 47 47 23 53 59 53 53 49 48 Chloride mg/L 250 AO 12.5 7.3 6.41 7...

EPA develops water quality criteria based on the latest scientific knowledge to protect human health and aquatic life. This information serves as guidance to states and tribes in adopting water quality standards.