Related Experiment Video
Updated: Apr 1, 2026
12:50
Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
Published on: September 26, 2017
12.2K
Implementing Effects-Based Water Quality Criteria for Eutrophication in Beaver Lake, Arkansas: Linking Standard
Journal of Environmental Quality
|October 6, 2015
Summary
Arkansas
Area of Science:
- Environmental Science
- Limnology
- Water Quality Management
Background:
- Nutrient pollution can cause eutrophication, impacting water quality.
- Arkansas established effects-based water quality criteria for Beaver Lake, including chlorophyll (chl-) and Secchi transparency (ST) standards.
- The adopted criteria lacked a defined methodology for assessing exceedances.
Purpose of the Study:
- To estimate the risk of exceeding Beaver Lake's new water quality standards.
- To analyze spatial and temporal variations in water quality data.
- To recommend an assessment methodology for regulatory flexibility.
Main Methods:
- Hydrologic frequency analysis was applied to measured and modeled data (2001-2014).
- Spatial patterns of ST and chl- were analyzed along the river-reservoir gradient.
- Relationships between nutrients (total phosphorus) and water quality indicators were examined.
Main Results:
- Secchi transparency (ST) increased and chlorophyll (chl-) decreased downstream towards the dam.
- Higher chl- and lower ST correlated with increased total phosphorus concentrations.
- The risk of exceeding water quality criteria varied significantly with spatial and temporal assessment periods.
Conclusions:
- A minimum of 50% of assessed years should indicate a water quality violation.
- Assessment methodology should account for spatial and temporal variability.
- Recommendations provide flexibility for regulatory agencies in water quality standard assessment.
Related Concept Videos
01:24Freshwater Microbial Ecology
39
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic...
39
01:19Quality of Water
699
In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
699
01:50Threats to Biodiversity
27.8K
There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
27.8K
01:14Testing Water Quality
563
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
563