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Showing 1 to 20 of 27 for “"water quality criteria"”.
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Water Quality Criteria for Selected Recreational Uses--Site Comparisons
Made available in DSpace on 2014-12-12T01:12:05Z (GMT). No. of bitstreams: 1 7212077.pdf: 11350370 bytes, checksum: 6af31c4ae56ce14191da19f4062f46f0 (MD5) Previous issue date: 1971
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Evaluation of the Development and Effectiveness of Copper Total Maximum Daily Loads (Tmdls) to Achieve Marine Water Quality Criteria
… concentrations of certain chemicals in surface water are known to be toxic to aquatic organisms (e.g., barnacles, algae, and fish). For a number of these chemicals (e.g., tributyltin [TBT], copper) federal and state water quality standards exist to protect aquatic organisms. As a means to comply …
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Assessing Industrial Contamination of Brockport Creek After Removal of Contaminated Sediment
… cleanup they ranged from 288 to 432 µg/kg, below water quality criteria for aquatic organisms and human health. The number of heavy metals detected in sediments after the cleanup decreased from 22 to eight, and their concentrations also decreased. After the cleanup, concentrations of metals ranged …
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A Multimetric Benthic Index for Georgia's Wadeable Streams
… that the Multimetric Rating System is a robust water management tool that may be used to evaluate stream condition, determine water management decisions, and describe water quality criteria.</p>
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Comparing Alternative Methods of Simulating Bacteria Concentrations with HSPF Under Low-Flow Conditions
… a bacterial impairment in an upland, rural watershed, direct deposit (DD) fecal bacteria sources (livestock and wildlife defecating directly in the stream) often drive the source-load reductions required to meet water quality criteria. Due to limitations in the application of existing …
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Acute Toxicity of Ammonia and Copper to Mussel (Bivalvia: Unionidae) Glochidia Inside and Outside of Conglutinates
Regulations regarding the allowable limits of water pollution are often based on the levels of those pollutants that are toxic to the most sensitive freshwater organisms. Freshwater mussels (Unionoida) are unusually sensitive to certain pollutants and therefore have potential to drive water quality …
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An Ecotoxicological Recovery Assessment of the Clinch River Following Coal Industry-related Disturbances in Carbo, Virginia (USA): 1967-2002
… that were reported to have exceeded water quality criteria from 1985-1989. These impacts have provided impetus for many research projects addressing the absence of bivalves, including federally protected species of native mussels (Unionoidea), from sites influenced by CRP effluent. …
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The status and seasonal dynamics of fish and benthic invertebrate populations in relation to organic and inorganic material inputs and surface mining impacts in three Virginia headwater streams
… the former despite reclamation treatment of the watersheds three to five years earlier. The mined-watershed streams carried a heavy benthic sediment burden, due primarily to the continued erosion from the mined areas and from abandoned haul roads. Inorganic sediment in the mining-impacted streams …
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Characterisation, Treatment and Utilisation of the Effluent from an Intensive Fish Farm
… control and management information on aspects of water quality in fish farming. The metabolic products produced by intensively farmed rainbow trout have been assessed and the production rates can be used to predict water quality. The water quality requirements of trout have been reviewed and …
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Scientifically Based Water Resource Management and Environmental Quality Planning: Barry/Stone Counties, Missouri
Protection of the quality of valuable water and other environmental resources in the Mark Twain National Forest, located in Barry and Stone Counties, Missouri may be effected through application of a three pronged planning approach. This methodology includes 1) an integrated, comprehensive …
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Acute and chronic effects of selenium on Daphnia pulex
… with selenium were conducted with three freshwater species. All data are expressed as selenite-selenium. Daphnia pulex had a 48 hr LC50 of 3.87 mg/l selenium. The 96 hr LC50 and EC50O values for Gambusia affinis and Physa sp. respectively, were 12.56 and 27.08 mg/l selenium. The sublethal …
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Bioavailability and toxicity of nickel to freshwater organisms : a modeling approach
Water quality criteria setting for metals is hampered by the fact that the bioavailability and hence also the toxicity of many metals is largely influenced by physicochemical parameters such as water hardness, pH and dissolved organic matter. Consequently, a single water quality criterium may be …
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Evaluating human fecal contamination sources in Kranji Reservoir Catchment, Singapore
… Kranji Reservoir to recreational use. However, water courses within the Kranji Reservoir catchment contain human fecal indicator bacteria above recreational water quality criteria; their sources and distribution under dry and wet weather are also unknown. The goal of this study was to evaluate …
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Water Quality Impacts of Cover Crop/Manure Management Systems
Crop production, soil system, water quality, and economic impacts of four corn silage production systems were compared through a field study including 16 plots (4 replications of each treatment). Systems included a rye cover crop and application of liquid dairy manure in the spring and fall. The …
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The Toxicity of Ammonia to Atlantic Silverside (Menidia menidia) and Ghost Shrimp (Palaemonetes pugio)
… to be toxic to aquatic organisms. The national water quality criteria for ammonia in the marine environment have been established to protect aquatic organisms from the toxicity of ammonia. Discharge into Chesapeake Bay has not yet been regulated under this criteria. Ammonia limits of 1-2 mg/L …
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Ecotoxicological Investigations in Effluent-Dominated Stream Mesocosms
… from the City of Denton, TX, Pecan Creek Water Reclamation Plant (PCWRP), were treated with 0, 15 or 140 µg/L cadmium for a 10-day study in August 2000. Laboratory toxicity test and stream macroinvertebrate responses indicated that cadmium bioavailability was reduced by constituents of …
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Development of unsaturated flow functions for low impact development stormwater management systems filter media and flow routines for hydrological modeling of permeable pavement systems
<p>Low Impact Development - Stormwater Management (LID-SWM) systems are relatively new technologies that were developed in order to meet the water quality criteria imposed by the Clean Water Act. LID-SWM is also used to replicate the natural hydrology of developed sites. However, the hydrological …
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Estimating Uncertainty in HSPF based Water Quality Model: Application of Monte-Carlo Based Techniques
… a methodology for the uncertainty estimation in water quality modeling as related to TMDL development, four Monte Carlo (MC) based techniques—single-phase MC, two-phase MC, Generalized Likelihood Uncertainty Estimation (GLUE), and Markov Chain Monte Carlo (MCMC) —were applied to a Hydrological …
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Levels of Dissolved Solids Associated with Aquatic Life Effects in Headwater Streams of Virginia's Central Appalachian Coalfield Region
Benthic macroinvertebrate communities in headwater streams influenced by Appalachian coal mining often differ from communities in minimally distrubed streams. Total dissolved solids (TDS) associated with mining have been suggested as stressors to these communities. In studies of such streams …
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Environmental impact of heavy metal pollution in natural aquatic systems
… and to do so with particular emphasis on the water column concentrations. Regulatory levels reflected in water quality criteria or standards are based on water column concentrations. Predicting water column concentrations requires a consideration of the interactions of water column …
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