Fish Diversion Articles

  • Columbia River Gets a Vertical Fish Screen - case study

    The Columbia River is huge and runs past deserts, towns, major cities and numerous recreation areas. It is a major fishery, as well. So this screen had to protect and exclude fish, handle natural and urban debris, and operate in a constricted space.  We designed and installed large vertical fish screens with hoods. Now the irrigation canal is clean and clear of river debris. The fish are ...


    By International Water Screens

  • Acoustic Doppler Current Profiler measurements near a weir with fish pass: assessing solutions to compass errors, spatial data referencing and spatial flow heterogeneity

    There has been an increasing interest in the use of Acoustic Doppler Current Profilers (ADCPs) to characterise the hydraulic conditions near river engineering structures such as dams, fish passes and groins, as part of ecological and hydromorphological assessments. However, such ADCP applications can be limited by compass errors, obstructed view to navigation satellites, frequent loss of ...


    By IWA Publishing

  • Linking North Slope of Alaska climate, hydrology, and fish migration

    Arctic grayling (Thymallus arcticus) have a life-history strategy specifically adapted to the extreme climate of the North. These fish migrate to spawning grounds just after breakup in the spring, then migrate to feeding sites in early summer, and finally in the fall migrate back to their overwintering sites. The Kuparuk River is a perennial stream originating in the northern foothills of ...


    By IWA Publishing

  • Quantifying uncertainty in the trophic magnification factor related to spatial movements of organisms in a food web

    Trophic magnification factors (TMFs) provide a method of assessing chemical biomagnification in food webs and are increasingly being used by policy makers to screen emergent chemicals. Recent reviews have encouraged the use of bioaccumulation models as screening tools for assessing TMFs for emergent chemicals of concern. The present study used a food web bioaccumulation model to estimate TMFs ...


    By John Wiley & Sons, Ltd.

  • Red Tide Cleanup with Beach Cleaners

    While the term, "Red Tide" may elicit an image of blood in the water, the coloration is due to an overabundance of microscopic algae, Karenia brevis. Besides discoloring the water, it releases a toxin that paralyzes fish, prevents them from being able to breath, and kills them. These dead fish then wash up on shore. Additionally, by consuming too much oxygen from the water, many forms of sea life ...


    By H. Barber & Sons, Inc.

  • Controlling scale deposits in the pulp & paper industry

    The pulp and paper industry is one of the heaviest users of water within the North American industrial economy, requiring on average 54 cubic meters of water per metric ton of finished product.  As water is used in nearly every part of the manufacturing process, accumulation of scale is a phenomenon that can occur in all pulp and paper making processes. This occurs even with the purest water ...

  • Development and validation of a QSAR for chronic narcosis to fish

    Vertebrate testing under REACH is discouraged and the use of alternative non‐testing approaches such as QSARs (Quantitative Structure Activity Relationships) is encouraged. However, robust QSARs predicting chronic ecotoxicity of organic compounds to fish are not available. The Ecological Structure Activity Relationships (ECOSAR) Class Program is a computerized predictive system that estimates ...


    By John Wiley & Sons, Ltd.

  • Cross‐species conservation of endocrine pathways: A critical analysis of tier 1 fish and rat screening assays with 12 model chemicals

    Many structural and functional aspects of the vertebrate hypothalamic‐pituitary‐gonadal (HPG) axis are known to be highly conserved, but the relative significance of this from a toxicological perspective has received comparatively little attention. High‐quality data generated through development and validation of Tier 1 tests for the U.S. Environmenal Protection Agency Endocrine Disruptor ...


    By John Wiley & Sons, Ltd.

  • New Flag guidance for class I area modeling

    In October 2010, final guidance was issued for assessing the impacts of new and modified sources of air pollution on Air Quality Related Values (AQRV) in Class I areas, consisting of visibility (including plume impairment and regional haze), ozone effects, and nitrogen and sulfur deposition. This guidance, which was issued in draft form on July 8, 2008, makes technical revisions to the previous ...


    By Trinity Consultants

  • Threats and human influence on coastal ecosystem of Southern India

    Populations of the majority of fish species showed drastic reduction over the past five decades in west coast of India. We conducted an intensive study of Aghanashini estuary for water quality and fish diversity in west coast of India. Coastal ecosystems are impacted by many stressors and are continually subjected to threats from multiple stresses imposed mostly by human activities predominantly ...


    By Inderscience Publishers

  • Mono nov solves another fishy problem

    A division of Monsanto, NutraSweet Kelco is the world’s largest producer of alginate, a by-product of seaweed which is used as a natural thickener in the food, pharmaceutical, textiles and pet food industries. The efficiency of the production process and the quality of the final product is heavily dependent upon the thorough screening of river water to remove all debris, such as twigs, logs and ...

  • Mono nov solves another fishy problem

    A division of Monsanto, NutraSweet Kelco is the world’s largest producer of alginate, a by-product of seaweed which is used as a natural thickener in the food, pharmaceutical, textiles and pet food industries. The efficiency of the production process and the quality of the final product is heavily dependent upon the thorough screening of river water to remove all debris, such as twigs, logs and ...

  • EPA targets electric utilities - the agency steps up efforts to manage coal ash damage

    Approximately 5.4 million cubic yards, or 1.1 billion gallons, of coal ash from the Tennessee Valley Authority (TVA) plant near Knoxville, Tenn., in December 2008 flooded some 300 acres of land, damaging property, polluting waterways, and killing fish. TVA will likely spend more than $500 million and perhaps as much as $1 billion dollars on the cleanup, says the U.S. Environmental Protection ...


    By Bergeson & Campbell, P.C.

  • The Endocrine Disruptor Screening Program: Where are we?

    The U.S. Environmental Protection Agency (EPA) issued its final list of chemicals in the first group of substances that will be screened under the Endocrine Disruptor Screening Program (EDSP).1 Development of this list caps a long, thoughtful, and arduous administrative process that spans over a decade. This “Washington Watch” column briefly reviews the development of the program, with emphasis ...


    By Bergeson & Campbell, P.C.

  • Design of a channel and floodplain corridor to restore aquatic habitat, geomorphic function and water quality in an urbanized and regulated watershed

    The City of Cupertino, California has proposed the establishment of the Stevens Creek Corridor Park. At the park site, Stevens Creek has an incised alluvial channel. Bed morphology is typified by riffles and pools with some external forcing by in-stream large woody material. The channel has been subjected to hydromodification and general anthropogenic disturbance due to upstream reservoir ...

  • Keeping quiet about DCNS

    DCNS, one of Europe’s leading naval defence groups and contractor for integrated warships and systems, is a dedicated user of Brüel & Kjær sound and vibration solutions. This article, written with the support of DCNS, illustrate show PULSE™ is playing a central role at key DCNS operation centres in Northern France; helping with design, maintenance, acceptance testing ...

  • SolarBee Technical Bulletin

    A. SOLARBEE OVERVIEW 1. Origin of the SolarBee. Pump Systems, Inc. (PSI) developed, built and installed its first solar powered mixer in Dickinson, ND, in the summer of 1998. It was installed into a 30 acre x 13 foot deep municipal wastewater reservoir which had a long history of toxicity associated with ammonia, odor, and stratification problems. In six weeks the entire reservoir cleared up to ...


    By Medora Corporation

  • A Sound Projector for Acoustic Tomography and Global Ocean Monitoring

    Abstract—Long-range underwater acoustic systems, such as those used in ocean acoustic tomography, require low-frequency signals covering a broad frequency band. To meet this requirement, a novel design based on of a tunable narrow-band high-efficiency sound projector has been exploited. The projector transmits a frequency sweep signal by mechanically tuning a resonator tube (or organ pipe) ...

  • Hydroelectric Power Stations and Fish Migration

    Hydroelectric power stations in rivers produce potential injury to downstream migrating fish as they pass through the turbines. Highest mortality rates are found for eel and ranges between 15 and 38%. The impact of fish passage through a series of hydroelectric power stations in one river can be very high. This might be the case for river systems like the river Rhine or Meuse where many ...


    By Sweco Nederland BV

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