fish passes Articles

  • Seven Ways Your Facility Isn’t Meeting Effluent Regulations and How to Solve Them

    Whether you own, operate, or help manage a municipal or industrial facility that deals with wastewater, it’s important to understand how wastewater treatment can play a significant role in the overall health of your business, especially when it comes to meeting effluent regulations. This is an important part of the wastewater treatment process to consider, as ignoring it could earn your ...


    By SAMCO Technologies, Inc.

  • 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

  • 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

  • State Fish Hatcheries and Invasive Species Don’t Mix

    INTRODUCTION The Vermont Fish and Wildlife Department is responsible for the protection and management of the state’s fish populations. Cultured fish are stocked in natural and manmade areas that are excellent for growth and survival but have little or no spawning habitat. Other stocking areas include natural water bodies where spawning and nursery habitats have been destroyed or isolated from ...

  • Biochemical study of freshwater fish catla catla with reference to mercury chloride

    Heavy metals are being passed on into aqueous environments through industrial processes, sewage disposal, soil leaching and rainfall. The concentrations of these heavy metals are sublethal or lethal to aquatic organisms when the duration of exposure to these metals are prolonged (Eisler and Gardener, 1973). It is well documented that effect of heavy metals are dependent upon the physical and ...


    By University of Tehran

  • Wild Rose State fish hatchery renovation case study

    Wisconsin Department of Natural Resources Wild Rose, Wisconsin, USA After more than 100 years, the Wild Rose hatchery in central Wisconsin was showing its age. Wastewater discharge to a nearby Class 1 trout stream was also a cause of concern. With HDR as its fisheries consultant, the state decided to replace the facility based on the need to address comprehensive ...


  • Field trip road log: big pine/white-inyo mountains/bristlecone pine forest, deep springs valley to fish lake valley.

    This field trip starts at Big Pine, California and takes you through spectacular geology, the oldest trees in the world and even a view of a glacier. As you go east you will leave Owens Valley and ascend into the White-Inyo Mountains, the first mountain range encountered in the Basin and Range Province in this part of California. You will have the opportunity to view the sequence of Cambrian and ...


    By Hargis + Associates Inc

  • PAMBuoy: helping to protect salmon during the new forth bridge construction case study

    When you cross the Forth Road Bridge you probably don’t realise that you are passing over two PAMBuoy units that are protecting fish during the construction of the new ...

  • Odour control case study

    A Scottish maggot farm, supplying bait for fishing, faced the problem of dealing with ammonia odours emitted during production. The Scottish Environmental Protection Agency (SEPA) had given the company an emissions discharge consent level of a demanding 5ppm of ammonia. To achieve this the maggot farm commissioned a biofilter to remove the pollutants from the air stream. The design of the ...


    By Cleveland Biotech Ltd.

  • OTT ADC measurement - Germany

    Background As the open pit Cottbus Nord is making use of the water of the ponds in the protected landscape of Lakoma (a village 6 km from Cottbus) the Vattenfall Europe Mining AG (VEM) as owner of the pit was obligated to take compensation measurements. VEM entrusted the engineers of the gerstgraser Ingenieurbüro für Renaturierung (gIR) in Cottbus with the planning of the ...

  • EPA Identifies Endocrine Disruptor Chemicals

    EPA identified an initial list of 64 pesticide active ingredients and nine HPV/pesticide inert chemicals to undergo Tier 1 screening in the EDSP. On June 18, 2007, EPA issued its long-awaited draft list of chemicals selected for so-called “Tier 1” screening under the Endocrine Disruptor Screening Program (EDSP). EPA repeatedly emphasized in the notice, as well as in other statements it prepared ...


    By Bergeson & Campbell, P.C.

  • Biodegradable flocculants: Power of `natto`

    Just by adding and stirring (1 agent, 1 process) 'PG alpha 21Ca' to polluted water, it separates supernatant water with better turbidity, BOD, and COD, and sediments in a short time. This high-molecular flocculent adsorbs strongly the exogenous incretion disturbance substance (Environmental hormone ), like dioxin. By using this high-molecular flocculent, it is possible to draw and collect ...


    By Poly Glu USA

  • Aggressive dewatering aids concrete rehab at Abitibi

    An enormous volume of water passes through the Abitibi Canyon Generating Station every hour of every day. In order to complete critical concrete repairs on the hydro power station, general contractor The Barclay Construction Group needed to find a way to pump and discharge almost 30 million gallons of water in a 500-metre section of the river upstream from the station in under 30 hours. Aquatech ...


    By Aquatech Dewatering Company

  • Water quality is key to the success of Cardiff Bay

    Water quality has been a central theme in a redevelopment project that began with the creation of the Cardiff Bay Development Corporation in April 1987. This article will examine the role that water quality has played in the remarkable transformation that has taken place in Cardiff and explain how monitoring technology has developed to the stage whereby any person, anywhere in the world, can view ...

  • Mendocino case study

    As representatives of a small community, the Mendocino City Community Services District administrators felt strongly that they needed to deliver terrific wastewater treatment value at the lowest cost for their taxpayers. But they knew they needed to make a change, as their existing wastewater treatment system left unwanted solid accumulations at numerous points throughout their 1MGD treatment ...


    By Aqualitec Corp.

  • Effect of alternative on-site wastewater treatment on the viability and culturability of Salmonella choleraesuis

    ABSTRACTThe objective of this study was to determine how alternative on-site wastewater treatment systems (i.e. subsurface flow constructed wetlands, intermittent sand filters and intermittent peat filters) affect the viability and culturability of Salmonella choleraesuis (serotype typhimurium, ATCC 23567). Influent was a high strength septic tank effluent (BOD5 240-344 mg ...


    By IWA Publishing

  • Mercury Analysis

    Characteristics of Mercury What is Mercury? Mercury is a naturally occurring silver-colored metallic element noted for its occurrence as a liquid at room temperature and toxic to living organisms. This silvery, opaque liquid metal is very dense, yet has a high surface tension that causes it to form tiny perfect spheres in the pores of the rocks it is found in. It is ...


    By HORIBA Europe GmbH

  • Scaletron - case study

    The Customer L A Maintenance is a leading building services maintenance contractor well known for its innovative approach. One of its functions is the maintenance of air-conditioning units for computer suites and other areas where controlled air quality is essential. The problem In order to ensure a controlled air quality the air conditioning units are ...

  • The number one thing we can do to protect Earth’s oceans

    Marine governance favors consumption and commerce over conservation. Here's what we can do about it. When New England fishers complained of working harder and harder to catch fewer and fewer fish, Spencer Baird assembled a scientific team to investigate. Though a fishery failure would once have seemed inconceivable, Baird wrote in his report, “an alarming decrease of the ...


    By Ensia

  • Case study - San Francisco Public Utilities Commission (SFPUC)

    Service: Sahara Leak Detection Client: San Francisco Public Utilities Commission (SFPUC) Project Date: 2004 Type of Pipelines: Transmission Mains Diameter: 42 and 54-inch Pipe Material: Cast Iron Steel Length: 1.72 miles The San Francisco Public Utilities Commission (SFPUC) provides water to 2.4 million people in San Francisco, Santa Clara, Alameda and San Mateo ...


    By Pure Technologies

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