Water Intake Structures Articles

  • Cooling Tower Trash Racks and Flow Straghteners Case Study

    The trash racks and flow straighteners were 19-feet deep by 16-feet wide with a clear spacing of 2 ¾”. Materials used in the fabrication and assembly of these units included: pultruded FRP structural components and HDPE blades. The trash racks were shipped fully assembled and ready for installation. They came with lifting ...

  • Guarantee rate of freshwater in a river mouth intruded by saltwater with respect to the joint impact of runoff and tide

    Saltwater intrusion is detrimental to water utilization. It is of vital significance to study the joint impact of runoff and tide on salinity and the risk of saltwater intrusion. To analyze the risk of saltwater intrusion, this paper proposes two concepts: critical runoff–tide level line and guarantee rate of freshwater. Taking Nandu River Estuary in China as a study case, a three-dimensional ...


    By IWA Publishing

  • Raw water intake monitoring - Case Study

    The Situation Hydrocarbons in municipal water supplies, including fresh water and desalination systems, are commonly limited to less than 1 part per million. Surface water from rivers, lakes, or the sea with marine traffic, nearby pipelines, or regular flooding can be contaminated by hydrocarbons. Freshwater treatment systems can be damaged by hydrocarbons or allow them to pass through ...

  • Hydraulic system to ensure constant rainfall intensity (over time) when using nozzle rainfall simulators

    Rainfall simulation is widely used in the laboratory and in field work to produce artificial rainfall for small-scale surface hydrology and soil erosion studies. Simulated rainfall produced by simulators must be predictable, accurate and consistent to be useful to model the related physical processes. Pressure fluctuations in the water supply system frequently cause variation in rainfall ...


    By IWA Publishing

  • WWEMA Window: Tackling today`s top challenges

    On September 24, 2013, the Water and Wastewater Equipment Manufacturers Association (WWEMA) held its annual President’s Council at the Chicago O’Hare International Airport. This is an informative one-day event where top executives of WWEMA-member companies get together to share and discuss industry trends, national and international economic news, and upcoming regulatory issues. This ...


    By Smith & Loveless Inc.

  • An approach for determining the most critical among a suite of chemical contaminants at a drinking water intake

    An integrated approach for the identification and assessment of the most critical chemical contaminant(s) at a drinking water intake has been developed. It involves the determination of a threshold or critical raw water concentration (CRWC) for target contaminants using the observed overall removal efficiency of a specific water treatment plant (WTP) and regulated drinking water concentrations ...


    By IWA Publishing

  • Pulp & Paper Mill #1

    Problem: This company manufactures Gypsum Wallboard on a one-cylinder machine. It furnishes recycled paper (box, cardboard and newsprint) and it operates 340 days/year. The system holds 100,000 gallons at 120°F. It's objective was to reduce sewer loading. Solution: Hydrocal installed a CAF-1 50 unit and shut down the original pumps. The plant now shows ...


    By HydroCal Inc.

  • Probabilistic analysis of risks to U.S. drinking water intakes from 1,4‐dioxane in domestic wastewater treatment plant effluents

    The risks of 1,4‐dioxane (dioxane) concentrations in wastewater treatment plant (WWTP) effluents, receiving primarily domestic wastewater, to downstream drinking water intakes was estimated using distributions of measured dioxane concentrations in effluents from 40 WWTPs and surface water dilution factors of 1,323 drinking water intakes across the U.S. Effluent samples were spiked with an ...


    By John Wiley & Sons, Ltd.

  • Culvert trash screen blockage warning

    Wychavon District Council commissioned Hydro-Logic to install a system to monitor rising flood levels on the Bengeworth Brook in the Evesham area. Residents had been particularly vulnerable to the effects of 'trash screen' blockages at a culvert location. Storm events similar to the 2007 summer floods had caused particular maintenance problems for the Engineering Team at Wychavon. Design and ...

  • Cottingham Culvert Trash Screen monitoring

    East Riding of Yorkshire Council commissioned Hydro-Logic to install flood monitors in the village of Cottingham, near Kingston upon Hull. Residents in this area had been dramatically affected by the floods of June 2007. Extremely intense rainfall combined with already saturated land resulted in localised flooding which was made worse by the effects of easily blocked 'trash screens' at numerous ...

  • Seasonal stratification effects on risk quantification of contaminant spreading in a warm monomictic lake under different hydrodynamic conditions: a case study in Lake Constance, Germany

    Seasonal stratification plays a significant role in contaminant spreading in a warm monomictic lake. If any accident related to pollutant spills occurs in a warm monomictic lake, different risk levels will result depending on the type of lake stratification, location of pollutant release, and hydrodynamic conditions. In this study, seasonal stratification effects on risk of contaminant spreading ...


    By Inderscience Publishers

  • Energy - World’s biggest bio fuel power plant

    Oy Alholmens Kraft Ab runs the biggest bio fuel fired power plant in the world. The plant is located in the town of Pietarsaari on the Finnish west coast. The plant uses mostly biotype materials as the power source. They include peat, bark, and wood and wood chips with coal as the backup reserve fuel. The total annual production is approximately 265 MW. The versatile power plant enables the ...


    By Kopar Oy

  • Trash Screen Monitoring in Falkirk

    Falkirk County Council, Scotland Supply and installation and maintenance of a Trash Screen blockage and Flood Warning system, 2006 - ongoing Hydro-Logic was appointed by Falkirk County Council to supply, install and commission a series of sites where there were concerns over flooding. The systems were deployed to supply alarms to a central control office at Falkirk ...

  • Procedure for Determining the Segregation Potential of Freezing Soils

    Basic frost heave data obtained from various types of laboratory freezing tests, using computerized ramp temperature generation and temperature control at both warm and cold ends of a soil specimen, are analyzed to determine the segregation potential. Automatic volume change measurements provide fair values of cumulative water intake, but not accurate water intake rates. A method based on ...


    By ASTM International

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