Environmental Modeling Articles

  • QMS documentation - “What should I document?”

    Good QMS documentation is essential for an effective quality management system. Properly structured documentation will make your operations much easier, while incorrect documentation will bring you nothing but trouble. Use qmsWrapper to structure your QMS documentation, follow the necessary steps and avoid those unpleasant last minute surprises.   Usually,  ...


    By qmsWrapper

  • Modeling Tip: How to import model objects from AERMOD-related files into BREEZE AERMOD

    BREEZE AERMOD provides modelers with the ability to import model objects from existing AERMOD related files. The supported files include EPA AERMOD and ISC input files (.dat), BREEZE AERMOD input files (.ami), source files (.pnt), receptor files (.rec), and building files (.bld). With these file types, users can import model object data including, but not limited to, locations, exit ...

  • In a Future of Extremes, Southeastern States Must Have Water Management Policies

    Introduction Climate change is expected to have an impact on every type of weather phenomenon that occurs on Earth.  The nature and magnitude of the impact varies with the location on the planet and the type of weather in question, and coupled climate-weather models, have different degrees of uncertainty about different types of weather (though these models are dramatically improving ...


    By Climate Institute

  • Documented Information – the new Document and Records Control

    Have you ever felt overwhelmed by the management of documents and records?  By the sheer tediousness and volume of administrative work required to manage and maintain all of the documents and records needed to demonstrate conformance to your management system? Well, you are not alone.  This is a common frustration by all management system administrators.  To top it all off, you ...

  • Case study - Flood warning station at Kriebstein, Saxony - Germany

    As flood-warning station and hydrometric base station with a catchment basin of 1754 km2 , reliable data monitoring is extremely important for the hydrological balance of Freiberg and for the whole area around the Mulde. The power plants, located up and down stream of this gauging station, influence the water level and water flow surrounding it.  As a solution for measuring the discharge, ...

  • Removing VOCs from Municipal Water Supply - Case Study

    QED E-Z Tray® Air Strippers Removing Volatile Compounds in Cheyenne’s Drinking Water The U.S. Army Corps of Engineers (USACE) – Omaha District has funded the design and construction of a new groundwater treatment plant in Cheyenne, Wyoming to treat groundwater from the city’s Borie well field.  This important groundwater supply was apparently ...


    By QED Environmental Systems

  • Simulation and uncertainty analysis for groundwater levels using radial basis function neural network and support vector machine models

    Accurate measurement of groundwater levels is often difficult and involves great uncertainty. Therefore, simulating and predicting the fluctuating behavior of groundwater levels is necessary for water resource planning and management. In this study, radial basis function (RBF) neural networks and support vector machines (SVM) were employed to simulate groundwater level fluctuations. The time ...


    By IWA Publishing

  • Speaking the language of risk: climate change and the future of business

    In an increasingly carbon-constrained economy, it is clear that an organization’s environmental, social and financial performance is dependent on climate action. The development of a thorough and goal-oriented sustainability program, one that integrates climate change impacts into risk management and takes into account the key role of private and public stakeholders, is critical to ...


    By Bullfrog Power Inc.

  • Large TCE Plume with Extensive DNAPL - Case Study

    ABSTRACT High density sampling program was key to remediation of soil and groundwater impacted by TCE DNAPL at a former industrial site underlain by river deposits and sedimentary bedrock. CHALLENGES Impacted alluvium consisted of poorly sorted, fine to coarse grained sand. The source area was underlain by an aquitard of silt and clayey silt where dense ...

  • Evaluation of the relative roles of a vegetative filter strip and a biofiltration swale in a treatment train for road runoff

    In order to determine the relative importance of a vegetative filter strip and a biofiltration swale in a treatment train for road runoff, US EPA Storm Water Management Model was used to model infiltration and runoff from the filter strip. The model consisted of a series of subcatchments representing the road, the filter strip and the side-slopes of the swale. Simulations were carried out for ...


    By IWA Publishing

  • How risk assessments can make a city more resilient to weather extremes

    Balancing water supply and demand—while addressing current and future vulnerabilities to extreme conditions such as drought—is essential to safeguarding the wellbeing of our communities. Is your city at risk? Identifying where cities have problems and determining how much is at risk is the first step to becoming a strong, resilient city. In states like California, water shortage is ...


    By CH2M Hill Companies, Ltd.

  • Process optimization via response surface methodology in the treatment of metal working industry wastewater with electrocoagulation

    In this study, process parameters in chemical oxygen demand (COD) and turbidity removal from metal working industry (MWI) wastewater were optimized by electrocoagulation (EC) using aluminum, iron and steel electrodes. The effects of process variables on COD and turbidity were investigated by developing a mathematical model using central composite design method, which is one of the response ...


    By IWA Publishing

  • A new methodology for surcharge risk management in urban areas (case study: Gonbad-e-Kavus city)

    This research presents a simulation-optimization model for urban flood mitigation integrating Non-dominated Sorting Genetic Algorithm (NSGA-II) with Storm Water Management Model (SWMM) hydraulic model under a curve number-based hydrologic model of low impact development technologies in Gonbad-e-Kavus, a small city in the north of Iran. In the developed model, the best performance of the system ...


    By IWA Publishing

  • Using numerical simulation of a one stage vertical flow wetland to optimize the depth of a zeolite layer

    This simulation study investigates the treatment performance of a compact French vertical flow wetland using a zeolite layer in order to increase ammonium nitrogen removal. For the modelling exercise, the biokinetic model CW2D of the HYDRUS Wetland Module is used. The calibrated model is able to predict the effect of different depths of the zeolite layer on ammonium nitrogen removal in order ...


    By IWA Publishing

  • Relationship between biochars’ porosity and adsorption of three neutral herbicides from water

    The porous biochars have exhibited good adsorption to many organic pollutants, but the relationship between biochars’ porosity and their adsorption capacity is not clear at the moment. In this work, six biochars were produced from different feedstocks and under different pyrolysis conditions, and used for adsorption of three neutral herbicides from water. The results demonstrated that the ...


    By IWA Publishing

  • World Bank: groundwater management specialist

    The World Bank is currently looking for a senior water resources specialist specializing in groundwater management to join the South Asia water team. The World Bank’s regional portfolio is in South Asia comprises over $5 billion of lending, of which around half is for water supply and sanitation and half for water resource and irrigation projects and a strong focus in India. These projects ...


  • An approximate model on three-dimensional groundwater infiltration in sewer systems

    Groundwater infiltration through cracked sewer pipes has caused significant economic losses. This paper presents a three-dimensional analytical expression for calculating the steady-state groundwater infiltration rate into sewer systems. As an extension of the previously developed two-dimensional model by the author, this new model can be used to simulate the infiltration through an orifice ...


    By IWA Publishing

  • Modeling Tip: Importing & Exporting Traffic Data in CALRoads View

    The CALINE series of models was developed to estimate pollutant concentrations from motor vehicles at roadway intersections. It includes three primary models: CALINE, CAL3QHC, and CAL3QHCR. The latter allows processing of real meteorological data (up to one year) and input of vehicular emissions, traffic volume, and signalization (ETS) data. Data reflecting traffic conditions for individual hours ...


    By Lakes Environmental Software

  • Optimization of atmospheric air plasma for degradation of organic dyes in wastewater

    This study optimises the degradation of a cocktail of the dyes methyl orange and bromothymol blue by atmospheric air plasma. Response surface methodology (RSM) was employed to investigate the efficacy of the plasma process parameters on degradation efficiency. A Box–Behnken design (BBD) was employed to optimise the degradation of dyes by air plasma discharge. A second order polynomial equation ...


    By IWA Publishing

  • Study shows online consumers want environmentally friendly options

    Reducing the carbon footprint of what we buy isn’t easy, but the opportunity for impact is substantial: In the United States, producing and delivering consumer purchases releases twice as much carbon into the atmosphere as home energy use and personal travel. By gathering and sharing information on carbon emissions associated with their products, companies can make environmentally friendly ...


    By Ensia

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