stormwater conveyance Articles

  • Stormwater: Questions and Answers

    The whole subject of Stormwater is complicated. Here's a chance for you to check out some of the most frequently asked questions about stormwater . . . and their answers. What is an NPDES (National Pollutant Discharge Elimination System) permit? The Clean Water Act prohibits anybody from discharging 'pollutants' through a 'point source' into a 'water of the United States' unless they ...


    By Ben Meadows

  • Stormwater Management for Urban Environments

    IntroductionElmhurst College, a hundred-thirty-five year old private learning institution, is proceeding with a campus redevelopment project that will include a one hundred seventy bed residence hall. In addition, the college continues to be a role model for sustainable site design and an educational resource for both students and the community.The need for additional housing, due to ...


    By Advanced Pavement Technology

  • Maintenance of a Rainstore3 Stormwater Storage Chamber

    Invisible Structures, Inc. recommends that stormwater be pretreated prior to discharging into the chambers to avoid foreign matter accumlation inside the chamber. This can be accomplished by a variety of techniques or products. Some examples are: Short Term Storage (Detention Basin) “Zero” maintenance – the Preferred Method: Use a ...


    By Invisible Structures, Inc.

  • Retrofitting an Existing Stormwater System to Meet Numerical Effluent Limits - Stormwater Management at Seattle-Tacoma International Airport

    ABSTRACTOwned and operated by the Port of Seattle, Seattle-Tacoma International Airport (STIA) is the 28th busiest airport in the world. A Section 401 Water Quality Certification was issued to the Port to allow its expansion projects to proceed. This certification required existing portions of the airport be retrofitted to meet current stormwater standards. In addition, the Port’s renewed NPDES ...

  • Monitoring performance of a novel approach to channel design for environmentally- sensitive stormwater management: Lower Silver Creek, California

    Compound channel designs are increasingly being applied in urban watersheds to achieve both stormwater conveyance and ecosystem protection and restoration goals. A compound channel project was constructed on Lower Silver Creek in 2003, and a detailed monitoring program has been implemented to assess project performance and to improve future similar channel designs. Initial monitoring results ...

  • Impervious area analysis using infra-red aerial photography

    This study was completed in order to provide the City of West Lafayette, Indiana a basis by which to fairly and equitably bill property owners for stormwater collection and conveyance.  Since the amount of stormwater runoff generated is largely dependent on the impervious area of individual properties, initial impervious area estimates of all properties have been developed using satellite ...

  • Brightwater treatment plant

    Active Treatment and Certification To meet the stringent state stormwater run-off standards during construction of the Brightwater Conveyance and Wastewater Treatment Plant Project in Woodinville, WA one active treatment system using 1% ChitoVan Chitosan Acetate was needed. Dungeness Environmental worked alongside Northwest Construction to gain approval for CESF treatment through Ecology. ...


    By Dungeness Environmental

  • North Carolina wal mart

    Passive Pre-Treatment with ChitoVan Cartridges Followed by CESF with 1.5% ChitoVan Two Chitosan-Enhanced Sand Filtration systems where implemented during the construction of a Wal-Mart Superstore and Sam's Club near Raleigh, NC. The treatment train consisted of a series of ponds with conveyance channels that utilized ChitoVan Chitosan Lactate Cartridges for treatment prior to being filtered. ...


    By Dungeness Environmental

  • The role of settling velocity formulation in the determination of gully pot trapping efficiency: comparison between analytical and experimental data

    Roadside gully pots are the connecting points between surface runoff and the underground drainage network; therefore they can be considered as the most superficial component of urban drainage systems. Gully pots are supposed to trap particulate matter washed off the catchment surface, but also to collect and convey stormwater into the network. The continuous accumulation of particulate matter ...


    By IWA Publishing

  • City of Portland Bureau of Environmental Services Deep Tunnels for Combined Sewer Overflow Storage and Transport – Portland, Oregon

    BACKGROUNDThe Bureau of Environmental Services (BES) of Portland, Oregon, began a major program to mitigate combined sewer overflows (CSOs) into the Willamette River and Columbia Slough in 1991. The Program was organized into three major phases: Cornerstone projects to reduce stormwater entering the combined sewer system, ...

  • Silt Fence installation efficacy: definitive research calls for toughening specifications and introducing new technology

    Introduction: Silt fence is a joke on many construction sites. It is often seen just blowing in the wind, or sagging and broken down. Some specifiers won’t utilize silt fence on their sites because it is too often installed improperly, and not maintained. Yet, the need for effective on-site sediment control has never been greater. Sediment-laden runoff has been shown to result in the loss ...


    By L & M Supply Company

  • Water Quality Benefits of Grass Swales in Managing Highway Runoff

    ABSTRACTGrass swales are a vegetated stormwater management technology that can remove surface runoff contamination through sedimentation, filtration by the grass blades, infiltration to the soil, and likely some biological processes. Two full-scale grass swales in the median of a four-lane highway were monitored during 18 storm events to characterize the overall performance of grass swales as a ...

  • World War II Memorial, DC - Case Study

    In 2003, AdEdge Water Technologies began working closely with EarthTech, the assigned engineering firm responsible for specifying and selecting the various water treatment systems serving the new National World War II Monument in Washington, DC. Stormwater and groundwater control and treatment are essential aspects of this project given the location of the site on the Mall adjacent to the ...

  • MLE Process Plus Flow Bending for CSO Flows

    ABSTRACTCombined sewer overflows (CSOs) are gaining the attention of environmentalists and regulators. Communities are taking steps to decrease the number of overflow events and to reduce the amount of pollutants discharged in these events. Like most communities in the Northwest, Mount Vernon, Washington, has a mandate to reduce CSOs to less than one event per year. Engineers, regulators, and ...

  • InfoWorks RS and FloodWorks: the evolving story

    InfoWorks RS was launched in 2002 as the successor to the highly-successful ISIS river modeling software. Sales Manager, Tyrone Parkinson, explains: “Customers were building bigger and bigger models, increasing both the area of coverage and also the level of detail, and this presented new challenges in terms of efficient data management. New data sources were becoming more readily available, most ...


    By Innovyze

  • Hydraulic modeling trends in 2003

    It is traditional as a New Year dawns to review the old year and draw some conclusions. Not to be left out, we asked a number of our industry experts to reflect on key developments in their area of specialism based on their observation of the activities and issues facing users around the world during 2003. We cover in turn each of our key areas – Collection Systems, Water Supply, River Systems, ...


    By Innovyze

  • ASTM Standards Help Meet Need for Clean Water

    The new ASTM Water Portal provides a single access point to standards and related information about ASTM International’s diverse committees working to protect and monitor this vital global resource. Clean and safe water is the underpinning of the quality of life for people around the world. Global economies depend on water, whether it’s to support the manufacturing of goods ...


    By ASTM International

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