Posts filed under: Stormwater

The Metropolitan Sewer District of Greater Cincinnati (MSDGC) maintains a model of its sewer system to assist with planning, analysis and design related to stormwater runoff, combined and sanitary sewers and other drainage systems in its service area. The model is separated into multiple System Wide Models (SWMs), including the Mill Creek SWM that represents both sanitary and combined sewer areas in 19 subwatersheds. As the second largest stormwater management model (SWMM) in the world, the Mill Creek SWM is being enhanced by Wade Trim to reduce simulation run times, facilitate ease of functionality to make upgrades, and improve overall performance in simulating system flows.

The model’s massive size creates issues for reviewing and editing, and multiple problems for MSDGC and their consultants, including long simulation run times and difficulties managing ongoing work on various sub-watersheds. With 6,550 subcatchments, 28,000 junction nodes and 28,400 conduit links, the model will be reviewed to identify points in the system to break apart the overall Mill Creek SWM into smaller, more manageable sub-watershed models and an interceptor model. Portions of the system may also be impacted by receiving stream water levels during annual simulations, which will require development of boundary conditions at any impacted outfalls. A check-out and check-in system will be developed, and inter-submodel communication will be provided through the use of interface files.

The Mill Creek SWM enhancements are expected to be complete by the end of 2016 to support the MSDGC’s Wet Weather Improvement Program Phase 2 planning efforts. The model is currently being used to plan and design Phase 1 improvements on critical timelines.

Dave White, PE, has been named Wade Trim’s Water Resources Market Segment Lead where he will oversee all water resources-related services across the company. A Senior Project Manager, Dave has spent the last 22 years evaluating challenges with wet weather flows in collection systems throughout the country. He strives to find practical and sustainable solutions for complex stormwater, combined sewer overflow (CSO) and sanitary sewer overflow challenges.

Dave has been at the forefront of Wade Trim’s expansion, building relationships with large utilities to rehabilitate aging infrastructure and address capacity limitations. He has managed projects in Cincinnati, Cleveland, Omaha, Indianapolis, Fort Worth and southeast Michigan. His current projects include the Metropolitan Sewer District of Greater Cincinnati’s Upper Duck All Bundle and storage facility evaluations for the Metropolitan St. Louis Sewer District.

Craig Schroeder, PE, joined our Water Resources Group in Cincinnati, OH, as a Professional Engineer who specializes in sanitary, combined and storm sewer modeling. He brings more than seven years of experience in hydrologic and hydraulic modeling and alternatives analysis for combined sewer overflow (CSO) control, sanitary sewer overflow (SSO) elimination, and system optimization. He has also performed water quality sampling and flow monitoring.

Craig’s previous experience includes system-wide model updates for the Metropolitan Sewer District of Greater Cincinnati’s Mill Creek and Little Miami sewersheds and water sampling of creeks and sewers for Sanitation District No. 1 in Northern Kentucky. He is currently working on the Northwest Interceptor – Edgewater System Analysis and Advanced Facilities Planning for the Northeast Ohio Regional Sewer District. He holds a BS degree in Civil and Environmental Engineering from the University of Dayton.

Andrew Buncher, EIT, joined our Water Resources Group in St. Louis, MO, as an Engineer. He brings education and experience in the design of stormwater collection, wastewater treatment, and water distribution networks and general hydrologic concepts. He is currently involved with the preliminary study and design services for sanitary sewer storage facilities for the Metropolitan St. Louis Sewer District. He graduated magna cum laude in 2014 with a BS in Civil Engineering from Southern Illinois University Edwardsville.

Nick DuBose, PE, joined our firm as a Project Engineer where he will work on municipal, water resources and site development projects. Based in our Roanoke, TX, office, he will also focus on expanding our local business development efforts. Nick brings five years of design experience in utilities, stormwater management and site development. Currently, he is coordinating with our water resources professionals in Detroit, MI, to bring the first segment of the Westcliff Stormwater Drainage Improvements project for the City of Fort Worth to construction. He holds a BS degree in Civil Engineering from Texas A&M University.

The discharge of high-strength industrial waste, primarily from meat packing industries, to the Omaha combined sewer system has been a historical water quality concern. To eliminate the overflow of these high-strength waste streams to the Missouri River during storm events, the City of Omaha Public Works Department completed the South Omaha Industrial Area Project (SOIAP) that established a separate treatment system for these flows. This early action project in the City’s Long Term Control Plan received a Merit Award in Engineering Excellence from the American Council of Engineering Companies of Nebraska at their annual banquet in Omaha.

Designed by Wade Trim, the project included construction of a new, 17.4-million gallons per day (MGD) lift station and mile-long, dual force main to carry these flows directly to the Missouri River Wastewater Treatment Plant. Special provisions were designed into the lift station to provide preliminary treatment for this wastewater’s high levels of fats, oils and grease. Rigorous cleaning capabilities, including a unique pigging system that cleans the interior walls of the force main pipes, will help keep the facility working efficiently for years to come.

Though the volume of overflow reduced is only about 3% of the annual total, this project is expected to reduce the total amount of bacteria released into the river from the City by nearly 30%, providing substantial water quality and public safety benefits and compliance with EPA requirements. This project has delivered a high return on investment for rate payers while improving the aroma of the South Omaha neighborhoods traversed by the sewers, adding an aesthetically-pleasing public works facility and bioretention pond, and redesigning a park trail into a dual use facility access road and urban bike/pedestrian path.

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The lift station wet well features a narrow trench and polyurethane coating to facilitate cleaning of fats, oils and grease.

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A built-in pigging system allows for force main cleaning to keep the pipeline flowing smoothly.

Jason McBride, PE, joined our Water Resources Group in Pittsburgh, PA, as a Senior Project Manager where he will provide wet weather and wastewater collection system engineering services to clients. His primary role will be working on wet weather projects for combined sewer overflow (CSO) and sanitary sewer overflow (SSO) facilities including wastewater treatment plants, high rate treatment facilities, large diameter tunnels and pump stations.

Jason brings 14 years of experience in planning, design and construction phase services with an emphasis on CSO long term control plans and SSO capital improvement plans. He seeks opportunities to incorporate sustainable design, green infrastructure, and low impact development into regional wet weather plans to maximize economic, social and environmental benefits. In addition, he serves as a Board Member for the Nine Mile Run Watershed Association and holds a BS degree in Environmental Systems Engineering from Pennsylvania State University.

John Weiland, PE, joined our Water Resources Group as a Senior Project Manager where he is leading our expansion into St. Louis, MO, and work with the Metropolitan St. Louis Sewer District (MSD). With 17 years of experience in wastewater, stormwater and construction management projects, John’s career includes extensive work with MSD ranging from pump station and force main projects to Combined Sewer Overflow (CSO) and Sanitary Sewer Overflow (SSO) relief studies.

Wade Trim is performing preliminary study and design services for sanitary sewer storage facilities in the Lemay Service Area for MSD. Our services comprise storage sizing and hydraulic evaluation, as well as preliminary civil, structural, process mechanical, electrical, instrumentation, and operational design considerations.

Our office is located in the downtown area:

Wade Trim
500 N. Broadway
Suite 1340
St. Louis, MO 63102
314.669.0038

By David Anthony, RLA, AICP

Green infrastructure practices are being integrated into conventional stormwater management approaches for communities across the US. Encouraged by regulatory agencies, green infrastructure and low impact development approaches are being folded into comprehensive programs for municipal separate storm sewer systems, combined sewer overflow (CSO) management, and Total Maximum Daily Loads, to improve water quality while enhancing communities. While green solutions such as porous pavement or stormwater treatment wetlands, are often implemented for a site-specific issue, solutions that are implemented using a broader, green watershed planning strategy offer greater value and ecological benefit.

A green watershed planning strategy combines gray stormwater source controls, such as a separate stormwater conveyance network or stormwater retention basin, with natural systems that capture, cleanse and reduce stormwater runoff using plants, soils and microbes. This approach seeks to create an interconnected network of open spaces and natural areas (forests, floodplains and wetlands) that improve water quality, recreational opportunities and wildlife habitat in a watershed.

Wade Trim is working with several clean water agencies and large cities to integrate green infrastructure practices as components of integrated gray and green stormwater management strategies and wet weather CSO management plans. Green practices are also serving as a catalyst for implementing community enhancements such as neighborhood stabilization, land banking strategies, recreation and open space network expansion. The major benefits of applying an integrated approach to stormwater management include:
• Peak flow reductions and flood control
• Water quality improvements
• Community enhancements
• CSO management

On a regional scale, green stormwater management strategies help preserve and restore the hydrologic functions of watersheds, reducing peak flows and providing flood control during wet weather events. On the site or neighborhood scale, a variety of structural and non-structural controls are used to mimic a site’s predevelopment hydrology using design techniques that infiltrate, filter, store, evaporate and detain runoff close to its source. Because green infrastructure practices address low-volume storm events, usually about 1 inch of rain, they should be used to supplement, not replace, gray stormwater management techniques to mitigate flooding problem areas.

Green practices can be used to protect and preserve surface and ground water quality as well as the integrity of receiving streams. A treatment train of pollutant absorbing practices that efficiently remove sediment, metals, nutrients, oil, grease and, in some cases, bacteria, from runoff can help manage the first flush of pollutants from rain storms. Though the treatment efficacy of many green stormwater practices is not well documented, long-term studies continue to provide reliable data that proves the effectiveness of these practices to improve the water quality of lakes and streams.

As communities seek to enhance their economic viability, green infrastructure offers a way to address environmental issues while improving quality of life. During development, major cities across the US managed wet weather flow to protect people and infrastructure by directing natural waterways to underground pipes and replacing natural drainage ways with storm sewer systems. In many cases, this approach has undermined local and regional ecosystems and limited the ability of nature to provide flood protection, air purification, climate regulation, erosion control and biological habitat. Large-scale green infrastructure practices can be used to recreate the functions of healthy ecosystems, so natural processes are harnessed for community and environmental enhancements. Healthy ecosystems also contribute to the well-being of residents by providing access to natural areas and outdoor recreation.

The watershed systems approach requires a plan that embraces the unique set of conditions and circumstances of each project, site and community. Planning must be community-centric and address multiple objectives whenever possible to ensure that it is embraced by the affected community and becomes a community asset.

Wet weather management strategies are increasingly adding green stormwater practices as part of CSO implementation plans. Gray infrastructure controls include deep tunnel systems, wastewater treatment plant upgrades, in-line storage facilities, relief sewers, pump station upgrades, and treatment/disinfection facilities. Green infrastructure control measures are applied as strategic separation, offloading and stormwater source control practices and should be combined with gray controls to optimize the plan. While green and gray controls have competing design criteria, when layered in over the sewershed, they can effectively manage frequent, low-volume events and reduce the size and complexity of gray controls.

The Metropolitan Sewer District of Greater Cincinnati (MSDGC) is implementing its Wet Weather Improvement Plan through a series of projects or bundles to address CSOs and sanitary sewer overflows (SSOs) in different sections of its service area. Wade Trim is designing improvements for the Upper Duck All Bundle to control overflows in the Duck Creek Watershed including planning and detailed design for an integrated stormwater and CSO management plan. Green infrastructure strategies will be incorporated to reduce CSO volumes in this highly urbanized sewershed.

As part of the City of Omaha’s Long Term Control Plan, a preliminary study of the Leavenworth CSO Basin was conducted to recommend green alternatives that would complement the structural CSO controls identified for two CSO outfalls in the Basin. Stormwater source control Best Management Practices (BMPs) are proposed to reduce the volume of wet weather runoff entering their combined sewer system. Recommendations will be evaluated by the City and its Program Management Team to determine which green solutions will be incorporated into the final Plan.

Integrating natural processes and man-made structures provides a more sustainable approach to managing stormwater. Green infrastructure can reduce the volume of stormwater before it leaves a site, putting less strain on traditional stormwater collection and conveyance systems while providing multiple environmental and community benefits to a site or watershed.

Dave Anthony, RLA, AICP, has 32 years of experience in environmental planning, ecological restoration and landscape architecture. He has evaluated and designed green infrastructure solutions for water resources projects in Cleveland, Cincinnati, Pittsburgh, Detroit, Indianapolis, Omaha and Southwest Florida. He can be reached at danthony@wadetrim.com or 734.947.9700.

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Wade Trim is evaluating green infrastructure opportunities such as using porous pavement and bioretention in this community park to reduce stormwater inflows to the Allegheny County Sanitary Authority’s collection system in Pittsburgh, PA.