Stormwater

July 2008 » PROGRESSIVE ENGINEERING TECHNOLOGY
Evolving best management practices and design and analysis software programs provide civil engineers with an increasing number of options to ensure projects comply with stormwater regulations, as well as green building initiatives.
CE News Staff

Evolving best management practices and design and analysis software programs provide civil engineers with an increasing number of options to ensure projects comply with stormwater regulations, as well as green building initiatives. In response to a request from CE News, companies provided the following information about their products.

Advanced Drainage Systems’ (ADS) Nyloplast surface drainage products combine ductile iron grates with a rugged, heavy-duty PVC structure. The complete product line includes inline drains, drain basins, curb inlet structures, road and highway structures, and drop-in grates. ADS Nyloplast products, which range from 8 inches to 30 inches, feature easy-to-install gasketed push-on joints that, according to the company, provide a watertight seal to protect a drainage system from settlement, vibration, and earth movement.
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Autodesk’s AutoCAD Civil 3D software includes three extensions for stormwater hydraulics and hydrology. Hydraflow Storm Sewers Extension automatically designs pipes, inverts, slopes, and inlets based on user-defined parameters. Hydraflow Hydrographs Extension can be used for site designs, complex watershed modeling, and regional drainage studies, pre- and post-development studies, detention pond design, and submitting agency-ready reports. Hydraflow Express Extension provides flexible calculators for solving a wide variety of hydraulics and hydrology problems for culverts, open channels, inlets, hydrology, and weirs.
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BaySaver Technologies, Inc.’s BayFilter features an up-flow, wrapped spiral design that the company says facilitates influent flow over its entire 43-square-foot surface area, removing more than 80 percent of total suspended solids (TSS) and reducing both turbidity and total phosphorus by 50 percent. Hydraulic pressure forces water through the filter media into a center tube where it discharges through an outlet collection manifold. BayFilter can be deployed in manholes, precast vaults, or cast-in-place structures to treat stormwater at a flow rate of up to 30 gallons per minute.
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Bentley Systems, Inc., says that coupling its Haestad Methods hydrologic and hydraulic analysis and design offering with its family of MicroStation platform-based solutions for roadway and civil site development yields a complete solution for stormwater collection and management that addresses a number of key areas. Functionality includes catchment modeling, sewer capacity verification, stormwater management and regional watershed studies, floodplain delineation, collection system design, and maintenance and operation analysis.
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BOSS International, Inc. enhanced its StormNET software for design and analysis of stormwater and sanitary sewers to incorporate the U.S. Environmental Protection Agency’s SWMM computational engine for easy import and export of XPSWMM files. In addition, StormNET includes numerous hydrology and hydraulic methods that are all accessible through a common graphical interface. Users can change computational methods within the same project and choose the one that is the best fit for the project.
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Clear Water Solutions’ ClearWater BMP stormwater filter features a patent-pending stainless steel filter train design that screens, triple settles, and then filters water flow all within the confines of an existing concrete curb inlet drain box. The filter technology is designed to significantly reduce concentrations of trash, sediment, hydrocarbons, metals, and nutrients. According to the company, tests conducted by San Diego State University determined that the product typically removes 97 percent of TSS, 86 percent of hydrocarbons, 83 percent of zinc, and 81 percent of lead.
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CONTECH Stormwater Solutions says its StormFilter removes fine solids, soluble heavy metals, oil, and total nutrients from stormwater runoff using a variety of sustainable media. Its patented, surface-cleaning system prevents surface blinding, which extends the cartridge life cycle and increases maintenance intervals. From small, pre-fabricated catch basins to large box culvert and panel vaults, StormFilter systems are installed underground, leaving valuable land available for development. The compact design also reduces construction and installation costs by limiting excavation.
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CrystalStream Technologies makes the CrystalClear Polisher, a highly flexible stormwater treatment system that the company says can target fine and dissolved pollutants. The Polisher is designed with sequential filtration panels that adjust to the needs of specific sites and to seasonal variations. This also allows for integration with new filtration and absorption media as technologies evolve. The patented panel design provides an overflow weir to limit flow to the capacity of each medium, and a pressure-relief feature for each panel to adjust for occlusion between cleaning cycles.
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CULTEC, Inc., redesigned its Recharger 330XL stormwater detention/retention chamber to handle greater capacity and be more flexible. The product replaces the 330 model and pushes the storage capacity of the previous design to 52.2 cubic feet/unit, a 12-percent increase. CULTEC extended the chamber three-quarters of a foot and added overlap to strengthen the overall system, making the unit 1 foot longer. Two side portals were also added on each chamber so manifolding could take place at any point within the system, eliminating the need to build external manifolds.
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DHI Water & Environment’s MIKE URBAN uses an ESRI ArcGIS GeoDatabase for storage of all network and catchment data, allowing users to view and edit data with ArcMap or any other compatible application. According to the company, this ensures effortless exchange of data between the models and allows users to maximise productivity and fully leverage their investment in GIS and water modeling software.
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Environment 21’s Triton Stormwater Solutions is lightweight in design, with improved nesting for shipping and quick installation. The chambers can be double-stacked in many applications, thereby reducing the footprint and saving on the cost of land. Although lightweight, the product has been rigorously tested under controlled conditions, the company says.
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The Filterra Bioretention System combines landscape vegetation and specially formulated filter media to naturally remove bacteria, metals, nutrients, and total suspended solids from urban runoff. This urban solution for low-impact development offers a sustainable design, small footprint, and is designed to address both new construction and site retrofits. Plus, according to the company, maintenance is simple, safe, and inexpensive, and the first year is free. Filterra also introduced Bacterra, a specialized blend for 94-percent to 99-percent bacteria removal. Bacterra can decrease sources of bacteria to beaches, reduce public health threats, and achieve water quality goals, according to the company.
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The Hancor HDPE Water Quality Unit is designed with two weir plates to trap oils and suspend solids as stormwater flows through surface drainage structures and into the water quality unit. This structure incorporates a bypass system, which prevents re-suspension of captured solids by diverting water flows greater than first flush. According to Hancor, the durable, lightweight structures have been designed for fast installation and easy maintenance and are resistant to abrasives and chemicals typically found in stormwater and surrounding soils.
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HydroCAD Software Solutions’ HydroCAD Stormwater Modeling software expanded its library of underground storage chambers. The update adds support for more than 100 new chamber models, including the entire line of concrete and CMP storage products from CONTECH Stormwater Solutions. Users can view, compare, and model stormwater chambers from every major chamber manufacturer, as well as get quick sizing estimates or complete hydrograph routing analysis, including exfiltration and outlet calculations.
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Hydro International’s Reg-U-Flo Vortex Valve is a passive device that can be used to control the discharge rate from stormwater detention systems, control the rate of flow into a stormwater or combined sewer system, capture floatable debris, and dissipate the energy of stormwater flows for erosion control. According to the company, the self-activating valve provides better hydraulic performance than a conventional orifice, resulting in as much as a 40-percent reduction in stormwater storage volumes.
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Lane Enterprises developed a Counter Flow Technology (CFT) water quality unit to meet NPDES Phase II permit requirements by treating the first flush of a storm. Lane’s CFT is manufactured from corrugated HDPE pipe and has no mechanical, moving, or replacement parts. By incorporating weir and dividing plates into larger diameter, corrugated HDPE pipes, the CFT re-directs and lengthens the flow travel path to achieve slower velocities and increased settling times. A final chamber removes hydrocarbons and floatable debris before allowing flow back into the storm drainage system.
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Modular Wetlands introduced a hybrid stormwater treatment system—Modular Wetlands System-Linear—that incorporates capture, screening, hydrodynamic separation, filtration, bioretention, and high-flow bypass into a modular, pre-cast concrete structure. According to the company, it removes trash, floatables, oil and grease, sediments, heavy metals, nutrients, and bacteria.
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Permapave Industries, LLC offers Permapave, a natural stone segmental paver engineered to allow water to flow through it while being strong enough for many uses where concrete or asphalt is normally specified. According to the company, Permapave permeable pavers are safe and non-slip for cyclists and pedestrians, even high-heeled shoes. When wet, they provide a safe, non-slip surface for patios, walkways, and other areas. Permapave is used in light-traffic and commercial pedestrian applications. Stormwater flow-through rate is as great as 7 gallons per second per square foot, with the ability to filter out 100 percent of gross pollutants,
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Romtec Utilities, Inc., introduced a 10-foot-diameter, pre-cast concrete wet well, offering greater capacity for stormwater, wastewater, and industrial applications to expand the capacity of its lift station systems. The product also accommodates both duplex and triplex pump systems. With the new size, planners can locate a well in places where deep excavation is impractical, since it can offer the same capacity as a deeper 8-foot-diameter well, but in a shallower design.
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StormChamber offers its StormChamber system, an open-bottom, HDPE infiltration chamber that functions in both permeable and non-permeable soils for sub-surface retention, detention, recharge, and reuse of stormwater. According to the company, it provides a higher level of nutrient and pollutant removal by taking advantage of the natural biological and physical properties of the soil. The SedimenTrap component of the StormChamber system eliminates the need for pre-treatment devices and provides a higher level of sediment and debris removal and retention.
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Stormwater USA’s web-based stormwater training and certification platform is designed to educate professionals to write and inspect stormwater pollution prevention plans (SWPPPs) and construction sites. Programs include Certified Compliance Inspector of Stormwater and Certified Preparer of SWPPP. Stormwater USA’s website also contains up-to-date critical documents to help users stay in compliance with state and federal agencies.
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Streamline Technologies added a utility to its Interconnected Channel and Pond Routing model (ICPR) version 3.10 that uses geometric data provided by manufacturers to calculate stage-area-volume relationships for underground stormwater systems. ICPR is used for a variety of applications, including detention pond design, stormwater management master plans, flood insurance studies, drainage retrofits, and roadway drainage systems.
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Tideflex Technologies’ Curved Bill Tideflex TF-1 Check Valve is constructed entirely of rubber, making it virtually immune to rust, corrosion and weathering. According to the company, the TF-1’s curved bill seals without backpressure, allowing for a tighter seal that eliminates gapping issues. The flexible bill also seals around entrapped debris. The check valve available in sizes as large as 96 inches is most often used for highway runoff, flood control CSO/SSO systems, site drainage, stormwater discharge, sewer systems, coastal discharges, odor control, or any application requiring backflow prevention.
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Transpo Industries, Inc., offers free downloads of "EPA Guidelines for NPDES I & II," a four-page brochure explaining Phase I and II of the NPDES Stormwater Program and reviewing Transpo’s EnviroSafe catch basin inserts. The brochure (136 KB PDF) is available online at www.transpo.com/Transpo_Sheets_PDF/EPA.pdf or by mail.
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UltraTech International, Inc.’s Ultra-HydroKleen is a patented, multiple-media filtration system that removes heavy metals, organically bound metals, hydrocarbons, sediment, and other organics from stormwater and industrial runoff. The sealed filtering system uses interchangeable filtration media. A by-pass feature prevents flooding or ponding during high-flow storm events. Units are available for round or square catch basin grates. Custom sizes are also available.
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InfoWorks SD from Wallingford Software, Inc., models stormwater flows through the typical complex environments with a range of underground and overland structures and paths. It attends to both open channels and closed conduits; every frequently encountered stormwater hydraulic structure can be modeled. An optional fully dynamic 2-D surface flood simulation integrated with the pipe and surface-channel hydraulic simulation is also available. With the option of event-based or real-time continuous simulations, InfoWorks SD is useful in infrastructure design, evaluation projects, and operational use.
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