Stormwater management

July 2007 » PROGRESSIVE ENGINEERING TECHNOLOGY
As the NPDES Phase I permit program approaches its second decade, the range of products for analyzing, modeling, designing, and constructing stormwater management systems for almost any application continues to expand.
CE News Staff

As the National Pollutant Discharge Elimination System (NPDES) Phase I permit program approaches its second decade, the range of products for analyzing, modeling, designing, and constructing stormwater management systems for almost any application continues to expand. In response to a request from CE News, companies provided the following information about their products.

ACO Polymer Products, Inc., offers an updated Technical Handbook and Product Catalog for its ACO Drain product line. The 128-page, full-color catalog covers a number of technical areas encompassing the company’s products and services. Topics include how to choose and specify the correct trench drain system, standard ACO Drain products and accessories and their applications, support services offered by ACO, and product technical and installation information.
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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. According to the company, ADS Nyloplast products, which range from 8 inches to 30 inches, feature easy-to-install, gasketed push-on joints that provide a watertight seal to protect a drainage system from settlement, vibration, and earth movement.
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Filterra Stormwater Bioretention Filtration Systems from Americast are well-suited for the ultra-urban environment with high removal efficiency for many toxic substances, such as petroleum and heavy metals, the company says. Stormwater flows through a filter media mixture contained in a landscaped concrete container. The mixture immobilizes pollutants; those pollutants are then decomposed, volatilized and incorporated into the biomass of the Filterra system’s micro/macro fauna and flora. Stormwater runoff flows through the media and into an underdrain system at the bottom of the container, where the treated water is discharged. Higher flows bypass Filterra via a downstream inlet structure or other appropriate outfall.
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BaySaver Technologies, Inc.’s BayFilter stormwater filtration system is a new, multi-layered underground sand filtration system that removes very fine sediment and nutrient pollutants from stormwater runoff at a flow rate of 30 gallons per minute per cartridge. According to the company, as stormwater makes its way through 43 square feet of surface area per cartridge, BayFilter removes more than 80 percent of total suspended solids (d50=23.2 microns) and more than 50 percent of total phosphorous, including dissolved phosphorus, as well as reducing turbidity 50 percent. The filter’s hydrodynamic backwash self-cleansing component dislodges pollutants and restores the porosity of the media after every storm.
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Bentley Systems, Inc.’s CivilStorm V8 offers users two hydrodynamic engines (Environmental Protection Agency’s SWMM and Haestad Methods’ solution) and three interchangeable and compatible platforms—stand-alone, AutoCAD, and Microstation. CivilStorm V8 also includes support for new unit hydrographs; enhanced water quality features; direct import from EPA’s SWMM and Bentley’s StormCAD; and new element prototypes, query-based selection sets, and user-defined attributes. CivilStorm V8 is available as a free upgrade for CivilStorm SELECT subscribers.
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Bio Clean Environmental Services, Inc., offers a Curb Inlet Basket that uses a patented shelf system to direct water flow into the filtration basket and to position the basket directly under a manhole for easy access and cleaning. A boom captures and retains hydrocarbons, a coarse screen captures foliage and litter, and a fine screen collects sediments. The unit is made from fiberglass and stainless steel.
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CDS Technologies, Inc., says its Stormwater Media Filtration System (MFS), certified by the New Jersey Department of Environmental Protection for removal efficiency of 80 percent of total suspended solids, can treat flow rates from less than 1 cubic foot per second (cfs) to more than 10 cfs. Rechargeable, media-filled cartridges are designed to accept various types of media that can be replaced or exchanged to target and remove specific pollutants, such as heavy metals, oils, and greases, as well as fine gradations of suspended solids. A single-float control assembly activates all media cartridges simultaneously for even hydraulic loading through the entire bed of filter cartridges.
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Clear Water Solutions’ ClearWater BMP stormwater filter screens, triple settles, and then filters stormwater flows within the confines of an existing concrete curb inlet drain box. According to the company, the device removes 97 percent of total suspended solids, 86 percent of hydrocarbons, 83 percent of zinc, and 81 percent of lead. The ClearWater BMP is designed for retrofitting within the existing curb and gutter infrastructure without excavation or concrete modification.
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EnkaRetain & Drain is a new product developed by Colbond, Inc., that combines a super absorbent, nonwoven filter fabric bonded to a 3-D Enkadrain 3000R series drainage core for use primarily in green roof and planter applications. The Enkadrain drainage core, made of post-industrial, recycled polypropylene molded into a square, waffle pattern, allows water to flow from all directions. A water-retention fabric bonded to one surface and replacing traditional filter fabric holds 10 times its weight in water. Its function is to absorb and retain water so plant roots have a continuous source of moisture while allowing excess water to filter through and drain.
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CONTECH Stormwater Solutions Inc., introduced the VortSentry HS system, a hydrodynamic separator using a helical flow pattern that the company says enhances trapping and containment of settleable solids and floating pollutants from stormwater runoff. The VortSentry HS can be used as a standalone best management practice or as a pre-treatment system in conjunction with other stormwater treatment devices. The unit’s design prevents adverse velocities or turbulence in the treatment chamber, which helps prevent washout of previously captured pollutants. Engineered in a concrete manhole, the VortSentry HS uses standard materials and stockable components and is available in both inline and grate inlet configurations.
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CULTEC, Inc., offers the HVLV 180 and V8 Header Systems designed to work with the company’s line of Recharger 180, 280, 330, and V8 plastic stormwater chambers. The HVLV systems are used as replacements for conventional pipe manifold systems in stormwater applications. The HVLV 180 and V8 Header Systems are a combination of interlocking plastic chamber-type sections. As stormwater runoff travels through the HVLV system, side portals make tee connections and convey the water into CULTEC’s plastic stormwater chambers. Runoff is then stored until it can be either infiltrated or dispelled.
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Hancor, Inc.’s LandMax stormwater retention/detention systems are made with a series of high-density polyethylene (HDPE) pipes connected side-by-side in a subsurface structure. According to Hancor, the availability of pipe in diameters as large as 60 inches makes the system a versatile BMP for managing stormwater quality and quantity. LandMax systems increase the amount of usable land because some facilities, such as parking lots and playgrounds, can be built over them. LandMax subsurface systems also decrease safety risks because they are inaccessible to the public, are more easily maintained, and are options in situations where a high groundwater table or small lot size make a pond impractical.
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HydroCAD Stormwater Modeling from HydroCAD Software Solutions, LLC, handles design of all types of stormwater storage, including surface ponds, pipe storage, and prefabricated storage chambers set in a stone bed. Outlet controls include traditional orifice, weir, and culvert calculations, plus exfiltration and specialized devices such as vortex valves. Runoff hydrographs can be generated by the SCS/NRCS, SBUH, or Rational methods, with advanced routing capabilities including automatic tailwater, interconnected ponds, and Muskingum-Cunge reach routing. All operations are managed by an on-screen routing diagram.
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Imbrium Systems, creator of the Stormceptor, released PCSWMM software for sizing the Stormceptor, which is available in the United States through Rinker Materials. Based on the U.S. EPA’s Storm Water Management Model (SWMM), PCSWMM for Stormceptor takes the simulation model further, using site conditions and extensive historical rainfall to determine the best stormwater quality system for a site. The program provides recent and historical data from 1,900 weather stations across North America and works with specific site conditions, including a variety of particle size distributions
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Hydraflow Express software, offered by Intelisolve, is designed to solve hydraulics and hydrology problems. Users select a task from a tool bar, fill in blanks on an input grid, and click a button to generate graphs, rating curves, and reports. Among other functions, the program models and designs culverts with circular, box, elliptical, and arch shapes; computes normal-depth rating curves for rectangular, trapezoidal, triangular, compound gutter, circular, and user-defined channel shapes; and calculates hydraulics for six inlet types, including curb, grate, combination, drop curb, drop grate, and slotted. HydraFlow Express supports SCS, Rational, and Modified Rational methods for computing runoff hydrographs.
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North American Green’s Erosion Control Materials Design Software (ECMDS) Version 4.3 provides computer-assisted selection of materials for slope erosion protection and channel scour resistance. According to the company, recommendations within ECMDS are based on data from laboratory and field research involving erosion control blankets, turf reinforcement mats (TRM), vegetation, TRM-reinforced vegetation, and riprap. The program uses design procedures developed by the U.S. Department of Agriculture and the Federal Highway Administration. ECMDS also provides viewable and printable back-up computations to support the analysis output.
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Permapave Permeable Pavers from Permapave Industries, LLC, are made from natural stone and have a flow-through rate of as much as 7.5 gallons per second per square foot, the company says, removing 100 percent of gross pollutants from stormwater as it passes through the substrate. The paver system contains an underlying stone reservoir that stores surface runoff until it infiltrates into the soil. Permeable Pavers can withstand light traffic, such as in car parking lots and driveways. When bedded in gravel and grouted with polymer concrete, they provide non-slip surfaces for pedestrians and cyclists.
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According to Profile Products, LLC, its Terra-Tubes Fiber Filtration Tubes effectively trap, filter, and treat sediment-laden runoff while reducing hydraulic energy. Terra-Tubes are engineered composites of wood fibers, man-made fibers, and performance-enhancing polymers encased in heavy-duty, knitted tubes. The filtration medium is available as a polymer delivery system or as stand-alone, high-performance fiber tubes for specific applications that include slope interruption devices, channel flow checks, drain inlet protection, and perimeter sediment control.
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Red Valve Company, Inc.’s large-diameter pinch valves, used in collection systems, interceptors, influent flow control, and flow equalization, can control and isolate sanitary and stormwater flows. According to the company, the valves are ideal for control strategies to minimize combined sewer overflow volume and frequency because they use real-time control. Combined sanitary and stormwater flow can be stored within the pipeline and later released to the treatment plant at a controlled rate for processing. The valves are available in sizes as large as 96 inches.
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Ringer Industrial Group’s EZflow drainage products comprise flexible, slotted pipe surrounded by engineered polystyrene aggregate and enclosed in woven geotextile mesh. EZflow is available in 10-foot-long sections for use in foundation drainage, French drains, retaining wall drains, interceptor drains, and roof runoff drains. According to the company, engineered flow channels in the aggregate provide five times the flow rate of gravel without gravel fines, and it can withstand H-10 vehicle loading. Available pipe sizes range from 3 inches to 14 inches.
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Roscoe Moss Company offers Storm Flo Screen for removing solids from stormwater. Developed to assist agencies comply with trash total maximum daily loads established in Los Angeles, Storm Flo Screen captures debris and reduces maintenance of stormwater transmission and detention facilities. The linear radial device has been successfully tested and is certified as a full-capture system. Storm Flo Screen is manufactured in diameters and lengths to treat a wide range of hydraulic conditions and debris loads.
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Scientific Software Group’s MIDUSS is an interactive program for stormwater management, design, and analysis. According to the company, quick feedback allows users to judge the suitability of a network element, then tweak its performance or try to reduce its size to save costs. In automatic mode, the simulation process allows momentary stopping of the simulation to correct or analyze a particular part of the design. Once reviewed, the simulation continues to the end of the design.
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Seaman Corporation’s XR-5 and XR-3 geomembranes can be used to line stormwater detention ponds. The liners withstand UV exposure, are chemically resistant, puncture resistant, and do not require soil cover. Field panels are available as wide as 100 feet. XR-5 is resistant to hydrocarbons, acids, methane, and a broad range of petrochemicals; XR-3 is designed for standard stormwater applications.
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According to Setra Systems, Inc., its new Model 595 digitally compensated, submersible pressure transducer is ideal for stormwater studies, stream flow monitoring, infiltration/inflow studies, pump tests, and flood warning applications. The Model 595 is offered with a choice of two-wire/4 to 20 mA (for use with non-communication data recorders), SDI-12 with 4 to 20 mA, RS485, or SDI-12 output. The SDI-12 communication version offers minimal current draw for battery-powered operation. The SDI-12 and RS485 versions allow remote calibration via cable from a PC or hand-held interface.
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Stormdrain Solutions’ Inceptor is a pollution-prevention device that suspends within any catch basin or storm drain inlet to treat runoff from parking lots, roads, and other impervious surfaces. The Inceptor comprises a stainless steel housing with a PolyDak filter composed of thermoplastic synthetic fibers that, according to the company, coalesces hydrocarbons, PCBs, lead, copper, zinc, chromium VI, and other heavy metals; and removes more than 90 percent of suspended solids greater than 40 microns. The unit requires biannual replacement of the PolyDak filter. Stormdrain Solutions can manufacture the Inceptor to fit any catch basin or inlet dimension.
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StormTech, LLC’s underground stormwater chambers are made from injection-molded polypropylene in a corrugated arch design that the company says provides structural integrity under H-20 live loads and deep burial loads. Chamber length can be cut in 6.5-inch increments to optimize available space and reduce waste. A patent-pending Isolator Row technique enhances removal of total suspended solids and provides access for inspection and maintenance. The 34-inch-wide by 16-inch-high SC-310 chamber provides 14.7 cubic feet of storage; the 51-inch-wide by 30-inch-high SC-740 chamber provides 45.9 cubic feet of storage.
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StormTrap’s modular, precast concrete, underground stormwater detention system is custom made to meet each site’s characteristics. The system is available in two configurations—Single Trap and Double Trap—with either large infiltrative surfaces that allow water to recharge into the underlying soil, or completely contained, water-tight reservoirs. Single Trap systems are available in heights from 1 foot 2 inches to 5 feet; Double Trap heights range from 2 feet 4 inches to 10 feet.
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Transpo Industries, Inc., installed 45 EnviroSafe Modular Stormwater Catch Basin Filtration Systems at Veterans Memorial Park in Norwalk, Conn., under a grant from the National Fish and Wildlife Foundation. EnviroSafe is designed to fit into existing stormwater drains to capture and filter many pollutants common to stormwater runoff, including trash, debris, sediments, oils, grease, and soluble metals. The filtering technology incorporates an antimicrobial treatment that inhibits bacteria, virus, and mold growth.
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The U.S. Environmental Protection Agency released a new version of its watershed management program. Better Assessment Science Integrating Point and Nonpoint Sources (BASINS) 4.0 is a multipurpose system that integrates environmental data, analytical tools, and modeling programs for watershed and water quality-based analyses, including developing total maximum daily load allocations. Unlike earlier releases, BASINS 4.0 runs on non-proprietary, open-source, free geographic information system software. Once installed on a personal computer, BASINS 4.0 gives users access to detailed point and non-point source data, which they can use to assess or predict flow and water quality for selected streams or entire watersheds.
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Varicore Technologies recently published an updated Multi-Flow drainage system product catalog describing and illustrating the panel-shaped drainage system and its components. Sixty-five system components are featured, demonstrating the versatility of the system. Vertical and horizontal applications can be accommodated. Applications include drainage of natural and synthetic athletic fields, playgrounds, landscapes, roads, and golf courses. This catalog includes two new transport connectors—Corru-Taps and Rigi-Taps—that connect Multi-Flow collector lines to round pipe transport lines.
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InfoWorks SD (IWSD) is a new, fully dynamic, network hydraulic modeling software solution from Wallingford Software. IWSD incorporates comprehensive modeling of stormwater structures; rapid and greenfield infiltration and inflow; future scenario analysis, as well as existing network simulation; integrated flood mapping to generate a visual representation of surface flood depths; optional, fully-dynamic, 2-D surface flood simulation, integrated with the pipe and surface-channel hydraulic simulation; modeling of BMP design, construction, and maintenance practices and criteria for stormwater facilities; and simulation of control structures and control logic (real-time control). According to Wallingford, every frequently encountered stormwater hydraulic structure is modeled in IWSD.
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XP Software says its xpstorm-2D integrates TUFLOW, a program developed by WBM Oceanics specifically for establishing the flow patterns of coastal waters, estuaries, rivers, and urban areas where the flow patterns are essentially 2-D in nature. The software can dynamically link to a 1-D channel hydraulics model with a 2-D overland flow model in an integrated fashion, providing a comprehensive perspective of the effects of flooding on stormwater systems. It generates flow hydrographs, flood levels, and pollutant loads or concentrations and analyzes water quality control devices. Additionally, xpstorm-2D can produce animated flood maps demonstrating water movement and flood levels over terrain and aerial photograph backgrounds.
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