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StormNET® is the most advanced, powerful, and comprehensive stormwater and wastewater modeling software available for analyzing and designing urban drainage systems, stormwater sewers, and sanitary sewers. StormNET is the only model that combines complex hydrology, hydraulics, and water quality in a completely graphical, easy-to-use interface.

StormNET is a fully-dynamic hydrology and hydraulic model that can analyze both simple and complex stormwater systems. StormNET can be used for:

• Highway drainage systems (including curb and gutter inlets)
• Stormwater sewer networks and interconnected detention ponds
• Subdivision drainage design
• Automatic sizing and designing of detention ponds and outlet structures
• Bridge and culvert modeling, including roadway overtopping
• Water quality studies
• Sanitary sewers, lift station design, CSO’s, and SSO’s

StormNET is the only model that combines complex hydrology, hydraulics, and water quality in a completely graphical, easy-to-use interface. Both US and metric (SI) units are supported.

StormNET is easy to learn and use. StormNET models can be quickly developed using a variety of different sources. For example, network components can be directly imported from AutoCAD, MicroStation, and ArcGIS, and can be interactively created using a mouse by simply pointing and clicking. Or, develop and analyze your entire stormwater network model within AutoCAD Civil 3D using the StormNET Civil 3D version. Graphical symbols are used to represent network elements such as manholes, pipes, pumps, weirs, ditches, channels, and detention ponds. StormNET allows you, at any time, to interactively add, insert, delete, or move any network element, automatically updating the model. For example, selecting and moving a manhole automatically moves all connected pipes, ditches, channels, and pumps.

Pipes can be curvilinear and lengths automatically computed. Scanned aerial orthophoto TIFF images and maps; Mr. SID high-resolution orthophotos; ArcGIS, AutoCAD, and MicroStation files of streets, parcels, and buildings can be imported and displayed as a background image. This feature allows the user to quickly digitize a network model, confirm the network layout, or simply enhance the output modeling results. Moreover, the user can point to or click on any network manhole, pipe, pump, weir, ditch, channel, or detention pond from the horizontal plan view to quickly determine the defined input data and output modeling results.

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StormNET provides a variety of modeling elements to select from:

• Watershed subbasins
• Inlets and catch basins
• Detention ponds
• Complex outlet structures
• Standpipes, weirs, and orifices
• Stormwater and wastewater sewers
• Pumps and lift stations
• Manholes and junctions
• Rivers, streams, and ditches
• Culverts and bridges

StormNET is a link-node based model that performs hydrology, hydraulic, and water quality analysis of stormwater and wastewater drainage systems, including sewage treatment plants and water quality control devices. A link represents a hydraulic element (i.e., a pipe, channel, pump, standpipe, culvert, or weir) that transports flow and constituents. There are numerous different link element types supported by StormNET. A node can represent the junction of two or more links, the location of a flow or pollutant input into the system, or as a storage element such as a detention pond, retention pond, settling pond, or lake.

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StormNET is approved by FEMA and all state and federal government agencies. StormNET’s SWMM analysis engine is a collaborative effort between Camp Dresser & McKee (CDM) and the U.S. Environmental Protection Agency (EPA). SWMM is the most widely applied stormwater and wastewater model in North America, with universal acceptance in the North American regulatory community and a dedicated SWMM user community that numbers in the thousands. CDM was one of the initial developers of SWMM, and has continued to support and enhance the engine over the years in conjunction with the EPA.

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StormNET includes the following hydrology models to determine drainage area runoff:

• USEPA SWMM 5.0 (imports XPSWMM™ v10.52 and EPA SWMM v4.4 and earlier)
• NRCS (SCS) TR-55
• NRCS (SCS) TR-20
• Rational Method
• Modified Rational Method
• DeKalb Rational Method
• Santa Barbara Unit Hydrograph
• Delmarva Unit Hydrograph
• Long-Term Continuous Simulation
• Maricopa & Pima Counties (Arizona) Papadakis-Kazan methodology
• Harris County (Texas) Method
• LA County MODRAT2 and F0601 (in development)
• CUHP Colorado Urban Hydrograph Procedure (in development)
• WWHM Western Washington Hydrology Model (in development)
• HEC-1 (in development)
• HEC-HMS (in development)
• And more…

StormNET accounts for various hydrologic processes that produce runoff from urban areas, including:

• Time-varying rainfall
• Evaporation of standing surface water
• Snow accumulation and melting
• Rainfall interception from depression storage
• Infiltration of rainfall into unsaturated soil layers
• Percolation of infiltrated water into groundwater layers
• Interflow between groundwater and the drainage system
• Nonlinear reservoir routing of overland flow

Spatial variability in all of these processes is achieved by dividing a study area into a collection of smaller, homogeneous subcatchment areas, each containing its own fraction of pervious and impervious sub-areas. Overland flow can be routed between sub-areas, between subcatchments, or between entry points of a drainage system.

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StormNET includes a Rainfall Designer which allows the user to select any location within the USA and it will provide the design rainfall for the specified storm frequency. Alternatively, a user-defined rainfall can be specified. Then the appropriate storm distribution can be selected and the design storm is then created. Multiple design storms can be created and analyzed.

• Automatically determine design rainfall (based upon study location) for 1, 2, 5, 10, 25, 50, and 100 year return frequencies
• Define any storm duration, multiple storm events
• Numerous storm distributions, including SCS, Huff, Eastern Washington, Florida, Chicago Storm, Hurricane Hazel, etc.

Compare StormNET to other hydrology software to see how it "stacks up."

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Download a free trial version of StormNET software and support utilities.

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Request a free CD-ROM containing the complete StormNET software, along with tutorials and user documentation.

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Included with StormNET is an integrated Hydraulic & Hydrology (H&H) Toolbox, allowing you quick access to standard hydraulic and hydrology calculations. The H&H Toolbox makes it easier than ever to quickly perform engineering computations that drainage engineers commonly run into. Capabilities include:

• Design and analyze detention pond discharge structures, including compound weirs, multi-port risers, orifices, etc.
• Design outlet discharge aprons
• Design and size culverts, pipes, ditches, open channels
• Design and size stormwater inlets
• Design riprap protection
• And much more…

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StormNET’s advanced features and capabilities include:

• Easy to use graphical interface
• Integration with AutoCAD and GIS
• Automatically construct network sewer models from AutoCAD and MicroStation drawings, GIS geodatabases
• Operate directly within AutoCAD Civil 3D with StormNET Civil 3D version
• Linkage to LandXML and GIS shapefiles
• Automatic Detention Pond Sizer and Pond Designer
• Size and design a pond and corresponding outlet structure in minutes
• Account for basin infiltration
• Model subsurface vaults or systems of large diameter interconnected storage pipes, arched pipes, or manufactured storage chambers
• Rainfall Designer
• Automatically determine design rainfall (based upon study location) for 1, 2, 5, 10, 25, 50, and 100 year return frequencies using StormNET’s site-specific storm distribution database with over 3,500 up-to-date rainfall recording stations across North America
• Define any storm duration, multiple storm events
• Numerous storm distributions, including SCS, Huff, Eastern Washington, Florida, Chicago Storm, Hurricane Hazel, etc.
• Account for complex flow conditions, including:
• Subcritical, critical, and supercritical flow regimes
• Gravity and pressurized flow
• Flow reversals
• Flow splits and combines
• Branched, dendritic, and looped systems
• Tailwater submergence effects
• Interconnected ponds
• Tidal outfalls
• More…
• Account for head losses, including:
• Entrance losses
• Exit losses
• Friction losses
• Bend losses
• Drop losses

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StormNET provides you with all the tools necessary to perform your urban stormwater water quality modeling.

• Account for rain gardens, green roofs, rain barrels, bioswales, dry detention ponds, wet ponds, retention ponds, wetlands, and more
• Model particulate settling, water cleanup, water quality best management practices (BMP), and TMDL (Total Maximum Daily Loads)
• StormNET is approved by the US Environmental Protection Agency (EPA) and US Federal Emergency Management Authority (FEMA)

The following processes can be modeled for any number of user-defined water quality constituents:

• Dry-weather pollutant buildup over different land uses
• Pollutant washoff from specific land uses during storm events
• Direct contribution of rainfall deposition
• Reduction in dry-weather buildup due to street cleaning
• Reduction in washoff load due to BMPs
• Entry of dry weather sanitary flows and user-specified external inflows at any point in the drainage system
• Routing of water quality constituents through the drainage system
• Reduction in constituent concentration through treatment in storage units or by natural processes in pipes and channels

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StormNET’s base engine has been used in thousands of sewer and stormwater studies throughout the world. Typical applications include:

• Design and sizing of drainage system components for flood control
• Design and sizing of detention facilities for flood control and water quality protection
• Floodplain mapping of natural channel systems
• Designing control strategies for minimizing combined sewer overflows (CSO)
• Evaluating the impact of inflow and infiltration on sanitary sewer overflows (SSO)
• Generating non-point source pollutant loadings for waste load allocation studies
• Evaluating the effectiveness of BMPs for reducing wet weather pollutant loadings

StormNET provides both kinematic wave and full hydrodynamic wave routing for performing hydraulic analysis. Kinematic wave routing provides a non-linear reservoir formulation for channels and pipes, including translation and attenuation effects that assume the water surface is parallel to the invert slope. This method cannot simulate backwater or reverse flow. Dynamic wave routing solves the complete St. Venant equations throughout the drainage network and includes modeling of backwater effects, flow reversal, surcharging, looped connections, pressure flow, tidal outfalls, and interconnected ponds. Flow can also be routed through a variety of different storage elements, such as detention ponds, settling ponds, and lakes.

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StormNET’s graphical capabilities are unparalleled, providing horizontal plan plots, profile plots, and time series plots. On the horizontal plan plot, StormNET provides automatic color-coding of links and nodes based upon any input or output property, allowing the network to be color-coded based upon pipe sizes, flow rates, velocities, hydraulic grades, water quality concentrations, or any other attribute. Directional flow arrows can be plotted alongside the pipes to show the flow direction for any time step. Furthermore, pipes can be plotted with variable width and nodes with variable radius, allowing the user to quickly identify those areas of the network experiencing the most surcharge, flow, pollutant concentration, etc.

StormNET will automatically generate graphical animations for both horizontal plan plots and profile plots which show values that change with respect to time. Multiple animations can be performed simultaneously, allowing the user to plot several different profiles and watch all the results along that profile line, each in a separate window. Displays of multiple animation views are automatically synchronized.

Multiple time-series plots can be generated for various network elements, such as pipe flow, velocity, pollutant concentration, and loading. In addition, StormNET allows the user to display and compare multiple result files simultaneously as either horizontal plan plots, profile plots, or time-series plots. This allows direct comparison between different simulation models.

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StormNET can share spatial data and visual representation of the stormwater and wastewater sewer network with any ArcGIS or MapInfo GIS database, allowing StormNET to be part of the stormwater and wastewater management and planning system. These capabilities can greatly assist in the decision-making processes for network asset inventory, rehabilitation requirements, and financial planning. StormNET can intelligently build a link to any GIS database structure, using attribute mapping and geocoding. For example, a manhole and sewer pipe can be represented as a node and arc in the originating GIS database while still being linked with StormNET. Also, StormNET solution results can be posted back to the original GIS database, allowing locations of CSO and SSO points, manhole overflows, pipe surcharging, and floodplain flooding to be quickly identified.

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StormNET uses the Microsoft Access database engine for storing and manipulating network data. This provides unlimited flexibility for defining and modifying the network data. For example, you can perform QBE (Query By Example) and/or SQL (Structured Query Language) database queries to select those pipes having a specific diameter, shape, roughness, etc. and then make global changes to this selected data. Database query results can be displayed graphically (by highlighting the selected elements in the horizontal plan view), in tabular format, printed, or copied to other applications using the Windows clipboard. This same query facility can be used for visualization of computational results such as pipe flows, water surface elevations, water quality concentrations, etc.

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Comprehensive, easy-to-read input data and output analysis reports can be automatically generated using the provided drainage report templates, which include a comprehensive table of contents and an index. StormNET’s integrated report generator allows full customization of reports to any level of detail in order to meet reviewing agency requirements. This allows unlimited flexibility and functionality in developing specialized user-defined reports ranging from executive summaries to comprehensive drainage reports. These reports can be fully customized to meet any combination of modeling criteria. For example, users can specify network variables, time periods, or simply add a corporate logo. Furthermore, due to StormNET’s open-architecture Microsoft Access database, nearly any other reporting tool can be used to generate reports.

Included report items include:

• Composite curve number computations
• Time of concentration computations
• Surcharging of pipes
• Overflow of manholes
• Detention pond design report
• Etc…

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Included with StormNET is a built-in Model Checker. The Model Checker will review the input data specified for the selected analysis model. If it encounters an error with the input data, it will explain what is wrong and how you can correct it. The Model Checker can be thought of as an expert modeler, pointing out any errors contained within the model.