Introduction to the Methodology of Creating a Model using InfoSWMM or InfoSWMM SA

Introduction to the Methodology of Creating a Model using InfoSWMM or InfoSWMM SA

InfoSWMM and InfoSWMM SA is a comprehensive GIS-centric, highly advanced hydrologic, hydraulic, and water quality simulation model that could be used for the management of urban stormwater and wastewater collection systems. InfoSWMM and InfoSWMM SA represents the state-of-the-art in GIS-based sanitary and storm sewer collection systems analysis. The program provides scores of cutting edge simulation capabilities for performing a wide variety of essential modeling tasks in record time. It helps engineers predict the response of the sewer collection system to various flow loads and physical conditions.

Physical Components Non-Physical Components
Hydraulic Simulation (Transport) Model Water Quality Modeling
Stormwater Modeling Sewer Modeling

InfoSWMM InfoSWMM SA is a fully dynamic wastewater and stormwater modeling and management software application. InfoSWMM InfoSWMM SA can be used to model the entire land phase of the hydrologic cycle as applied to urban stormwater and wastewater collection systems. The model can perform single event or long-term (continuous) rainfall-runoff simulations accounting for climate, soil, land use, and topographic conditions of the watershed. In addition to simulating runoff quantity ,InfoSWMM InfoSWMM SA can also predict runoff quality including buildup and washoff of pollutants from primarily urban watersheds. Once runoff quantity and quality is simulated, and wastewater loads at receiving nodes are determined, the routing portion of InfoSWMM InfoSWMM SA transports using either steady flow routing, kinematic wave routing or dynamic wave routing, the flow through a conveyance system of pipes, channels, storage/treatment devices, pumps, and hydraulic regulators such as weirs and orifices. The model offers advanced Real-Time Control (RTC) scheme for the operational management of hydraulic structures.

This section describes how InfoSWMM InfoSWMM SA models the physical objects composing a sewer collection system as well as its operational parameters and the computational methods used to simulate its hydrologic, hydraulic, and water quality behaviors.


InfoSWMM InfoSWMM SA conceptualizes a drainage system as a series of water and material flows between several major environmental compartments. These compartments and the InfoSWMM InfoSWMM SA objects they contain include:

· The Atmosphere compartment, from which precipitation falls and pollutants are deposited onto the land surface compartment. InfoSWMM InfoSWMM SAuses Rain Gage objects to represent rainfall inputs to the system.

· The Land Surface compartment, which is represented through one or more Subcatchment objects. It receives precipitation from the Atmospheric compartment in the form of rain or snow; it sends outflow in the form of infiltration to the Groundwater compartment and also as surface runoff and pollutant loadings to the Transportcompartment.

· The Groundwater compartment receives infiltration from the Land Surface compartment and transfers a portion of this inflow to the Transport compartment. This compartment is modeled using Aquifer objects.

· The Transport compartment contains a network of conveyance elements (channels, pipes, pumps, and regulators) and storage/treatment units that transport water to outfalls or to treatment facilities. Inflows to this compartment can come from surface runoff, groundwater interflow, sanitary dry weather flow, or from user-defined hydrographs. The components of the Transport compartment are modeled with Node and Link objects.

Not all compartments need to appear in a particular InfoSWMM InfoSWMM SA model. For example, one could model just the transport compartment, using pre-defined hydrographs as inputs.

The Three Main Components are:

1. Arc Map Table of Contents (TOC),

2. InfoSWMM Menus

3. InfoSWMM Attribute Browser (AB)

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