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Input Parameters
User’s Manual » Features » Tool Bar » Simulation » Simulation – Output » Input Parameters
Once a run is created and added under the Runs group in the Project Manager, click the Input Parameters button to open a new tab and view the model input file in a text-file format. Context Menu for Input Parameters Right click on the opened Input Parameters tab…
VO-SWMM Support
User’s Manual » VO-SWMM Support
VO-SWMM has a comprehensive Help System and supporting documentation that will assist both beginners and advanced users. The primary goal in designing this Help System was to empower users with the tools and information so that almost every question can be answered in…
Installing VO-SWMM
User’s Manual » Installing VO-SWMM
Follow the requirements and steps to install VO on your computer. Hardware and Software Requirements Licensing System Installing VO Running VO Uninstalling VO
C. Installing VO-SWMM
User’s Manual » Installing VO-SWMM » C. Installing VO-SWMM
Before installing VO, make sure that you have closed all other programs and that any virus protection software is disabled. A connection to the cloud server is required for the cloud license system to work. These 2 TCP ports MUST be open for outgoing connections on…
D. Running VO-SWMM
User’s Manual » Installing VO-SWMM » D. Running VO-SWMM
To start VO-SWMM, simply double-click on the VO desktop icon or find the VO item from your Start menu. Once VO-SWMM starts, you will first see the splash screen as below Then, you will see the main window. You may see the main window as below, which is used for…
E. Uninstall VO-SWMM
User’s Manual » Installing VO-SWMM » E. Uninstall VO-SWMM
You may be required to uninstall VO-SWMM in the future. The following procedure should be followed to uninstall VO-SWMM from your system: Launch Control Panel and double-click Add/Remove Programs. Scroll down the list until you find VO. Select item and click OK…
System Representation in SWMM: A Comprehensive Overview
Practical Example of VOSWMM for Students » 6. Runoff Treatment » System Representation in SWMM: A Comprehensive Overview
Water Quality Treatment in LIDs In line with Example 4, we treat the filter strip and infiltration trench LIDs as subcatchments to account for their combined impact on storm runoff, including pollutant reduction. While there aren’t well-established models for…
System Representation in SWMM: A Comprehensive Overview
Practical Example of VOSWMM for Students » 1. Post-Development Runoff » System Representation in SWMM: A Comprehensive Overview
SWMM is a distributed model designed to intricately analyze runoff generation within diverse landscapes. This involves subdividing study areas into irregular subcatchments to effectively account for spatial variations in topography, drainage patterns, land cover, and…
System Representation in SWMM: A Comprehensive Overview
Practical Example of VOSWMM for Students » 2. Surface Drainage Hydraulics » System Representation in SWMM: A Comprehensive Overview
SWMM functions by representing a conveyance network through a series of interconnected nodes and links. These links control the flow rate between nodes and can include conduits like open channels, pipes, or other elements such as orifices, weirs, and pumps. Nodes…
System Representation in SWMM: A Comprehensive Overview
Practical Example of VOSWMM for Students » 3. Detention Pond Design » System Representation in SWMM: A Comprehensive Overview
Designing SWMM detention ponds involves key elements: storage units, orifices, and weirs. These components are detailed below: 1. Storage Units: Storage units in SWMM are nodes, distinct from Example 2’s junction nodes. They utilize a Storage Curve to describe…
System Representation in SWMM: A Comprehensive Overview
Practical Example of VOSWMM for Students » 4. Low Impact Development » System Representation in SWMM: A Comprehensive Overview
Filter Strips Filter strips are grassy areas where runoff flows in a thin sheet. They’re not great at reducing peak flows but work well at removing solid pollutants during small storms (< 1 year). They’re most effective on gentle slopes (less than 5%) and…
System Representation in SWMM: A Comprehensive Overview
Practical Example of VOSWMM for Students » 5. Runoff Water Quality » System Representation in SWMM: A Comprehensive Overview
VOSWMM uses different tools and methods to model urban runoff water quality. Calibration data is essential for realistic results. Here’s a brief overview of how VOSWMM handles water quality. Pollutants Pollutants, which are user-defined contaminants, accumulate…
7.2.1 Rainfall Input
Reference Guide » 7 Design Storms for Stormwater Management Studies » 7.2 Methodology for Comparing Design Storms and a Historical Storm Series » 7.2.1 Rainfall Input
The rainfall inputs used with the event simulation models were a historical storm series and two design storms. The historical storm series was selected from the Bloor Street station rainfall record. A criteria was selected based on the storm volume and intensity so…
3.3 Common Parameters
VO-SWMM » 3 Conceptual Model » 3.3 Common Parameters
Some parameters are available for all or most of the hydrologic objects. These parameters are given in Table 3-2. TABLE 3-2 COMMON HYDROLOGIC OBJECT PARAMETERS Parameter Name Description Default Value Applicable Hydrologic Object NHYD…
3.9.1 Common Parameters
VO-SWMM » 3 Conceptual Model » 3.9 Low Impact Development (LID) » 3.9.1 Common Parameters
LID parameters have been set based on the 2010 Low Impact Development Stormwater Management Planning and Design Guide. Certain parameters are available for most LIDs. These parameters are given in Table 3-11. TABLE 3-11 LIDs COMMON PARAMETERS Parameter Name…
Object Parameters and Results
User’s Manual » Features » Object Parameters and Results
Users can view/edit parameters by two ways: Properties tab: By default, Properties tab is place on the right of VOSWMM main interface next to the Project Manager tab. Parameter tables. By default, Parameter Tables are placed at the bottom of VOSWMM main…
New Manual Input Design Storm
User’s Manual » Features » Tool Bar » Simulation » Simulation – Data » Resource Library » New Design Storm » New Manual Input Design Storm
To create a design storm manually, click the Manual Input button. In the Basic Information section, type Name and choose the Unit. In the Time Series table, type in the time and data.
2.3 Parameters for the Pervious Component
Reference Guide » 2 Tips for Modeling Ungauged Urban Catchments » 2.3 Parameters for the Pervious Component
The pervious slope, SLPP, is the average slope of the pervious areas. This is not the catchment slope from highest point to lowest point, but an average when considering only the pervious are-as. For example, if the catchment consists of a residential subdivision,…
Simulation
User’s Manual » Features » Tool Bar » Simulation
The Simulation tab includes tools mainly for setting up and running simulations, viewing and analyzing results, and managing database that will be used in the model. Simmulation Tab Icon Command Description Icon Command Description…
4.3.2 Importing SWMM5
VO-SWMM » 4 Working Projects and Scenarios » 4.3 Importing Scenarios from Model Data Files » 4.3.2 Importing SWMM5
The catchment and channel systems in SWMM can be imported to VO. The subcatchments are converted to either NasHyd or StandHyd based on the imperviousness and the open channel is converted to RouteChannel. It is not recommended to import models with detailed sewer…
Step 7: Undeveloped Site – Set up Analysis Option and Run Simulation
Tutorials » Post-Development Runoff » Step 7: Undeveloped Site – Set up Analysis Option and Run Simulation
Table 1-3 (SWMM Application Manual, EPA, Sept. 2016) shows the analysis options used to run the model. The Flow Unit was set in Step 2: Create a New VOSWMM Project. The other analysis options in the table above can be set in Run Options and SWMM Options…
Editing a Group of Objects
User’s Manual » Features » Object Parameters and Results » Properties Tab » Editing a Group of Objects
There are several ways to select multiple objects: Select on Schematic/Map View Select on Parameter Tables Select on Result Summary Tables The common fields of those selected objects will be listed in Properties tab. On the top of Properties tab shows the number…
Simulation – Run and Options
User’s Manual » Features » Tool Bar » Simulation » Simulation – Run and Options
The tools in the Simulation section in Simulation toolbar are used to perform simulation run, set default parameters and set engine settings. Icon Function Run Default Values Engine Options…
Summary
Post-Development Runoff (backup) » Summary
This example used SWMM to estimate the runoff response to different rain events for a 29 ac development that will be built in a natural area. Comparisons were made between the runoff peaks and total volume for each event for both pre- and post-developed conditions. The…
New Chicago Design Storm
User’s Manual » Features » Tool Bar » Simulation » Simulation – Data » Resource Library » New Design Storm » New Chicago Design Storm
To add a new Chicago design storm, click the Chicago button. A default Chicago design storm will be added and shown in the main view with its Basic Information, parameters of A, B, C, and Time Series table and graph. The parameters of A, B, C can also be copied…
Import and Export VOSWMM Models
User’s Manual » Features » Tool Bar » File Menu » Import and Export VOSWMM Models
INP files can be Imported into VO-SWMM and can also be Exported. Import INP Format Select File from main menu window -> Import -> Import SWMM Input File: File path of INP file to be imported into VO-SWMM Generate Layout for Schematic: Checking this will generate…
SWMM5 Data
User’s Manual » Features » Tool Bar » Simulation » Simulation – Data » SWMM5 Data
In the Data section of the Simulation tab, all data types like transect, curves and climatology etc are defined in the same way as SWMM5. Icon Function Icon Function Transects Curves Climatology …
Tool Bar
User’s Manual » Features » Tool Bar
Following lists are present at the top of the VOSWMM main interface. For a more detailed description of each Toolbar item, please click on each topic to navigate. File Home Simulation GIS Tools Micro-Drainage
Features
User’s Manual » Features
VO-SWMM not only utilizes Microsoft’s latest .Net Framework, 4.0 but also uses WPF (Windows Presentation Foundation) to enhance user experience through the graphical user interface. VH SWMM has new features that improve the efficiency of creating and simulating…
New Design Storm
User’s Manual » Features » Tool Bar » Simulation » Simulation – Data » Resource Library » New Design Storm
There are several ways to create a design storm in Resource Library which are corresponding to different scenarios. Manual Input is used for the case where the design storm will be created from scratch. It gives the flexibility to add, insert, modify, and delete the…
File Menu
User’s Manual » Features » Tool Bar » File Menu
Icon Command Description New Project Create a new project Open Project Opens an existing project. VO-SWMM allows to open a VO-SWMM project (.voprj) or a INP file (.inp) Save Project …
Conversion of Modeling Objects
User’s Manual » Features » Tool Bar » File Menu » Import OTTHYMO to VOSWMM » Conversion of Modeling Objects
The modeling objects in OTTHYMO and VO-SWMM projects are different, although they share some similarities. The conversion of all the OTTHYMO objects is described for each of them. *Some assumptions are made to set parameters during the conversion. Users should check…
Dual-Drainage Modeling Procedure
User’s Manual » Features » Tool Bar » Micro-Drainage Tools » Dual-Drainage Modeling Procedure
In the stormwater management system, on the one hand, the stormwater collection is often done via catch basin. Catch basins are used to catch overland flow and transport the water to underground sewer system. On the other hand, the overland inflow can also entre…
Step 1: Undeveloped Site – Model Setup
Post-Development Runoff (backup) » Step 1: Undeveloped Site – Model Setup
The SWMM model for the undeveloped site is depicted below. It consists of a single Subcatchment S1 whose runoff drains to Outfall node O2. Note that the undeveloped site contour map has been used as a backdrop image. The scenario name is undeveloped. Utilizing a…
10.3 Calibration Files
VO-SWMM » 10 Visual OTTHYMO Files » 10.3 Calibration Files
The calibration files are used to import the observed time series data and compare to the simulation outputs. Two file formats are supported: 1) SWMM format and 2) simple CSV format. SWMM Format The SWMM calibration file format is supported. From SWMM user’s…
Transect Feature Tutorial
Tutorials » GIS Tools » Transect Feature Tutorial
In this tutorial, you will learn how to use the Automate Transect feature in VO SWMM to assign cross-sections to conduits using a DEM file and a cross-section layer. Follow these steps to successfully utilize this powerful tool: Prerequisites Before you begin, ensure…
Import OTTHYMO to VOSWMM
User’s Manual » Features » Tool Bar » File Menu » Import OTTHYMO to VOSWMM
Users can import a VO-OTTHYMO project into VOSWMM. If the OTTHYMO model is created on Schematic View, before importing to VOSWMM, please make sure the Schematic View is turned on for VOSWMM project in the Home ribbon Options, so the importing can add models to the…
Model Setup
Practical Example of VOSWMM for Students » 5. Runoff Water Quality » Model Setup
In this example, we’ll focus solely on Total Suspended Solids (TSS) as a key water quality parameter. TSS is a common pollutant in urban stormwater, often found at high concentrations. Reported TSS EMCs range from 180 to 548 mg/L (U.S. EPA, 1983) and 225 to 400…
Automate Transect
User’s Manual » Features » Tool Bar » Micro-Drainage Tools » Automate Transect
The Automate Transect feature in VO SWMM is a tool designed to streamline the process of assigning cross-sections to conduits in your stormwater modeling projects. This manual will provide you with a clear understanding of what this feature is and how to use it…
What’s VO Suite
User’s Manual » What’s VO Suite
VO Suite is one installer and platform that hosts two products: VO-OTTHYMO and VO-SWMM. Users can have access to one or both of them based on their choices of license. This manual will introduce VO-SWMM. For VO-OTTHYMO, please refer to the VO-OTTHYMO Manual and…
Model Setup
Practical Example of VOSWMM for Students » 2. Surface Drainage Hydraulics » Model Setup
Figure 2-4 illustrates the layout of the runoff conveyance system intended for incorporation into the developed site. This system encompasses 7 grass swales, 3 culverts, and a single street gutter. The primary aim here is to assess discharges at the site’s…
2.2 Loss Routine
Reference Guide » 2 Tips for Modeling Ungauged Urban Catchments » 2.2 Loss Routine
In both the United States and Canada, either the Horton’s Method (LOSS = 1) or the CN Method (LOSS = 2) are commonly used for urban catchments. The Proportional Loss Method (LOSS = 3) has been successfully used in France for urban catchments. While the selection of…
Properties Tab
User’s Manual » Features » Object Parameters and Results » Properties Tab
Properties window shows all properties of selected hydrologic object(s) or current scenario. To use Properties window: Select single hydrologic object in Map View or Schematic View to view and edit all properties of the object Select multiple hydrologic objects in…
Schematic and Map View
User’s Manual » Features » Schematic and Map View
Turn on/off Schematic VIew: The Schematic View in VO-SWMM project can be turned on/off in the Options of Home. Please follow the descriptions of Home for more details. To see the effect of Schematic View on/off selection, create a new or open a saved project, and the…
Micro-Drainage Tools
User’s Manual » Features » Tool Bar » Micro-Drainage Tools
Micro Drainage is a modeling methodology for analyzing surface and sewer drainage system performance using the best-available information. Micro Drainage analysis models the precipitation flowing from overland system into the minor system through catch basins acting…
Result Summary Tables
User’s Manual » Features » Result Summary Tables
Result Summary Tables window provides a spreadsheet environment for showing/editing SWMM simulation result. By default, it’s located at the bottom of the main interface. It can be toggled on/off via Tool Bar > Home > Windows. Result Summary Tables will be reset…
Problem Statement
Practical Example of VOSWMM for Students » 3. Detention Pond Design » Problem Statement
Example 1 developed a model for initial runoff on a 29-acre site. Additional models simulated post-development runoff, both with and without surface collection routing (Example 2), for 2-, 10-, and 100-year storms. Example 3 prompts designing a detention pond…
Problem Statement
Practical Example of VOSWMM for Students » 2. Surface Drainage Hydraulics » Problem Statement
Figures 2-1 and 2-2 display the pre- and post-development SWMM model layouts from Example 1. In Figure 2-1, the pre-development region was depicted by a single subcatchment, sized according to a 500 ft overland flow limit. The post-development scenario (Figure 2-2)…
6.4.4 Simulation Results
Reference Guide » 6 Routing Options in Visual OTTHYMO » 6.4 Muskingum – Cunge Channel Routing » 6.4.4 Simulation Results
The channel routing in Visual OTTHYMO was tested using a natural channel, 5200 m long, main channel bed slope is 0.001, Manning’s n is 0.03, floodplain bed slope is 0.001, Manning’s n is 0.05, no lateral flow, the cross-section parameters are shown in the…
User’s Manual
User’s Manual
This manual provides introductions on VO-SWMM and the use of its basic functions and advanced tools.
Manhole Inflow and Infiltration Modeling
User’s Manual » Features » Tool Bar » Micro-Drainage Tools » Dual-Drainage Modeling Procedure » Manhole Inflow and Infiltration Modeling
As described in the Dual-Drainage Modeling Procedure, the inflow and infiltration entering the sewer via manhole can be modelled by outlet links’ rating curves. The first step of manhole inflow and infiltration (I&I) modeling to know which type of manholes are…
D. Radar
VO-SWMM » D. Radar
This unique VO-SWMM feature is an improved way to generate the watershed surface. Ground corrected radar leverages the computational power. Rainfall radar and other distributed rainfall techniques are used for pre- and post-storm event forensic analysis and system…
4.3 Importing Scenarios from Model Data Files
VO-SWMM » 4 Working Projects and Scenarios » 4.3 Importing Scenarios from Model Data Files
A scenario can be created by importing from model data files. This is useful when 1) the model is in another model platform (e.g. SWMM) or in older VO data files and 2) there is need to integrate a scenario to current project.
Welcome
User’s Manual » Welcome
Welcome to VO Storm Water Management Model (VO-SWMM), the hydrologic & hydraulic model simulation software package. It is an effective hydrologic management software that has been developed for various analyses including Watershed Studies, Sub-watershed Studies, Master…
A. Seminars and Workshops
User’s Manual » VO-SWMM Support » A. Seminars and Workshops
Smart Water City Inc. hosts seminars and workshops that allow users the opportunity to learn the basics of VO-SWMM and use all its features to their full potential. Seminars and workshops are organized by need. You can find more information from our…
Practical Example of VOSWMM for Students
Practical Example of VOSWMM for Students
This tutorial revolves around using EPA SWMM resources to practically implement projects with VOSWMM. We’ll follow step-by-step guides based on the “Storm Water Management Model Applications Manual” by Jorge Gironás, Larry A. Roesner, and Jennifer…
Step 17: Export INP File
Tutorials » Quick Start Tutorial » Step 17: Export INP File
Click the File button on the left upper corner. Navigate to the Export and choose Export to SWMM INP File. In the pop-up window, choose the location where to put the INP file.
RouteReservoir
User’s Manual » Features » Tool Bar » File Menu » Import OTTHYMO to VOSWMM » Conversion of Modeling Objects » RouteReservoir
OTTHYMO object VOSWMM object RouteReservoir Storage Unit with a Pump and if applicable a Weir. The Storage Unit is used to model the main structure of reservoir. The Pump is used to model the outflow from the reservoir. If the reservoir has…
9.4.4 Groundwater Infiltration
Reference Guide » 9 Water Balance Processes in Continuous Simulation » 9.4 Active Soil Zone Water Balance » 9.4.4 Groundwater Infiltration
The percolation equation used in SWMM (Rossman & Huber, 2016) is used to calculate the groundwater infiltration. where: K = the saturated hydraulic conductivity, ∅ = the soil total porosity, θ = the soil moisture HCO = the percolation coefficient depending on…
3. Detention Pond Design
Practical Example of VOSWMM for Students » 3. Detention Pond Design
Example 3 explains the process of creating, designing, and assessing a detention pond using SWMM. The detention pond, designed for water quality capture and peak flow control, employs storage components, orifices, and weirs. It models an urban catchment akin to…
GIS Tools
User’s Manual » Features » Tool Bar » GIS Tools
With VOSWMM, we are introducing TatukGIS that will be built into the program. No additional GIS license is required to use Tatuk Map. Users can now choose an ArcGIS or TatukGIS map from Home Tab Options. Note that an ArcGIS license is required to use the ArcGIS map. …
VOSWMM Main Interface
User’s Manual » Features » VOSWMM Main Interface
After installation, the initial interface is in VO. To switch to VOSWMM, click File drop-down list. In the New Project, select New SWMM Project. The VOSWMM main interface will show.
4. Low Impact Development
Practical Example of VOSWMM for Students » 4. Low Impact Development
This example shows how to model two Low Impact Development (LID), filter strips and infiltration trenches, within SWMM. Unlike the previous Example 3, which focused on large-scale detention ponds, these LIDs work on a smaller scale and rely on infiltration and…
5. Runoff Water Quality
Practical Example of VOSWMM for Students » 5. Runoff Water Quality
This example demonstrates simulating pollutant accumulation and washoff in an urban area, considering different land uses and using Event Mean Concentrations (EMCs) and exponential functions for washoff. Surface runoff quality is crucial yet complex in wet-weather flow…
Step 26: Save Project and Export INP File
Tutorials » Dual-Drainage Model » Step 26: Save Project and Export INP File
Click the Save Project button in the Home tab. Click the File button on the left upper corner. Navigate to the Export and choose Export to SWMM INP File. In the pop-up window, choose the location where to put the INP file.
2. Surface Drainage Hydraulics
Practical Example of VOSWMM for Students » 2. Surface Drainage Hydraulics
While Example 1 demonstrated a hydrologic model for urban runoff, it didn’t include hydraulic routing. In Example 2, we’ll use SWMM’s hydraulic features to model a surface drainage system. We’ll add a conveyance network to the post-development…
Step 2: Create a New VOSWMM Project
Tutorials » Quick Start Tutorial » Step 2: Create a New VOSWMM Project
Navigate to Home tab. Select New SWMM Project from the drop-down list of New Project button Turn off BaseMap by unchecking the box in the map layer table. *In this tutorial, we will create a virtual model, so we do not need to show the map. Click the…
Time Patterns
User’s Manual » Features » Tool Bar » Simulation » Simulation – Data » SWMM5 Data » Time Patterns
Time Patterns are used to introduce periodic variations in external dry weather flow (DWF) and involve adjustment factors as multipliers for a baseline DWF flow rate or pollutant concentration. These patterns come in different types: Monthly, Daily, Hourly, and…
References
Reference Guide » References
1. Arnell Viktor, “Rainfall Data for the design of Sewer Pipe Systems” Report Series A:8, Department of Hydraulics, Chalmers University of Technology, 1982. 2. Arnell Viktor, “Analysis of Rainfall Data for use in Design of Storm Sewer Systems”…
Schematic View
User’s Manual » Features » Schematic and Map View » Schematic View
Schematic View is a model focused on the logic relationship of hydraulic objects, not their physical locations or appearance. It will demonstrate in a straightforward way about how those objects are connected with each other. Because of this unique characteristic, it…
Tool Box
User’s Manual » Features » Tool Box
By default, all available hydrologic objects are list in Tool Box on the left of VO-SWMM main interface. Adding objects on to Schematic View To add one hydrologic object on canvas in Schematic View, drag and drop it on canvas. Then it can be moved to any location. …
Step 2: Create a New VOSWMM Project and Change the Scenario Settings
Tutorials » Dual-Drainage Model » Step 2: Create a New VOSWMM Project and Change the Scenario Settings
Navigate to Home tab. Select New SWMM Project from the drop-down list of New Project button Click the Properties tab in Project Manager which by default is on the right side of the VOSWMM main interface. Change the Unit to CMS and the LinkOffset to Elevation. …
E. Capture Curves
VO-SWMM » E. Capture Curves
Emphasis is not only on peak flow reduction but also storm Water Quality Control (WQC). Urban stormwater management practices, therefore, include the designing of retention ponds, infiltration systems, wetlands, etc. Sizing these WQC basins are very important. Contrary…
Step 2: Create a New VOSWMM Project
Tutorials » Post-Development Runoff » Step 2: Create a New VOSWMM Project
Navigate to Home tab. Select New SWMM Project from the drop-down list of New Project button Right-click on the “Scenario1” under Drainage Network Scenarios in the Project Manager tab. In the context menu, choose Rename. The name of…
Model Results
Practical Example of VOSWMM for Students » 2. Surface Drainage Hydraulics » Model Results
Culvert Sizing Before comparing alternative routing methods in SWMM, it’s essential to determine culvert diameters in the conveyance system. This involves finding the smallest size from Table 2-5 for each culvert, ensuring it handles 100-year, 2-hour storm…
Time Series
User’s Manual » Features » Tool Bar » Simulation » Simulation – Data » SWMM5 Data » Time Series
The Time Series Editor is used when creating or editing Time Series objects. Click the Time Series button to open the Time Series Editor window. Button Description Add one time-series dataset Delete selected time-series…
GIS – Snapping
User’s Manual » Features » Tool Bar » GIS Tools » GIS – Snapping
VO-SWMM provides following snapping tools. Icon Command Icon Command Icon Command Icon Command Point Allows to snap to a point. EndPoint Allows to snap to the end point of polyline or polygon. (Available only in ArcGIS)…
Import/Export GIS
User’s Manual » Features » Tool Bar » Micro-Drainage Tools » Import/Export GIS
This section includes the following tools. Import Layer This tool will import GIS shape files and match the attributes of the GIS shape files to the properties used in the VOSWMM model. Click the Import Layer button. In the pop-up window, the Layer field from the…
Step 3: Undeveloped Site – Add Background Image
Tutorials » Post-Development Runoff » Step 3: Undeveloped Site – Add Background Image
To help facilitate the placement of drainage-system objects, SWMM can utilize an image as a backdrop behind a project’s study area map. This image is typically a site map of some kind with known dimensions. Any bitmap image file (BMP extension), JPEG image file (JPG…
C. Distributed Rainfall Modelling Technique
VO-SWMM » C. Distributed Rainfall Modelling Technique
Rainfall data, an essential element of stormwater management analyses, is recorded at and collected from rain gauges. The location of the rain gauge is therefore important. The closer the rain gauge is to the flow meter the better. However, this may not always be…
Model Setup
Practical Example of VOSWMM for Students » 6. Runoff Treatment » Model Setup
We enhance runoff controls on the study site starting from the Example6-Initial.inp file. This file already includes the local LIDs from Example 4 and the modified storage unit and outlet structures from problem statement. Land uses in this file were adjusted based on…
11.2 Program Quits During Run Simulation
VO-SWMM » 11 Troubleshooting » 11.2 Program Quits During Run Simulation
The most common cause of the program quitting during a run simulation is due to incorrect input. To isolate the suspect input, try the following: After the program quits, open the Detailed Output file using a text editor. Make note of the command (by NHYD) where the…
Step 9: Run Simulation
Tutorials » Dual-Drainage Model » Step 9: Run Simulation
In Simulation toolbar, click the Engine Options button. In the pop-up SWMM Engine window, click the Time Step tab. Set Reporting time step as 5 min. Click the Run button in the Simulation toolbar. In the pop-up Batch Run window, click the button to add a…
7.2.2 Watersheds Studies
Reference Guide » 7 Design Storms for Stormwater Management Studies » 7.2 Methodology for Comparing Design Storms and a Historical Storm Series » 7.2.2 Watersheds Studies
Three different types of watersheds were examined in this study; a rural watershed, an urban watershed and a mixed land use watershed. Two rural watersheds in southern Ontario were tested, one was large and had an area of 6540 ha. the other was small having an area of…
3.9.3 UNDERGROUND STORAGE CHAMBERS
VO-SWMM » 3 Conceptual Model » 3.9 Low Impact Development (LID) » 3.9.3 UNDERGROUND STORAGE CHAMBERS
Underground storage chambers are typically designed to store larger volumes of water and are often used for quantity control. Underground storage chambers have large void spaces and typically have open bottoms allowing the system to infiltrate into the surrounding…
Transects
User’s Manual » Features » Tool Bar » Simulation » Simulation – Data » SWMM5 Data » Transects
Click the Transects button to open the Transects window. Button Description Add one transect Delete selected transects. Please note to use Ctrl and Shift keys for multiple selection. Import a group of…
Post-Development Runoff
Tutorials » Post-Development Runoff
This tutorial demonstrates how to construct a hydrologic model of an urban catchment and use it to compare stormwater runoff under both pre- and post-development conditions. Only catchment runoff will be considered. Models of this type are very common in practice. Many…
Error List
User’s Manual » Features » Error List
The Error List window shows the errors and warnings in the model. By default, it’s located at the bottom of the main interface. Certain rules apply to an VO-SWMM model. If these rules are not met, a warning or an error will show in the Error List window. The…
Step 11: Process DEM
Tutorials » Dual-Drainage Model » Step 11: Process DEM
The DEM processing will use the tools in the DEM Processing section in the Micro-Drainage tab. There are six tools in the DEM Processing section in Micro-Drainage toolbar. The first one Run DEM is a tool to run all the other five tools in a click. Users can also user…
Subcatchment
User’s Manual » Features » Tool Box » Hydrology » Subcatchment
A subcatchment is a hydrologic unit that generates runoff and produces a hydrograph that can be routed downstream. It can have two parts, pervious and impervious areas. A pervious area is a surface where water infiltrates into the upper soil zone, but in an…
Outfall
User’s Manual » Features » Tool Box » Nodes » Outfall
An outfall is a component that can be the last node of the drainage system of a subcatchment. Parameter Name Description Default Value NHYD Hydrograph number. — NAME Name of the component. —…
Step 1: Open a Saved Project and Set Up Project
Tutorials » Modeling and Analysis of Manhole Inflow & Infiltration Using Dual-Drainage Method » Step 1: Open a Saved Project and Set Up Project
Open the project saved from the tutorial Dual-Drainage Model We will use the model of the tutorial Dual-Drainage Model. Click this link to download the model of the tutorial Dual-Drainage Model.. Open the downloaded project of by navigating to File -> Open Project. …
Model Setup
Practical Example of VOSWMM for Students » 3. Detention Pond Design » Model Setup
SWMM can simulate storage units capturing runoff from various design storms and releasing it systematically to a receiving channel. This example illustrates the iterative process of designing a storage pond, altering its dimensions and outlets to meet criteria for…
Inflow
User’s Manual » Features » Tool Box » Nodes » Junction for VOSWMM » Inflow
Direct Inflow The “Direct” page in the Inflows Editor dialog is a tool used to define how external flow and water quality enter a node in a drainage system over a specific period. It involves two main components: Baseline Component: This represents a…
7.4 Conclusions
Reference Guide » 7 Design Storms for Stormwater Management Studies » 7.4 Conclusions
Simulations with the Chicago and SCS 24-hr design storms were compared with a series of real storms to determine if the flow frequency results they produce are reliable. The design storms and a historical storm series were tested on rural, urban and mixed land use…
Engine Options
User’s Manual » Features » Tool Bar » Simulation » Simulation – Run and Options » Engine Options
Engine Options Click the Engine Options button. In the pop-up window, set parameters used by the SWMM5 engine. *Please note that the settings will be used in the same way as in EPA SWMM5. The EPA SWMM User’s Manual is the reference for this part. The…
New Measured
User’s Manual » Features » Tool Bar » Simulation » Simulation – Data » Resource Library » New Measured
For continuous simulation, the time series data usually comes from monitoring gauges. It is necessary to have the gauge information (e.g. ID and location) included in the Resource Library to enable connect to monitoring database and apply distributed rainfall models.…
Model Setup
Practical Example of VOSWMM for Students » 4. Low Impact Development » Model Setup
Filter Strips Figure 4-1 presentes the locations of the filter strips (FS) for this example. We’ll add these Low Impact Developments (LIDs) to the initial VOSWMM model, Example2-Post.inp, which already contains subcatchments and a runoff system. To assist in…
6.6.4.2 Using DRMT Tool
VO-SWMM » 6 Working with the Map » 6.6 Using GIS Tools » 6.6.4 Distributed Rainfall Modeling Technique (DRMT) » 6.6.4.2 Using DRMT Tool
To use the DRMT tool, interpolate the rainfall for each catchment: Click the DRMT tool in GIS tab. The Generate DRMT window will appear. The number of selected catchments is given at top of the window. If no catchment is selected, it will apply to all catchments.…
Model Results
Practical Example of VOSWMM for Students » 5. Runoff Water Quality » Model Results
We ran both the EMC washoff model (Example5-EMC.inp) and the exponential washoff model (Example5-EXP.inp) for 0.1 in., 0.23 in., and 2-year rainfall events, with the following analysis options: Simulation Period: 12 hours Antecedent Dry Days: …