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Unit Hydrographs
User’s Manual » Features » Tool Bar » Simulation » Simulation – Data » SWMM5 Data » Unit Hydrographs
The Unit Hydrograph Editor is used to create and edit Unit Hydrograph objects, which define the shape parameters and rain gauge information for a group of triangular unit hydrographs. These unit hydrographs are crucial for calculating rainfall-derived…
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…
Storage Unit
User’s Manual » Features » Tool Box » Nodes » Storage Unit
Storage Unit is an element that provides storage for a basin (e.g. pond). Parameter Name Description Default Value NHYD Hydrograph number. — NAME Name of the component. — COMMENT 1, 2,…
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…
5.7.1 Instantaneous Unit Hydrograph
Reference Guide » 5 Unit Hydrograph Options in Visual OTTHYMO » 5.7 Unit Hydrograph Options for Rural Areas » 5.7.1 Instantaneous Unit Hydrograph
Many ways of deriving synthetic unit hydrographs or IUH have been proposed since the early studies of Snyder in 1938. One frequently used way is by means of a conceptual model made up of a cascade of equal, linear reservoirs, first proposed by Nash in 1957. The IUH for…
5.7.3 William’s Unit Hydrograph
Reference Guide » 5 Unit Hydrograph Options in Visual OTTHYMO » 5.7 Unit Hydrograph Options for Rural Areas » 5.7.3 William’s Unit Hydrograph
WILHYD is the subroutine that uses the unit hydrograph proposed by Williams and Hann (1973). The unit hydrograph is divided into three parts for computation. The first part, from the beginning of rise to the inflection point, , is computed by the 2-parameter gamma…
5 Unit Hydrograph Options in Visual OTTHYMO
Reference Guide » 5 Unit Hydrograph Options in Visual OTTHYMO
In Visual OTTHYMO, the response of a watershed to the effective rainfall is obtained by convolution of a short duration unit hydrograph (UH) derived from the theory of conceptual “instantaneous unit hydrographs” or IUH. The characteristics of these unit…
5.7 Unit Hydrograph Options for Rural Areas
Reference Guide » 5 Unit Hydrograph Options in Visual OTTHYMO » 5.7 Unit Hydrograph Options for Rural Areas
For computation of flows from rural watersheds, the subroutines NASHYD, WILHYD or SCSHYD (NASHYD with N=5) can be used. The rainfall excess distribution is obtained by means of a modified CN procedure, which is then convoluted with the unit hydrograph obtained by means…
Step 14: Add and Connect Storage Unit at Sag Area
Tutorials » Dual-Drainage Model » Step 14: Add and Connect Storage Unit at Sag Area
Sag area can be modelled as a Storage Unit. VOSWMM can measure the Storage Curve from the DEM. A. Add storage unit Zoom into the sag area at the downstream of the overland conduits, which is the location where all the three branches merge. Click the button Create…
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 …
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…
3.4.3 WILHYD
VO-SWMM » 3 Conceptual Model » 3.4 Flow Generation Hydrologic Objects » 3.4.3 WILHYD
WilHyd is used to simulate hydrographs from rural watersheds with long recession periods. The program uses the Williams and Hann’s unit hydrographs developed in the original HYMO program and the Modified SCS Curve Number Procedure to calculate the rainfall…
1.3 Time to Peak Parameter, TP
Reference Guide » 1 Tips for Modeling Ungauged Rural Catchments » 1.3 Time to Peak Parameter, TP
Unlike the urban catchment hydrographs, rural catchment unit hydrographs do not calculate the time to peak TP as a function of the other variables. The TP parameter must therefore be deter-mined by the modeller. It should be noted that most methods of estimate TP,…
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…
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…
5.6 Use of IUH’s for I/I Simulation and Baseflow (DWF
Reference Guide » 5 Unit Hydrograph Options in Visual OTTHYMO » 5.6 Use of IUH’s for I/I Simulation and Baseflow (DWF
Visual OTTHYMO can be used to simulate the Infiltration/Inflow into sanitary sewers or combined sewers. The four types or rainfall-induced infiltration/inflow are: Fast responses from directly connected impervious areas. Rapid responses from grassed areas in…
9.2.3 Hydrograph Plot
VO-SWMM » 9 Working with Output » 9.2 Single-Event Simulation Outputs » 9.2.3 Hydrograph Plot
The Hydrograph Plot feature can be used to view hydrographs graphically without the need for a third-party application. This feature allows users to quickly view their hydrographs, compare them, and make qualitative assessments about their model. VO provides three…
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”…
9.2.3.2 Cross Scenario Plot
VO-SWMM » 9 Working with Output » 9.2 Single-Event Simulation Outputs » 9.2.3 Hydrograph Plot » 9.2.3.2 Cross Scenario Plot
The Cross Scenario Plot feature can be used to compare hydrographs from two different scenarios (existing and proposed) on the same graph. This is a good tool for quickly comparing hydro-graphs at known locations, based on proposed modifications within the upstream…
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…
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 4: Developed Site – Model Results
Post-Development Runoff (backup) » Step 4: Developed Site – Model Results
Hydrographs We can view the summary results in the Result Summary Tables in the same fashion as for the pre-development condition. Click the header of NHYD to sort the table by subcatchment NHYD. Pre- and Post-Development Comparison To compare hydrographs of pre-…
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…
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. …
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…
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 …
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…
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…
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…
3.6.4 DIVERTHYD
VO-SWMM » 3 Conceptual Model » 3.6 Flow Separation Hydrologic Objects » 3.6.4 DIVERTHYD
DiverHyd can be used to simulate diversion channels and multi-outlet structures. By entering a table of inflow-outflow relationships the hydrologic object can split a hydrograph into a maximum number of five hydrographs. The five hydrographs must add up to the original…
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…
5.4 SCS IUH (SCSHYD)
Reference Guide » 5 Unit Hydrograph Options in Visual OTTHYMO » 5.4 SCS IUH (SCSHYD)
The shape of the SCS UH is obtained from the NASH relation, with N=5. This value is greater than the one determined from studies in Ontario, Switzerland, and the United Kingdom. It is, however, conservative if the time to peak is correct. The SCS non-dimensional unit…
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…
Model Results
Practical Example of VOSWMM for Students » 3. Detention Pond Design » Model Results
The final VOSWMM model, including the detention pond, is presented in Figure 3-9 with the input file named Example3.inp. Table 3-4 summarizes discharge elements in the pond’s outlet, detailed in Figure 3-10. Figure 3-9 Figure 3-10 To evaluate the…
3.7 Flow Merging Hydrologic Objects
VO-SWMM » 3 Conceptual Model » 3.7 Flow Merging Hydrologic Objects
AddHyd is used to add any number of hydrographs. There is no parameter associated with AddHyd.
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…
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…
2.7 Viewing Single-Event Simulation Outputs
VO-SWMM » 2 Quick Start Tutorial » 2.7 Viewing Single-Event Simulation Outputs
The main output from a single-event simulation is hydrograph. The hydrographs can be displayed in graph, table and summary. Graph To plot hydrographs with rainfall, select the hydrologic objects and then click the Hydrograph button in Simulation tab. The Hydrograph…
Importing of Data
User’s Manual » Features » Tool Bar » File Menu » Import OTTHYMO to VOSWMM » Importing of Data
Rain Data The rain groups and rain data are imported from OTTHYMO projects to VOSWMM. Rain group names and rain data names in VOSWMM are the same in OTTHYMO. For each imported rain data: If the imported OTTHYMO project is a single-event OTTHYMO project: Rain Format…
Step 11: Developed Site – Model Results
Tutorials » Post-Development Runoff » Step 11: Developed Site – Model Results
Hydrographs We can view the summary results in the Result Summary Tables in the same fashion as for the pre-development condition. Select the run to view results in the Run dropdown list and click the header of NHYD to sort the table by subcatchment NHYD. Pre- and…
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…
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…
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…
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…
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…
User’s Manual
User’s Manual
This manual provides introductions on VO-SWMM and the use of its basic functions and advanced tools.
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…
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…
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.…
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.
9.2.3.1 Hydrograph
VO-SWMM » 9 Working with Output » 9.2 Single-Event Simulation Outputs » 9.2.3 Hydrograph Plot » 9.2.3.1 Hydrograph
To view the hydrograph, first select the objects in Map View or Schematic View, then click the Hydrograph button in Simulation tab. The Hydrograph window will appear. The hydrographs of selected objects are plotted at the bottom of the plotting area. The figure…
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.
9.2.3.3 Plot Calibration
VO-SWMM » 9 Working with Output » 9.2 Single-Event Simulation Outputs » 9.2.3 Hydrograph Plot » 9.2.3.3 Plot Calibration
It is necessary to compare the observed and simulated hydrograph in model calibration. Plotting the two hydrographs and the corresponding rainfall in the same plot is very helpful to guide the calibration. Identifying the Gauge Objects’ To compare to an…
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…
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…
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…
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…
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…
3.5.2 MUSKINGUMCUNGE
VO-SWMM » 3 Conceptual Model » 3.5 Flow Routing Hydrologic Objects » 3.5.2 MUSKINGUMCUNGE
MuskingumCunge is used to route hydrographs through typical channel cross-sections using the Muskingum-Cunge routing method. This method is based on the continuity equation and the storage-discharge relation. The open channel cross-section is described with X and Y…
9.2.2 Hydrograph Data
VO-SWMM » 9 Working with Output » 9.2 Single-Event Simulation Outputs » 9.2.2 Hydrograph Data
This output feature allows the user to view the actual hydrograph numerical data, in terms of time step and flow. Users can view an individual hydrograph, at a selected location within the model, or multiple hydrographs. Users can also copy the desired values and paste…
3.6.2 DUHYD
VO-SWMM » 3 Conceptual Model » 3.6 Flow Separation Hydrologic Objects » 3.6.2 DUHYD
DuHyd is used to separate the major (street flow) and the minor (pipe flow) hydrographs from a total hydrograph. TABLE 3-8 DUHYD PARAMETERS Parameter Name Description Default Value Major NHYD of major system connection Empty…
3.5.4 ROUTERESERVOIR
VO-SWMM » 3 Conceptual Model » 3.5 Flow Routing Hydrologic Objects » 3.5.4 ROUTERESERVOIR
RouteReservoir is used to route hydrographs through reservoirs using the Storage-Indication method. RouteReservoir has only one parameter, the Discharge-Storage Curve (Rating Curve). It has pairs of discharge-storage values to describe the Discharge-Storage…
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…
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. …
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…
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…
Home
User’s Manual » Features » Tool Bar » Home
The Home tab includes the basic functions to create new project, open existing projects, set default project options, and perform basic editing and searching to the project. Home Tab Icon Command Description Icon Command Description…
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…
6.3 Variable Storage Coefficient Routing in Visual OTTHYMO
Reference Guide » 6 Routing Options in Visual OTTHYMO » 6.3 Variable Storage Coefficient Routing in Visual OTTHYMO
Like other hydrologic routing methods, the variable storage coefficient (VSC) is based on the continuity relation. It does not apply empirical or calibrated parameters. It calculates channel storage based on average channel characteristics, and travel time based on…
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)…
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…
3.5.3 ROUTEPIPE
VO-SWMM » 3 Conceptual Model » 3.5 Flow Routing Hydrologic Objects » 3.5.3 ROUTEPIPE
RoutePipe is used to route hydrographs in circular or rectangular pipes. It uses a simplified form of the RouteChannel input. Only the pipe diameter or width and heights are required and only one Manning’s roughness coefficient is allowed. The hydrologic object…
6.6.4 Distributed Rainfall Modeling Technique (DRMT)
VO-SWMM » 6 Working with the Map » 6.6 Using GIS Tools » 6.6.4 Distributed Rainfall Modeling Technique (DRMT)
Rainfall data, an essential element of storm water management analyses, is recorded at and collected from rain gauges. Therefore, the location of the rain gauge is important. The closer the rain gauge is to the flow meter the better. However, this may not always be…
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…