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A.5.2 RouteChannel in Continuous Project – Erosion Analysis for
User’s Manual » 12 Appendix A – Tools » A.5 Scenario Comparison » A.5.2 RouteChannel in Continuous Project – Erosion Analysis for
For RouteChannel command, there is an extra tabs called Erosion Indices for Continuous project. The Erosion Indices compares RouteChannel results in three erosion indices: Time of Exceedance, Cumulative Erosion Index and Cumulative Effective Work Index. Before doing…
Step 4: Create RouteChannel with Stream Layer
Tutorials » Creating a VO model with Existing GIS Data » Step 4: Create RouteChannel with Stream Layer
Turn on the stream layer and turn off other layers on top of the stream layer. Use ctrl + mouse left key to select all the three streams. The selected streams will be highlighted in red. Right click the mouse to open the context menu and select RouteChannel in…
Step 6: Create RouteChannel
Tutorials » Creating a VO Model in Schematic View » Step 6: Create RouteChannel
StandHyd and NasHyd generate hydrographs. These hydrographs are then passed through channels by RouteChannel to the downstream. To create a RouteChannel, select RouteChannel in the Tool Box and drag-and-drop it to the Canvas. Put it on the channels it will simulate.…
3.5.1 ROUTECHANNEL and COMPOUNDCHANNEL
User’s Manual » 3 Conceptual Model » 3.5 Flow Routing Hydrologic Objects » 3.5.1 ROUTECHANNEL and COMPOUNDCHANNEL
RouteChannel is used to route hydrographs through typical channel cross-sections using the Variable Storage Coefficient (VSC) Method. The open channel cross-sections are described with X and Y co-ordinates. The COMPOUNDCHANNEL command in VO6 has been split to calculate…
Modeling a Wetland: Continuous Simulation, Calibration and Hydroperiod Analysis
Tutorials » Modeling a Wetland: Continuous Simulation, Calibration and Hydroperiod Analysis
In this exercise, we will create a VO model for the wetland shown below. It has one (1) contributing rural catchment. This exercise will mainly focus on building a continuous VO model, running the simulation, calibrating the model and analyzing the results. You…
A.5.1 Wetland in Continuous Project – Hydroperiod and Inflow Mass Curve
User’s Manual » 12 Appendix A – Tools » A.5 Scenario Comparison » A.5.1 Wetland in Continuous Project – Hydroperiod and Inflow Mass Curve
For RouteWetland command, there are two extra tabs called Hydroperiod and Inflow Mass Curve for Continuous project. In those two tabs, VO uses the results of one pre-development scenario to calculate difference from the other scenarios to the pre-development scenario.…
Working with a Continuous Model
Tutorials » Working with a Continuous Model
In this exercise, we will create a continuous VO model using a single-event model and then run the simulation with 10 years of climate data from Toronto Pearson Airport. This exercise covers the basic work flow in a continuous simulation. You will find that the…
Step 1: Open VO and create a Continuous Otthymo project
Tutorials » Working with a Continuous Model » Step 1: Open VO and create a Continuous Otthymo project
1. Navigate to File -> New Project and select New Continuous Otthymo Project 2. To import Single-event VO Model, use menu File -> Import -> Import VH Scenario (Current project) and browse to the training package. Open…
8.3 Continuous Simulation
User’s Manual » 8 Running a Simulation » 8.3 Continuous Simulation
This chapter introduces how to set and run a continuous model.
Step 1: Open VO and create a new Continuous Otthymo project
Tutorials » Modeling a Wetland: Continuous Simulation, Calibration and Hydroperiod Analysis » Step 1: Open VO and create a new Continuous Otthymo project
Open VO. Click the Options button in the Home tab and set the options as below. Click OK to save and close Options window. Close and restart VO. Navigate to File -> New Project. Select New Continuous Otthymo Project This will create a new project with a default…
9 Water Balance Processes in Continuous Simulation
Reference Guide » 9 Water Balance Processes in Continuous Simulation
The water balance in snow pack, depression storage and active soil zone is simulated to extend the single-event simulation to continuous. This chapter describes the equations used in these processes.
Step 4: Create a New Continuous Model from the Single-Event Model
Tutorials » Analyzing Erosion for New Development » Step 4: Create a New Continuous Model from the Single-Event Model
The continuous project will be used for model calibration and long-term simulation. Save the Single-Event Project Before working on a continuous project, save the single-event project. Click Save Project button in the Home toolbar to save all information (including…
2.10 Running Continuous Simulations
User’s Manual » 2 Quick Start Tutorial » 2.10 Running Continuous Simulations
Besides rainfall data, a continuous simulation can also use temperature and evaporation data. It’s also required to setup the starting and ending date. To create a continuous simulation, click the Run button located at the Simulation tab to open the Batch Run…
9.3 Continuous Simulation Outputs
User’s Manual » 9 Working with Output » 9.3 Continuous Simulation Outputs
There are two main differences between the output from continuous simulation and single-event simulation. The summary data is for the long-term time-series data including the water balance. Most of the summary data is on average annual basis. One hydrological…
A.4 Calibrate Commands
User’s Manual » 12 Appendix A – Tools » A.4 Calibrate Commands
For model calibration, a few sensitive parameters may need to be adjusted several times before a good result can be achieved. The adjustment usually comes with a percentage change. To assist on this process, the Calibrate Commands tool can be used. It allows users to…
Analyzing Erosion for New Development
Tutorials » Analyzing Erosion for New Development
Urbanization, in general, increases impervious cover in a watershed. When impervious cover is increased, precipitation does not infiltrate as it would naturally. Instead, rainfall is quickly piped and channelled directly to the watercourse. An increase in surface…
4.1.4 Saving a Project
User’s Manual » 4 Working Projects and Scenarios » 4.1 Projects » 4.1.4 Saving a Project
All changes made to a project are temporary until they are saved. To save changes to the project file, click the Save Project button or menu in Home tab, Quick Access Toolbar or File Menu. The working project can also be saved to another location with the Save…
2.11 Viewing Continuous Simulation Outputs
User’s Manual » 2 Quick Start Tutorial » 2.11 Viewing Continuous Simulation Outputs
The continuous simulation models the water balance in snowpack and active soil zone. All the water balance components are available as time-series data from the outputs. Similar to hydro-graph summary, these water balance components are also summarized to help get the…
A.2 Batch Assign
User’s Manual » 12 Appendix A – Tools » A.2 Batch Assign
Parameter values may be available in another source. If these parameters are in the appropriate order, they can be pasted in Parameter Tables window. If not, they can be assigned to hydro-logic objects using the Batch Assign tool. The Batch Assign tool uses an…
4.1.2 Creating a New Project
User’s Manual » 4 Working Projects and Scenarios » 4.1 Projects » 4.1.2 Creating a New Project
A new project is created automatically when VO is opened. The project type of the default project can be specified in Home toolbar —> Options —> General tab. By default, it’s set as Single-event OTTHYMO. To set up GIS information, please refer to Default…
2.8 Converting to Continuous OTTYHYMO Model
User’s Manual » 2 Quick Start Tutorial » 2.8 Converting to Continuous OTTYHYMO Model
The single-event OTTHYMO model can be converted to continuous OTTHYMO model to run continuous simulation. To do this, first create a Continuous OTTHYMO project using menu File -> New Project -> New Continuous Otthymo Project. Then the single-event model can be…
LIDs and Water Quality Continuous Model
Tutorials » LIDs and Water Quality Continuous Model
This is a follow-up exercise of utorial – LIDs and Water Quality Single-Event Model. The exercise project uses the same model layout and scenarios as in the single-event model, but it uses continuous climate data and we will run the continuous simulation for 1…
Step 2: Add a Background
Tutorials » Creating a VO Model in Schematic View » Step 2: Add a Background
It’s good to have a watershed layout reference when creating the model schematic. VO has the ability to add a picture as the background in the Canvas. A picture is provided for this exercise in the training package located at …\data\Background.JPG. We will use…
Step 2: Add a Background
Tutorials » Modeling a Wetland: Continuous Simulation, Calibration and Hydroperiod Analysis » Step 2: Add a Background
It’s good to have a watershed layout to reference when creating the model schematic. VO has the ability to add a picture in the background of the Schematic view. A picture is provided for this exercise in the training package. To set the background, right-click on…
Step 15: Import the Post-Development Scenarios with Control to the Continuous Project
Tutorials » Analyzing Erosion for New Development » Step 15: Import the Post-Development Scenarios with Control to the Continuous Project
We will go back to the continuous project to evaluate the long-term impact. Save the Single-Event Project Before working on a continuous project, save the single-event project. Click Save Project button in the Home toolbar to save all information (including all…
Step 1: Open a Saved Project
Tutorials » LIDs and Water Quality Single-Event Model » Step 1: Open a Saved Project
Open VO and then select File -> Open Project Navigate to the folder where you have saved this exercise. Open the the model “…/model/solution/Water Quality Model – Single-event.voprj”.
Step 1: Open a Saved Project
Tutorials » LIDs and Water Quality Continuous Model » Step 1: Open a Saved Project
Open VO and then select File -> Open Project Navigate to the folder where you have saved this exercise. Open the the model “…model/solution/Water Quality Model – Continuous.voprj”.
Step 7: Enter the Continuous Monitoring Data
Tutorials » Modeling a Wetland: Continuous Simulation, Calibration and Hydroperiod Analysis » Step 7: Enter the Continuous Monitoring Data
The precipitation, temperature, evapotranspiration, and groundwater data can be added to the model. Those climate data will first be added to the Resource Library and then added from Resource Library to Project Manager. Click Project Manager tab, so later on we can…
Step 2: Create a Top Group
Tutorials » Using Resource Library » Step 2: Create a Top Group
Group works like folders. The Top Group is in the top level and the Sub Group is inside another group. The climate library items could be organized properly with these groups. Create a top group by either of the two ways: 1) click the Top Group button in the toolbar;…
Step 8: Analyze Erosion Indices for Existing Scenario
Tutorials » Analyzing Erosion for New Development » Step 8: Analyze Erosion Indices for Existing Scenario
Scenario Comparison can compare RouteChannel results in three erosion indices: Time of Exceedance, Cumulative Erosion Index and Cumulative Effective Work Index. Click Scenario Comparison button in the Simulation toolbar. In the opened Scenario Comparison window,…
Step 4: Add Precipitation and Temperature Data to the Project
Tutorials » Working with a Continuous Model » Step 4: Add Precipitation and Temperature Data to the Project
Select the precipitation data “TORONTO_AIRPORT_PRECIP” and add it to the Project Manager by one of the following three ways: Right click the selected rain data to open the context menu and select Add to model… Click the Add to Model button at the…
Clipping a Raster in VO
Tutorials » Clipping a Raster in VO
In this tutorial, we will learn how to clip a raster file using VO. Clipping allows us to extract a specific area of interest from a larger DEM file. To perform this task, you will need a DEM file and a polygon shape file to define the clipping area. Step 1: Download…
3.13 Project Manager
User’s Manual » 3 Conceptual Model » 3.13 Project Manager
The Project Manager is to manage the scenarios and climate data in the project. By default, it’s located on the right-hand side besides the Properties window. THE PROJECT MANAGER IN CONTINUOUS OTTHYMO PROJECT HAS THREE MORE SECTIONS (TEMPERATURE DATA, EVAPORATION…
10.1 Project Files
User’s Manual » 10 Visual OTTHYMO Files » 10.1 Project Files
The project files are used to save all project data including: All hydrologic objects in each scenario All climate data The locations (on map and on canvas), labels, links and symbols are all saved in the project file. There are two project files in the project…
4.1.1 Project Types
User’s Manual » 4 Working Projects and Scenarios » 4.1 Projects » 4.1.1 Project Types
There are two project types available in VO6: Classic Single-Event OTTHYMO – For single-event simulation with design storms. Typically used for quantifying control purpose. Continuous OTTHYMO – For continuous simulation with long-term climate data. It can be…
Saving the Project
Tutorials » Generating Subcatchments in Urban Areas with VO GIS Tools » Saving the Project
Before proceeding with automatic subcatchment generation, it is highly recommended to save your project to avoid any data loss. 1. Click on the “Save” button located at the top left corner of the software’s interface. 2. Choose a suitable location on…
Step 1: Create a New Single-Event Project
Tutorials » Analyzing Erosion for New Development » Step 1: Create a New Single-Event Project
The single-event model will be used to verify the model performance under design storms, for example, using it for pond sizing under 4-hour Chicago design storms with 20mm, 25mm and 30mm respectively. To create a new single-event project, navigate to File tag at the…
Creating a VO Model in Schematic View
Tutorials » Creating a VO Model in Schematic View
In this exercise, we will create a VO model for the watershed shown below. It has two urban sub-catchment (1003 and 1005) and three rural sub-catchments (1001, 1002 and 1004). This exercise will mainly focus on the basic operation of VO. Default parameters and…
Step 2: Create a Scenario for the Existing Conditions
Tutorials » Analyzing Erosion for New Development » Step 2: Create a Scenario for the Existing Conditions
In the Project Manager, rename the Scenario1 as “Existing”. We will use this scenario to create a scenario for existing conditions. To rename the scenario, click on the scenario, then right click to open context menu and select Rename from the context…
6.9.2 Sink and Flat Analysis
User’s Manual » 6 Working with the Map » 6.9 Rural DEM Processing » 6.9.2 Sink and Flat Analysis
In hydrological analysis, it is crucial to start with a depressionless Digital Elevation Model (DEM) to ensure accurate results. These steps are essential for tasks such as determining flow directions and accumulations and delineating drainage networks and basins. Step…
Step 1: Open VO and Create a new Otthymo Project
Tutorials » Creating a VO Model in Schematic View » Step 1: Open VO and Create a new Otthymo Project
Navigate to File tag at the top and create a New Otthymo Project
2 Quick Start Tutorial
User’s Manual » 2 Quick Start Tutorial
This Chapter provides a tutorial on how to use Visual OTTHYMO. By following along with this chapter, you can quickly learn about the steps involved in building a model.
4 Computation of Rainfall Losses
Reference Guide » 4 Computation of Rainfall Losses
This section introduces how to calculate rainfall losses by curve number and Horton’s equation.
4 Working Projects and Scenarios
User’s Manual » 4 Working Projects and Scenarios
This chapter discusses how to use projects and scenarios to manage multiple models, such as models for existing and post-development condition. To the user, a project may represent a specific type of work which consists of multiple hydrologic models. Each model in a…
Step 4: Adjust Schematic Layout
Tutorials » Sizing a Pond Using the Route Reservoir Command » Step 4: Adjust Schematic Layout
Convert hydrograph commands for developed areas to StandHyds. Right click on NasHyd 1003 and select convert to StandHyd. Repeat for NasHyd 1005. You will see the NasHyd commands are changed to NasHyd commands. Delete the link from StandHyd 1003 to RouteChannel…
Step 4: Create a Route Wetland Downstream of the Rural Subcatchment
Tutorials » Modeling a Wetland: Continuous Simulation, Calibration and Hydroperiod Analysis » Step 4: Create a Route Wetland Downstream of the Rural Subcatchment
Find RouteWetland under the Routes section in the Tool Box. Drag and drop the RouteWetland command from the Tool Box to the Schematic view. Place it over the wetland area that is highlighted with green boundary in the background image. Click the RouteWetland…
Step 17: Compare Erosion Indices for Existing Scenario, Post Scenario and Control Scenarios
Tutorials » Analyzing Erosion for New Development » Step 17: Compare Erosion Indices for Existing Scenario, Post Scenario and Control Scenarios
Scenario Comparison can compare RouteChannel results in three erosion indices: Time of Exceedance, Cumulative Erosion Index and Cumulative Effective Work Index. Click Scenario Comparison button in the Simulation toolbar. In the opened Scenario Comparison window,…
4.1.3 Opening an Existing Project
User’s Manual » 4 Working Projects and Scenarios » 4.1 Projects » 4.1.3 Opening an Existing Project
To open an existing project, click the Open Project button or menu in Home tab, Quick Access Toolbar or File Menu. The Open window will appear to browse VO project files (*.voprj). VO maintains a recent project file list. When a project is opened at the first time,…
Step 1: Set VO Map Options and Create a New Project
Tutorials » Creating a VO model with Existing GIS Data » Step 1: Set VO Map Options and Create a New Project
Open Option in the Home tab Make sure the General and GIS setting as below: Close VO and reopen it. Make sure you can see the Map tab in the canvas and it is centered on the Toronto area by default. To create a new project, navigate to File -> New Project…
Step 10: Compare Erosion Indices for Existing Scenario and Post-Development Scenario without Control
Tutorials » Analyzing Erosion for New Development » Step 10: Compare Erosion Indices for Existing Scenario and Post-Development Scenario without Control
We will compare the three erosion indices: Time of Exceedance, Cumulative Erosion Index and Cumulative Effective Work Index, for existing scenario and post-development scenario without control. VO uses the results of one pre-development scenario to calculate…
Step 2: Add GIS layers
Tutorials » Creating a VO model with Existing GIS Data » Step 2: Add GIS layers
Open the Add Layer tool in GIS ribbon. In the popped-up window, select all the shapefiles in the GIS data folder. After importing, the added layers will be displayed in the map tree on the left. Right click on any imported layer and select Zoom to Layer to see the…
Step 16: Save and Close Project
Tutorials » Modeling a Wetland: Continuous Simulation, Calibration and Hydroperiod Analysis » Step 16: Save and Close Project
Since all work is done, we want to save all of our works. Click Save Project button in the Home toolbar to save all information (including all commands and storms) to a project file. Now, it’s safe to close the application.
Step 16: Save and Close Project
Tutorials » LIDs and Water Quality Single-Event Model » Step 16: Save and Close Project
Since all work is done, we want to save all of our works. Click Save Project button in the Home toolbar to save all information (including all commands and storms) to a project file. Now, it’s safe to close the application.
Step 4: Create NasHyd for Rural Catchment
Tutorials » Creating a VO Model in Schematic View » Step 4: Create NasHyd for Rural Catchment
Use the same method to create the three NasHyds. Select the NasHyd in the tool box as shown below. Rename them as 1001, 1002 and 1004. Spend time to explore the parameters of NasHyd and see what are the differences as compared to StandHyd. After this step, the…
Step 5: Water Balance Analysis for Bioretention Tank
Tutorials » LIDs and Water Quality Continuous Model » Step 5: Water Balance Analysis for Bioretention Tank
We will investigate how LIDs can improve on runoff controls by comparing water balance distributions before and after the LIDs. Click on the scenario tab “Post-Dev. Solved” on the Schematic view to show the post-development scenario with LIDs. Zoom…
Step 12: Save and Close the Project
Tutorials » Creating a VO Model in Schematic View » Step 12: Save and Close the Project
Since all the work is done, we want to save all of our work. Click the Save Project button to save all information (including all hydrologic objects and storms) to a project file. Now, it’s safe to close the application.
2.2 Project Setup for Single-Event Model
User’s Manual » 2 Quick Start Tutorial » 2.2 Project Setup for Single-Event Model
To create a single-event OTTHYMO project, select File -> New Project -> New Otthymo Project. To have a reference to place the hydrologic objects, a background picture can be added to the canvas. To add the background, switch to Schematic View and choose…
Step 9: Save Project and Run Simulation
Tutorials » Creating a VO model with Existing GIS Data » Step 9: Save Project and Run Simulation
Run the model using the Run button in the Simulation toolbar. Click the Save button in the Home toolbar to save the project. For information about how to load different rain data from Resource Library, view the exercise Using Resource Library
Step 4: Add Design Storms from STM Files
Tutorials » Using Resource Library » Step 4: Add Design Storms from STM Files
The STM files could be added to Resource Library as a Read-in design storm. To read from STM files, select the Sub Group created in previous step, i.e. “STM” in this exercise, right click to open context menu and choose Add New Design Storm – From…
Step 4: Assign Land Use for Hydrograph Commands
Tutorials » LIDs and Water Quality Single-Event Model » Step 4: Assign Land Use for Hydrograph Commands
Select the NasHyd command “Farm Field 1” and open the Properties menu. At the bottom of the Properties menu there is a heading for Water Quality. Select the button next the LandUse field and you will see a window with a list of land uses which match those…
2 Tips for Modeling Ungauged Urban Catchments
Reference Guide » 2 Tips for Modeling Ungauged Urban Catchments
This section provides direction for modelers who are modeling ungauged urban catchments. In most cases, urban catchments are not gauged since the response to rainfall can be accurately simulated. However, like any model the user should be aware that the inappropriate…
Step 2: Open the Pre-development Scenarios
Tutorials » LIDs and Water Quality Single-Event Model » Step 2: Open the Pre-development Scenarios
The model should open with a scenario called “Pre-Dev. Initial”. If you have a different scenario open, complete the following steps: 1. Open the Project Manager window. 2. If the Project Manager window is open but not showing, it may be hidden behind…
4.3 Infiltration Procedures in STANDHYD
Reference Guide » 4 Computation of Rainfall Losses » 4.3 Infiltration Procedures in STANDHYD
In VO STANDHYD is usually used to model the catchment of urban area. This section introduces the calculation procedure of STANDHYD infiltration loss.
Export Generated Layers in VO
Tutorials » Generating Subcatchments in Urban Areas with VO GIS Tools » Export Generated Layers in VO
To export generated layers in VO, follow these steps: 1. Locate the layer that you want to export in the software interface. 2. Right-click on the layer to open the context menu. 3. From the context menu, select “Layer Export.” This option allows you to…
View Layer in Google Earth
Tutorials » Generating Subcatchments in Urban Areas with VO GIS Tools » View Layer in Google Earth
To view your layer in Google Earth using VO, please follow these steps: 1. Make sure you have Google Earth installed on your system. If you haven’t installed it yet, you can do so by visiting the Google Earth website and downloading the appropriate version for…
Step 2: Run Simulation for Pre-Development Conditions
Tutorials » LIDs and Water Quality Continuous Model » Step 2: Run Simulation for Pre-Development Conditions
By default the model should open with a scenario called “Pre-Dev. Solved”. If you have a different scenario open, find the scenario under the Drainage Network Scenarios group in the Project Manager. Double-click the scenario to open it in Schematic view. If…
Step 4: Run Simulations for Post-Development Conditions with LIDs
Tutorials » LIDs and Water Quality Continuous Model » Step 4: Run Simulations for Post-Development Conditions with LIDs
Following the similar procedure to run and view results for the scenario of post-development conditions with LIDs. Find the scenario “Post-Dev. Solved” under the Drainage Network Scenarios group in the Project Manager. Double-click the scenario to open it…
Step 2: Add Precipitation Data to the Resource Library
Tutorials » Working with a Continuous Model » Step 2: Add Precipitation Data to the Resource Library
Open the Resource Library by clicking the Resource Library button in the toolbar. Create a Top Group and rename it as exercise. Keep the group selected and then add a Rain Gauge by either of the following two ways: 1) click Rain Gauge button in the toolbar; 2)…
I would like to save the Hydrograph data from a Route Channel in one VO model and then use it for a READ HYD in another VO model. In the VO manual it says there is a “Save Hyd command located in the Hydrograph Data form”, but I can’t seem to find this.
FAQ » I would like to save the Hydrograph data from a Route Channel in one VO model and then use it for a READ HYD in another VO model. In the VO manual it says there is a “Save Hyd command located in the Hydrograph Data form”, but I can’t seem to find this.
unfortunately, it is not possible to do it with VO 6 yet. You need to save the result. Afterward, use the following link to prepare a suitable format for “READ HYD”. Hydrograph Files
9.5 Modeling a Wetland
Reference Guide » 9 Water Balance Processes in Continuous Simulation » 9.5 Modeling a Wetland
The wetland command in VO is designed to mimic a natural wetland, with a wet storage area surrounded by a dry vegetated area. The storage area and dry area are both dynamic in order represent the flooding and drying out seen in many natural wetlands. The way this…
A.5 Scenario Comparison
User’s Manual » 12 Appendix A – Tools » A.5 Scenario Comparison
Scenario Comparison tools allows to compare model results of different scenarios at a certain location. For example, you could compare the peak flow at your site outlet from pre-development condition and post-development condition with a pond. Engineers could setup the…
8 Running a Simulation
User’s Manual » 8 Running a Simulation
This chapters discusses the steps to create and run a simulation after the drainage network has been created and climate data has been added.
6.3.5 Adding a Layer
User’s Manual » 6 Working with the Map » 6.3 Using Layers » 6.3.5 Adding a Layer
To add a layer, use the following button from Add Layer sub-menus in GIS tab: Feature Layer button to add any supported GIS data files. Group Layer button to add a new group layer. Basemap Layer button to add the base map layer (Available only in ArcGIS). The…
A.7 Pond Sizing
User’s Manual » 12 Appendix A – Tools » A.7 Pond Sizing
Users can use Pond Sizing tool to size rating curve for the selected reservoir. The purpose of this tool is to get a rating curve table that can match the peak flow under different runs between existing scenario (target scenario) and current scenario (active scenario).…
A.6 Save Selection
User’s Manual » 12 Appendix A – Tools » A.6 Save Selection
Users can save their selected objects into Selected Data section in Project Manager, so those selected objects can be reloaded from the Project Manager in the future. To do this, navigate to GIS toolbar -> Save Selection . Click this button to open a window that will…
A.3 Batch Edit
User’s Manual » 12 Appendix A – Tools » A.3 Batch Edit
After selecting multiple commands, users can use Batch Edit to edit the parameters of selected commands in a batch. To use Batch Edit tool, first select commands. Then, right-click on the Schematic or Map View to open context menu and select Batch Edit. Users can…
6 Routing Options in Visual OTTHYMO
Reference Guide » 6 Routing Options in Visual OTTHYMO
*METHOD *BRIEF DESCRIPTION *COMPLEXITY SHIFT HYDROGRAPH A simple translation of the hydrograph. Does not attenuate the peak discharge. LOW ROUTE CHANNEL Combines the three routing commands of HYMO into a single…
9.2.1.1 Viewing Summary Data in Table
User’s Manual » 9 Working with Output » 9.2 Single-Event Simulation Outputs » 9.2.1 Summary Data » 9.2.1.1 Viewing Summary Data in Table
To view the summary data in a table, use the Hydrograph Result window at the bottom besides the Parameter Tables window. It shows the summary data of all objects in the model. On the top of the window, there are two options to specify the run and switch to show all…
9.2.1.2 Viewing Summary Data in Label
User’s Manual » 9 Working with Output » 9.2 Single-Event Simulation Outputs » 9.2.1 Summary Data » 9.2.1.2 Viewing Summary Data in Label
VO can provide labels for each object on Schematic View, on an individual basis or all command basis. The label content includes the NHYD, name, and hydrograph summary data. To create labels: Select the objects you wish to create a label for. Right-click and select…
7.5.4.1 New Read-In Design Storm
User’s Manual » 7 Working with Resource Library » 7.5 Adding New Items » 7.5.4 Adding Design Storm » 7.5.4.1 New Read-In Design Storm
The window for new read-in storm is shown in the figure below. It allows users to create a name and browse the data file for preview. Click the Browse … button in the window to browse the data file to display it in the Data Preview area at the bottom as shown below.…
Step 2: Get Target Peak Flow from Pre-development Conditions
Tutorials » Sizing a Pond Using the Route Reservoir Command » Step 2: Get Target Peak Flow from Pre-development Conditions
Click on the RouteChannel 2002 on the schematic canvas and the select Hydrograph Result in the Simulation tab. Under the Hydrograph Results (Instantce) tab, click on Show All Runs and a summary of calculated hydrograph results for each design storm will appear in the…
4.4 Considerations in Using the Rainfall Losses
Reference Guide » 4 Computation of Rainfall Losses » 4.4 Considerations in Using the Rainfall Losses
For flood control purposes and master drainage planning, there are both rural and urban areas in the watershed. In Visual OTTHYMO, the rainfall losses in the rural areas are computed by means of the CN* procedure. The critical storms for rural conditions are…
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…
Step 3: Add Water Quality in Model
Tutorials » LIDs and Water Quality Single-Event Model » Step 3: Add Water Quality in Model
This table contains TP and TSS loading rates for different land uses in mg/L. We will be using the default water quality table found in the Resources Library, however users may duplicate this table and edit/add land use types and loading rates. If you choose to…
12 Appendix A – Tools
User’s Manual » 12 Appendix A – Tools
As stated in Chapter 4, hydrologic object parameters can be edited directly in Properties window and Parameter Tables window. In some cases (e.g. model calibration), the parameter values may need to be changed by a certain percentage. Tools have been provided to make…
A.1 Convert to CN*
User’s Manual » 12 Appendix A – Tools » A.1 Convert to CN*
In the SCS runoff equation, it is assumed that the initial abstraction equals to 0.2×S, where S is the potential maximum retention. However, it has been found that it may underestimate the runoff volume. To fix this problem, OTTHYMO allows user to assign the initial…
4.2.1 Creating a New Scenario
User’s Manual » 4 Working Projects and Scenarios » 4.2 Scenarios » 4.2.1 Creating a New Scenario
To create an empty scenario, click the Add button at the top of the Project Manager or select Add menu from the context menu. The Scenario Create window will appear. Enter the name and description and click OK button to create the scenario. The new scenario will be…
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…
1.7.1 What’s New in Version 6.0
User’s Manual » 1 Introduction » 1.7 What’s New » 1.7.1 What’s New in Version 6.0
For Visual OTTHYMO 6.0 (VO) we have added low impact development (LID), Water Quality calculations to the model, in-built TatukGIS map, Compound Channel, Erosion Index as well as various bug fixes. LID design tools are built to assist engineers in meeting the…
6.5 Updating Hydrologic Object Location in Schematic View
User’s Manual » 6 Working with the Map » 6.5 Updating Hydrologic Object Location in Schematic View
The location of hydrologic objects in schematic view can be determined based on their geospatial location on map. As a result, the hydrologic objects will be in a similar location in schematic view, making the comparison easier. To update the location, choose the…
1.7.3 What’s New in Version 6.2
User’s Manual » 1 Introduction » 1.7 What’s New » 1.7.3 What’s New in Version 6.2
The biggest change of VO6.2 from VO6.1 is to include another engine VO-SWMM. Therefore, with one installer and platform, user can have access to two engines: OTTHYMO engine and VO-SWMM engine. For more details, please refer to VO-SWMM Manual and VO-SWMM…
1.7.2 What’s New in Version 6.1
User’s Manual » 1 Introduction » 1.7 What’s New » 1.7.2 What’s New in Version 6.1
For Visual OTTHYMO 6.1 (VO) we have added scenario comparison to single-event and continuous models., upgraded continuous modeling by including GIS tool and hydrograph commands of ScsHyd and NasHyd, improved LID package, expanded the data exporting/importing function…
5.7.2 Estimation of Time to Peak (Tp) in NASHYD
Reference Guide » 5 Unit Hydrograph Options in Visual OTTHYMO » 5.7 Unit Hydrograph Options for Rural Areas » 5.7.2 Estimation of Time to Peak (Tp) in NASHYD
It is, of course, best to obtain Tp by calibration with measurements. If data is available, the following procedure may be utilized to estimate Tp. DEFINITION OF TIME LAG The first step involves determining the time lag which is defined as the time difference…
Generating Subcatchments in Urban Areas with VO GIS Tools
Tutorials » Generating Subcatchments in Urban Areas with VO GIS Tools
This tutorial will guide you through the necessary steps to generate subcatchments automatically in urban areas using high-resolution DEM files. Let’s get started!
Generating Subcatchments in Rural Areas with VO GIS Tools
Tutorials » Generating Subcatchments in Rural Areas with VO GIS Tools
This tutorial will walk you through the step-by-step process of automatically generating subcatchments in rural areas using VO. By following these instructions, you’ll be able to conduct large-scale studies with ease. Step 1: Importing the DEM File 1. Start by…
8 A Review of Design Storm Profiles
Reference Guide » 8 A Review of Design Storm Profiles
This chapter provides a careful review of different design storms.
7.6.1 Coping and Pasting A, B, C
User’s Manual » 7 Working with Resource Library » 7.6 Assigning IDF to Chicago Design Storm » 7.6.1 Coping and Pasting A, B, C
To copy and paste A, B, C from an IDF curve to a Chicago design storm: Select the desired IDF curve in Library Explorer. In the Main View, click the Copy A,B,C button to copy the A, B, C values. Note that if the fitted A, B, C is invalid, the values can’t be…
Currently, I am developing a continuous model. I want to assign the LU to each catchment; but the classifications are Open Land, Grass Land, Light Forest, Heavy Forest, and Crops up to shoulder height. Could you please tell me where exactly this LU is use
FAQ » Currently, I am developing a continuous model. I want to assign the LU to each catchment; but the classifications are Open Land, Grass Land, Light Forest, Heavy Forest, and Crops up to shoulder height. Could you please tell me where exactly this LU is use
Land Use is generally used for: a. Water quality purposes and b. Runoff purposes (to calculate Curve Number (also known as CN) when the SCS equation is used). Water Quality purposes: For any hydrograph commands (e.g., StandHyd, NasHyd, etc.), at the bottom of the…
Sizing a Pond Using the Route Reservoir Command
Tutorials » Sizing a Pond Using the Route Reservoir Command
In this exercise, we will build upon the skills learned in previous exercises (Creating a VO Model in Schematic View and Using Resource Library) to learn how to design a pond using the Route Reservoir command. The Route Reservoir command in VO can be used to size the…
Creating a VO model with Existing GIS Data
Tutorials » Creating a VO model with Existing GIS Data
In this exercise, we will create a VO model in the map view, where a model can be created by manipulating the GIS features. Not only can GIS data be used to create the model structure but it also can be used to calculate parameter values. Please download the…