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6.6.2 Calculating Area Weighted
User’s Manual » 6 Working with the Map » 6.6 Using GIS Tools » 6.6.2 Calculating Area Weighted
In some cases, model parameters are available in GIS layers. The Calculate Area Weighted tool reads the parameter values, calculate the area weighted value if necessary and then assign to catchments. The imperviousness (TIMP and XIMP) and initial abstraction are two…
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.…
Step 6: View Results
Tutorials » Working with a Continuous Model » Step 6: View Results
The outputs are available in time series and summary format. The time series can be viewed by selecting a command and using the Hydrograph, Plot Results, and Plot Calibration tools. The summary outputs are available in the Water Balance table. The Hydrograph tool…
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…
Step 6: Setup Symbols
Tutorials » Creating a VO model with Existing GIS Data » Step 6: Setup Symbols
You may also want to change the layer symbols to increase the contrast between them. Select the layer in map tree and then right click the mouse to open the context menu. Select Layer Properties in the context menu. In the Layer Properties window, click the symbol…
Step 6: Create IDF Group
Tutorials » Using Resource Library » Step 6: Create IDF Group
IDF data includes the rainfall intensity for various return periods. In Resource Library, the rainfall intensities of a certain return period are represented as an IDF Curve. A group of IDF Curves of different return periods is an IDF Group. Each IDF Curve could be…
Step 6: Size the pond
Tutorials » Sizing a Pond Using the Route Reservoir Command » Step 6: Size the pond
The Route Reservoir command uses a Discharge-Storage Rating Curve to represent flows out of the pond and storage within the pond. The general idea of pond sizing is to adjust this rating curve so that the requirement on target flow control can be satisified. In this…
6 Working with the Map
User’s Manual » 6 Working with the Map
With VO 6.0, 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. Note that an ArcGIS license is required to use the ArcGIS map. Map is another way to…
6.6.1 Calculating CN
User’s Manual » 6 Working with the Map » 6.6 Using GIS Tools » 6.6.1 Calculating CN
Curve Number (CN) is the most important parameter to determine surface runoff when SCS equation is used. Its value varies for different soil types, land use, and Antecedent Soil Moisture Condition (AMC). The CN for the average antecedent soil condition (CNII) is…
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…
8.7 SCS 6-Hour Design Storm
Reference Guide » 8 A Review of Design Storm Profiles » 8.7 SCS 6-Hour Design Storm
This is a second type of design storm developed by the U.S. Soil Conservation Service. The SCS 6-hour design storm was developed for designing small dams. The duration is selected as 6 hours or the time of concentration, whichever is larger. The rainfall depth is…
6.6.3 Calculating Landuse Percentage
User’s Manual » 6 Working with the Map » 6.6 Using GIS Tools » 6.6.3 Calculating Landuse Percentage
In some cases, model parameters are available in GIS layers. The Calculate LandUse Percentage tool reads the parameter values, calculate the area weighted value if necessary and then assign to catchments LandUse. To use this tool: Add the GIS layer that has the…
Step 6: Create and Run Post-development Model
Tutorials » LIDs and Water Quality Single-Event Model » Step 6: Create and Run Post-development Model
Open the scenario “Post-Dev. Initial” which is shown in the Project Manager window. Run the simulation by clicking the Run button in the Simulation toolbar, and the results will display in labels. This model is the same as the “Pre-Dev.…
Step 6: Setup and Run Simulation for Model Calibration
Tutorials » Analyzing Erosion for New Development » Step 6: Setup and Run Simulation for Model Calibration
Click on the Existing scenario tab to show the Schematic view of the existing scenario, because we will use the Existing scenario for model calibration. Click the Run button located at the Simulation tab. In the opened Batch Run window, make sure your setting is…
Step 6: Connect the NasHyd to the Downstream Route Wetland
Tutorials » Modeling a Wetland: Continuous Simulation, Calibration and Hydroperiod Analysis » Step 6: Connect the NasHyd to the Downstream Route Wetland
Hoover mouse over the NasHyd command. While the mouse cursor changes to a cross, hold left-click and drag a connector from the NasHyd to the RouteWetland command. Release the mouse left-click when the connector arrow is dragged onto the RouteWetland. The model should…
2.1 Example Study Area
User’s Manual » 2 Quick Start Tutorial » 2.1 Example Study Area
In this tutorial, we will create a single-event VO model for the watershed shown below. It has two urban catchments (1003 and 1005) and three rural catchments (1001, 1002 and 1004). We will then run the simulation with 2-100yr design storms. The model is then converted…
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…
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.
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 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…
9.4.1 Water Contributed from Indirectly Connected Impervious Area
Reference Guide » 9 Water Balance Processes in Continuous Simulation » 9.4 Active Soil Zone Water Balance » 9.4.1 Water Contributed from Indirectly Connected Impervious Area
ICRO is the net contribution of water from impervious surfaces onto pervious surfaces referred to as ‘indirectly connected impervious areas’. This net factor accounts for several physical conditions reduce the impacts of indirectly connected impervious areas on…
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;…
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…
Step 5: Edit the RouteWetland Discharge and Depth-Area Curves
Tutorials » Modeling a Wetland: Continuous Simulation, Calibration and Hydroperiod Analysis » Step 5: Edit the RouteWetland Discharge and Depth-Area Curves
Discharge Curve To edit Discharge Curve of RouteWetland, click the button next to the Discharge Curve field in the Properties tab to open the Discharge Curve Editor window. Find the discharge curve table at “…\data\discharge curve.csv”. Copy…
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 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)…
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…
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…
Step 5: Run the Simulation for Pre-development Scenario
Tutorials » LIDs and Water Quality Single-Event Model » Step 5: Run the Simulation for Pre-development Scenario
Once you have entered all the land use data for your NasHyd commands, save your model and run the simulation. Select Run from the Simulation toolbar and you will see the following window. Under the dropdown menu for water quality select “New WaterQuality” for each…
8.5.2 Parameter Estimation
Reference Guide » 8 A Review of Design Storm Profiles » 8.5 Chicago Design Storm » 8.5.2 Parameter Estimation
The procedure for determining the constants for the empirical IDF curve was discussed previously in the Intensity Duration Frequency Curves section. The only constant that is required for the Chicago design storm is the ratio of the time before the peak to the storm…
2.3 Creating Drainage Network on Canvas
User’s Manual » 2 Quick Start Tutorial » 2.3 Creating Drainage Network on Canvas
All available hydrologic objects are list in ToolBox on the left. To add one hydrologic object on canvas in Schematic View, drag and drop it onto the canvas. Then it can be moved to any location. The study area has two urban catchments, three rural catchments,…
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…
Step 11: Set Parameters for Rain Garden
Tutorials » LIDs and Water Quality Single-Event Model » Step 11: Set Parameters for Rain Garden
Rain Garden in VO does not have an option for entering a underdrain or outflow structure. If these are included in your design, you should use the Bioretention command. The only runoff leaving a Rain Garden is the overflow. 1. Calculate the required total volume 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 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…
3.10 Overview
User’s Manual » 3 Conceptual Model » 3.10 Overview
The interface has been designed to provide plenty of working space for the schematic and map model while maintaining easy access to the hydrologic objects and their associated parameters. The layout consists of various sections as explained in the text below. Most of…
6.6.7 Import Layer
User’s Manual » 6 Working with the Map » 6.6 Using GIS Tools » 6.6.7 Import Layer
Use Import Layer to directly import shapefile and assign them to model commands. To use this tool: Click the Import Layer button from the GIS ribbon Choose which Layer the imported layer will be used for Click the button next to the Input Source. In the open…
3.2 Visual OTTHYMO Hydrologic Objects Overview
User’s Manual » 3 Conceptual Model » 3.2 Visual OTTHYMO Hydrologic Objects Overview
The drainage system component and the corresponding Visual OTTHYMO hydrologic objects are listed in Table 3-1. The hydrologic processes modelled are given below each hydrologic object, which are 1) flow generation, 2) flow routing, 3) flow separation and 4) flow…
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 modeler. It should be noted that most methods of estimate TP,…
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…
6.9 Rural DEM Processing
User’s Manual » 6 Working with the Map » 6.9 Rural DEM Processing
The typical hydrologic analysis workflow consists of several steps, starting with the preparation of a digital elevation model (DEM) and followed by channel network extraction, basins and watersheds delineation, and vectorization of the results. The automated…
Step 9: Set Parameters for Bioretention Tank
Tutorials » LIDs and Water Quality Single-Event Model » Step 9: Set Parameters for Bioretention Tank
The sizing of Bioretention is based on the Sustainable Technologies Evaluation Program (STEP) recommendations. Default parameters from VO are used except the followings: Surface Ponding Layer: Depth – Area Curve: Mulch Layer: Depth is 0.075…
6.6 Using GIS Tools
User’s Manual » 6 Working with the Map » 6.6 Using GIS Tools
GIS tools take advantage of GIS data to help with model parameterization and calibration. Calculate CN – Assigns CNII to catchments based on land use and soil layer. It also has a built-in lookup table. Calculate Area Weighted – Assigns catchment parameters…
1.7 What’s New
User’s Manual » 1 Introduction » 1.7 What’s New
Please find the new features of each version in the following chapters: What’s New in Version 6.0 What’s New in Version 6.1 What’s New in Version 6.2
1.6 Installing Visual OTTHYMO
User’s Manual » 1 Introduction » 1.6 Installing Visual OTTHYMO
Follow the requirements and steps to install VO on your computer. Hardware and Software Requirements Licensing System Installing VO Running VO Uninstalling VO
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.…
3.11 Toolbox
User’s Manual » 3 Conceptual Model » 3.11 Toolbox
The following tables list the hydrologic objects from the Toolbox and their name. Hydrologic objects with bold font can be used in both single-event and continuous simulation. Users of previous versions of Visual OTTHYMO and OTTHYMO will recognize these commands. For a…
6.10 Raster to Contour
User’s Manual » 6 Working with the Map » 6.10 Raster to Contour
The following steps will guide you through the process of creating contour lines or polygons based on DEM grid data using the “Raster to Contour” tool in your GIS software. Contour lines or polygons represent elevation information and can be valuable for…
6.4.8 Moving, Editing and Deleting Hydrologic Objects
User’s Manual » 6 Working with the Map » 6.4 Using the Map » 6.4.8 Moving, Editing and Deleting Hydrologic Objects
The shape of the hydrologic object features can be edited and deleted on the map. To do this: Select Edit Tool in GIS tab or map context menu. Select the hydrologic object feature on map. To move a feature, move the cursor on top of the selected feature and then…
6.6.8 Export Layer
User’s Manual » 6 Working with the Map » 6.6 Using GIS Tools » 6.6.8 Export Layer
Use Export Layer to directly export a layer as shapefile together with a CSV file. To use this tool: Expand the layer table of the Map and click on the layer that is to be exported. For example, in the figure below, the layer NasHyd is selected. Use either of the…
3.14.3 Editing Loss Routine of STANDHYD
User’s Manual » 3 Conceptual Model » 3.14 Properties » 3.14.3 Editing Loss Routine of STANDHYD
The LOSS property of StandHyd is to change the loss routine for pervious area. As different parameters are used in these routines, it needs to be edited in a separate editor. To edit the LOSS routine, click on the button to open the LOSS Editor where the LOSS routine…
1.2 About the User’s Manual
User’s Manual » 1 Introduction » 1.2 About the User’s Manual
The manual is divided into chapters and does not necessarily have to be read from start to finish. Users that are familiar with previous releases of Visual OTTHYMO can probably learn how to navigate around the model on their own and need only refer to the guide for new…
Generate Subcatchments
Tutorials » Generating Subcatchments in Urban Areas with VO GIS Tools » Generate Subcatchments
To automatically generate subcatchments and assign them to Junctions using the “Generate Catchments” feature under the “Urban DEM Processing” in VO, follow these steps: 1. Select “Generate Catchments” from the “Urban DEM…
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…
2.1 Imperviousness
Reference Guide » 2 Tips for Modeling Ungauged Urban Catchments » 2.1 Imperviousness
There are two impervious ratios required, the amount of directly connected imperviousness, XIMP, and the total imperviousness, TIMP. XIMP must be less than or equal to TIMP. TIMP is a function of the land use of the catchment. Land use is a planning term that…
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 14: Display Results by Labels
Tutorials » LIDs and Water Quality Single-Event Model » Step 14: Display Results by Labels
1. Select all the commands on the canvas 2. Right click to open context menu and click Set Labels… 3. Select the labels to be displayed from Available Properties window. Hold Ctrl for multiple selection. Drag the selected properties from Available…
I have created an IDF group and would like to create various AES design storms using the group. I am easily able to generate the 1 hr storm but I am not sure how to make the 12 hr Storm. I do not have the option to change the Mass Curve to the 12 hr curve
FAQ » I have created an IDF group and would like to create various AES design storms using the group. I am easily able to generate the 1 hr storm but I am not sure how to make the 12 hr Storm. I do not have the option to change the Mass Curve to the 12 hr curve
The AES is used to create a 1-hr AES design storm. To have a 12-hr design storm, I can recommend you two solutions. First, you can apply “Create SCS Design Storms” or “Create Chicagos Design Storms”. Second, you can calculate your “Mass Design…
6.4.4 Creating Hydrologic Objects with GIS Data
User’s Manual » 6 Working with the Map » 6.4 Using the Map » 6.4.4 Creating Hydrologic Objects with GIS Data
Existing GIS data can be utilized to define hydrologic objects. The data may be created from DEM data using other hydrological analysis toolsets. These datasets usually have a catchment layer, a stream layer, and an outlet layer. They can be imported into VO and used…
3.9.6 BIORETENTION
User’s Manual » 3 Conceptual Model » 3.9 Low Impact Development (LID) » 3.9.6 BIORETENTION
Bioretention areas filter, detain and infiltrate stormwater runoff. Bioretention areas are known for their water quality, quantity and water balance benefits. The LID is designed with an engineered soil layer to store and treat runoff, a storage layer to detain larger…
3.12 Toolbar
User’s Manual » 3 Conceptual Model » 3.12 Toolbar
The following tables list the icons from the Toolbar and their name. There are three (3) tabs in total: Home, GIS and Simulation. A brief description of the contents of these tabs are given in Table 4-3 Table 4-5. For a more detailed description of each Toolbar item,…
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…
3.14.5 CN* Flag
User’s Manual » 3 Conceptual Model » 3.14 Properties » 3.14.5 CN* Flag
When SCS equation is used to calculate the rainfall excess in pervious area, the Curve Number (CN) is the most important parameter. From the early research of OTTHYMO, it has been rec-ommended to use the modified CN, i.e. CN*. VO has provided a tool (Convert to ) to…
6.4.6 Assigning Geometry to Existing Hydrological Objects
User’s Manual » 6 Working with the Map » 6.4 Using the Map » 6.4.6 Assigning Geometry to Existing Hydrological Objects
Hydrologic commands do not have geospatial location information when 1) they are created on canvas or 2) they are imported from an older model. To take advantage of GIS functions, the geospatial location information can be assigned to hydrological objects. There are…
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…
I’m running a VO model with a DIVERT HYD command, and the output to each outlet does not match the input flow table.
FAQ » I’m running a VO model with a DIVERT HYD command, and the output to each outlet does not match the input flow table.
I’m running a VO model with a DIVERT HYD command, and the output to each outlet does not match the input flow table. In this case, QPEAK is 7.01. So, the QPEAK is between 6.18 and 9.33 in the Total column. By interpolation for Flow 1 and Flow 2 (DIVERTHYD),…
3.5.4 ROUTERESERVOIR
User’s Manual » 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. Users can define Shape and Discharge Type on the Properties tab. There are 6 types of shapes that users can select: Unknown, Truncated Triangular Pyramid, Truncated…
5.1 Adding Background
User’s Manual » 5 Working with Canvas » 5.1 Adding Background
A background showing the study area helps the modelers to place the hydrologic objects and the reviewers to quickly understand the model structure. To add the background: Select the Background -> Change Background … menu from the Canvas context menu. Select the…
Step 11: Create Scenarios for Post-Development with Controls in the Single-Event Model
Tutorials » Analyzing Erosion for New Development » Step 11: Create Scenarios for Post-Development with Controls in the Single-Event Model
We will use a pond as a mitigation structure and compare the results from 6 control scenarios, and we will test the mitigation scenarios in the single-event project using 4-hr Chicago design storms: 20mm, 25mm and 30mm. They are differentiated in terms of the Rating…
9.2.3.3 Plot Calibration
User’s Manual » 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…
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…
6.6.6 Query
User’s Manual » 6 Working with the Map » 6.6 Using GIS Tools » 6.6.6 Query
Use the Query tool to search desired commands on the Map. Please note that Query is a GIS tool, so it only works for the commands created on the Map, not for Schematic View. In the Query window, set up your query condition: Choose which Layer to search for the…
Step 7: Add LID Commands
Tutorials » LIDs and Water Quality Single-Event Model » Step 7: Add LID Commands
For this exercise we will be adding a Rain Garden, Filter, and Pond as a treatment train. It should be noted that the rain garden is modeled as a lumped LID to avoid having too many commands in the model. This is done by adding up the storage in all the rain gardens in…
Step 3: Run Simulations for Post-Development Conditions without LIDs
Tutorials » LIDs and Water Quality Continuous Model » Step 3: Run Simulations for Post-Development Conditions without LIDs
Following the similar procedure to run and view results for the scenario of post-development conditions without LIDs. Find the scenario “Post-Dev. Initial” under the Drainage Network Scenarios group in the Project Manager. Double-click the scenario to open…
Tutorials
Tutorials
The following tutorials will help you get familiarized with VO about its basic functions and some advanced tools. In each tutorial, there is a step-by-step instruction and a attachment folder that contains models and data to be used. *ENJOY YOUR LEARNING! Creating a…
7.1.1 Results for the Chicago Design Storm
Reference Guide » 7 Design Storms for Stormwater Management Studies » 7.1 Methodology of Design Storms » 7.1.1 Results for the Chicago Design Storm
J.F. McLarens Ltd. (1978) has conducted studies on catchments in Edmonton and Winnipeg. They found that the ratio of the Chicago storm peak flow to the flows from an historic storm series ranged between 1.0 and 1.2. It was recommended that the Chicago design storm be…
5.2 Adding Hydrologic Objects
User’s Manual » 5 Working with Canvas » 5.2 Adding Hydrologic Objects
Hydrologic objects are added to the Canvas by dragging the hydrologic object’s icon from the Toolbox and then dropping on the canvas. New hydrologic objects can also be created by copying existing objects. To do this: Select the objects to be copied. Multiple…
7.5.6 Adding Precipitation, Temperature, Evaporation, Groundwater and Flow Data
User’s Manual » 7 Working with Resource Library » 7.5 Adding New Items » 7.5.6 Adding Precipitation, Temperature, Evaporation, Groundwater and Flow Data
The monitoring precipitation, temperature and evaporation data is added to corresponding gauges from a data file. To do this: Select the gauge first and then click the proper Read-in button in the Toolbar. In the New Monitored Data window, click the Browse ……
7.5.2 Adding IDF Group
User’s Manual » 7 Working with Resource Library » 7.5 Adding New Items » 7.5.2 Adding IDF Group
An IDF group is a group of IDF curves of various return periods (2-100 year) for the same location or area. To add an IDF group, first select the parent group and then click the IDF Group button in the Toolbar or choose Add New IDF Group in the context menu, which…
5.4 Changing the Location of Hydrologic Objects
User’s Manual » 5 Working with Canvas » 5.4 Changing the Location of Hydrologic Objects
Once objects are on the canvas it can be moved by selecting it and holding the left mouse button to drag it to the desired location. Multiple objects can be moved at the same time. The location of objects can be also adjusted with various Align and Distribute tools in…
6.6.4.1 Adding Rain Gauges
User’s Manual » 6 Working with the Map » 6.6 Using GIS Tools » 6.6.4 Distributed Rainfall Modeling Technique (DRMT) » 6.6.4.1 Adding Rain Gauges
To have a proper rainfall surface, minimum three rain gauges are required. There are two ways to add rain gauges on the Map: Add rain gauges manually Add rain gauges by importing a shapefile Add Rain Gauge Manually Adding a rain gauge is similar to adding other…
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…
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…
5.3 Selecting Hydrologic Objects
User’s Manual » 5 Working with Canvas » 5.3 Selecting Hydrologic Objects
An individual hydrologic object is selected by pressing placing the mouse cursor over the object and clicking the left button. A blue outline will be added to the object icon. INDIVIDUAL OBJECT SELECTION ON CANVAS Multiple objects are selected by holding the CTRL…
3.14.2 Editing Collection Data
User’s Manual » 3 Conceptual Model » 3.14 Properties » 3.14.2 Editing Collection Data
Some properties are a collection of data values, e.g. DIST/ELEV of RouteChannel and Rating Curve of RouteReservoir as shown in the figure below. A text box and a button are usually given to this type of property. The text box shows the number of rows in the collection…
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
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
6.4.7 Decouple Geometry
User’s Manual » 6 Working with the Map » 6.4 Using the Map » 6.4.7 Decouple Geometry
When using the Assign Geometry tool to assign a command on Schematic View to a GIS geometry on the Map, a OTTHYMO Map command will also added to and shown on the map. This Map command is synchronized from the command on Schematic View. If users want to remove the…
5.3 NASH IUH (NASHYD)
Reference Guide » 5 Unit Hydrograph Options in Visual OTTHYMO » 5.3 NASH IUH (NASHYD)
This linear IUH is used mainly for rural areas. With Nash, the peak discharge increases with N and decreases with Tp. Measurements in Ontario and in Switzerland indicate that an average of 3 number of linear reservoirs may be appropriate. The time to peak, Tp, is…
9.3.3.3 Plot Calibration
User’s Manual » 9 Working with Output » 9.3 Continuous Simulation Outputs » 9.3.3 Time Series Plot » 9.3.3.3 Plot Calibration
Similar to the single-event simulation, it is important to compare the observed and simulated time-series data for model calibration. For file format, please refer to 10.3 Calibration Files. As there are more than one time-series data available, it is necessary to…
7.5.4.2 New MASS Design Storm
User’s Manual » 7 Working with Resource Library » 7.5 Adding New Items » 7.5.4 Adding Design Storm » 7.5.4.2 New MASS Design Storm
The window for new MASS design storm is shown in the figure below. The window is similar as the one for read-in design storm. The mass curve file SMT file is supported and the total precipitation can be entered. The format of climate data files can be found in 10.2…
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…
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…
8.3.1 Setting Simulation Engine
User’s Manual » 8 Running a Simulation » 8.3 Continuous Simulation » 8.3.1 Setting Simulation Engine
Continuous simulation has global and command-specific parameters. To change global parameters, click the Engine Options button in Simulation tab. The Simulation Engine window will appear. In the Simulation Engine window, the parameters are grouped to four (4)…
7.3.2 Urban Watersheds
Reference Guide » 7 Design Storms for Stormwater Management Studies » 7.3 Results of Peak Flows from Design Storms and Historic Storm Events » 7.3.2 Urban Watersheds
The dependence of the historic storm flows to the peak intensity and antecedent moisture conditions were examined on the urban catchments. The peak intensity was found to be an important factor in determining the peak flows. The correlation between the peak intensity…
1.3.1 Documentation
User’s Manual » 1 Introduction » 1.3 VO Help Support » 1.3.1 Documentation
Two separate documents are accessible for VO, a User’s Manual and a Reference Guide. This current document, the User’s Manual, contains information on how to use the program and complete descriptions of all features. This manual does not concern the background…
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 OTTHYMO. For VO SWMM, please refer to the VO SWMM Manual and VO SWMM…
9.2.6 Snowpack Compaction
Reference Guide » 9 Water Balance Processes in Continuous Simulation » 9.2 Snow Pack Water Balance » 9.2.6 Snowpack Compaction
As snow accumulates, it settles or compacts under its own weight, or by the action of the wind, resulting in an increase in the dry density and a decrease in the porosity. A growth curve approach was chosen to compute compaction effects. The new relative dry density,…