ISIS 1D. Quick Start Guide. Cost effective, integrated software solutions ch2mhill.com/isis

Transcription

1 ISIS 1D Quick Start Guide Cost effective, integrated software solutions ch2mhill.com/isis

2 Table of Contents Overview Starting ISIS and Basic Concepts How to Run an Existing Model How to Build a Single Channel How to Build a Simple Network How to Add Weirs to the River Model How to Run a Flow Model How to View the Simulation Results Further Information e-learning River Hydraulics with ISIS Page i

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4 Overview This Quick Start Guide enables first time users to quickly understand how to use ISIS to construct and run simple river models. The guide explains some of the basic concepts of ISIS model construction and the various files used to run a model, also included is a step-by-step guide for constructing a simple river model: Chapter 1 Starting ISIS and Basic Concepts explains how to start your ISIS software and goes through some basic concepts. Chapter 2 How to Run an Existing Model shows an example of running an already prepared model, in this case it is a model of a tidal river. Chapters 3, 4 and 5 How to Build a Single Channel, How to Build a Simple Network and How to Add Weirs to the River Model illustrate the principles of building common elements of river models, such as a single channel, a simple network and adding weirs. Chapter 6 How to Run a Flow Model focuses on the steps needed for running a flow model. This chapter contains a more general explanation of model running than that provided in Chapter How to Run an Existing Model. Chapter 7 How to View Simulation Results describes the steps needed for the visualisation of the results of the ISIS simulation. Chapter 8 Further Information describes the additional tools and resources which ISIS suite of software offers. Chapter 9 e-learning River Hydraulics with ISIS Educational Resource describes one of the additional resources - the educational resource available on This tool will help users learn about hydraulic modelling of flows in open channels, such as rivers, spillways and canals. 1. Starting ISIS and Basic Concepts Starting ISIS Once you have installed the software you will be ready to use ISIS. Users who have purchased a licence may need to copy the ISIS licence file (isis.set) into the <ISIS>\bin folder (eg c:\isis\bin) and attach the hardware key or dongle. Then, from the Start menu, select Programs, then select the ISIS group and click on the ISIS icon. If you are using the Network Licence please follow the instructions in the documentation provided with your licence file. If you have any questions please do not hesitate to contact ISIS support (details are at the foot of this page). The main user interface of ISIS is the Network Properties Window, which opens automatically every time ISIS is launched. The Network Properties Window is used to enter and view the details of model components such as river channels and weirs, the initial and boundary conditions and the connectivity of the hydraulic units that make up the model. Basic Concepts ISIS can be used to model flows and water levels in open channels and floodplains. A wide range of structures, including bridges, sluices, culverts, pumps and weirs can also be modelled. An ISIS model is constructed using a number of different hydraulic units, which can be thought of as building blocks that are connected together. In most cases, an ISIS model must have the following three types of unit as a minimum: Upstream boundary: to represent the flow entering the model. Downstream boundary: to represent the downstream water level. At least 2 river/routing/conduit sections: to represent the river channel. Page 3

5 Each unit contains model data appropriate to the unit type, e.g. a River Section unit contains cross-section geometry and roughness data for the river. Units also contain one or more node labels in order to be able to identify the unit and to be able to define the connectivity with other units in the model. Units with the same label are automatically connected. River Section and Conduit units are connected together in the order in which they appear within the Network Properties Window, from the beginning to the end of the particular channel reach (the end of a river reach is signified by a zero distance step in the last River Section unit). Please note that in this quick start guide we use the shorthand > Name to mean click on the menu item called 'name', for example> File > Open' means click on the menu item File then click on submenu item Open. Files ISIS uses a range of different files to manage model data and results. The most important ones are:.dat files: These contain all model data and can include initial conditions..zzs files: These contain initial conditions only..ied files: These contain alternative boundary or event data (optional)..ief files: These contain the simulation parameters, including name and location of the model data file, start and finish times, timestep etc..zzn files: These contain the raw simulation results in binary format..ixy and.gxy files: These contain the schematic visualiser and GIS visualiser information, respectively. 2. How to Run an Existing Model The chapter shows an example of running a model simulation using the model that has already been prepared. There is a number of existing examples placed onto the <isis> folder of your machine during the installation of ISIS. The default location for your isis is C:\isis\data (if ISIS is installed at a location other than the default folder, it will be xxx\xxx\isis\data where xxx stands for where ISIS is installed). This Chapter will explain how to access the ISIS sample file, interpret what it represents, show the way we can run the simulation based on this file and will help you go through the results obtained during this simulation. Page 4

6 1. Launch ISIS. The ISIS user interface is shown on Figure 1. Figure 1. ISIS user interface 2. Open an example file > File > Open or click the open icon, then browse to the isis\data folder, open the file called TIDAL.DAT. Click No when it asks you to load the water quality data (here we are just going to run a flow model without a water quality component - please note ISIS FREE cannot operate with the water quality). After loading the tidal model the ISIS user interface should look like that shown on Figure 2. Figure 2. The model contained in tidal.dat file shown in ISIS Network Properties window This is a model for a river with a strong tidal influence. Before the simulation is run, let's view the model of the river in the Visualiser and look at the representation of the boundary conditions. Page 5

7 3. View the river model in the Visualiser. To do this, click the Visualiser icon or select > Tools > Visualiser from the main menu, click 'Ok' when the coordinate dialogue appears on the screen. Now Figure 3 shows the representation of the model contained in the file TIDAL.DAT in the Visualiser. The user can see that the river in this model is a straight single channel. ISIS actually contains three options for plan views of the model: Visualiser - for simple schematic views of the model GIS Visualiser - this can show either a schematic view or a 2D 'real world' GIS view with raster and vector data as background images ISIS MAPPER - for 2D and 3D 'real world' GIS views of selected ISIS data along with raster and vector data. ISIS MAPPER also includes functions for model building and flood mapping. Figure 3. The model contained in a sample file TIDAL.dat shown in the Visualiser Tool of ISIS 4. View the longitudinal profile of the channel. To do this, close the Visualiser and go back to the main ISIS user interface. Select all the river section units by first selecting the first unit in the model (node 2.1) and then scroll down to the end of the model (label 3.38) and press the <Shift> key together with the left mouse button. Then, right mouse click the selected sections and choose 'Long Section' (or use <Ctrl + L> short cut key or click the long section picture icon ). Select Plot to generate the graph. The long section profile that you should see at this stage is shown on Figure 4 (if the blue area is missing then this indicates that model results are not yet available - we will be generating results later in this section). This picture clearly shows the varied bed profile as well as the water level rising to the left of the screen. You can see that most of the water in this figure is actually below the sea level (shown by the mark 0 on elevation scale in the left-hand side of the graph). Page 6

8 Figure 4. The plot of the longitudinal profile of the river represented by the model in TIDAL.DAT file 5. View the downstream boundary condition. Go back to the main ISIS user interface of the tidal model shown on Figure 2. Double click the HTBDY unit 3.38 (HTBDY is the ISIS shorthand for Head Time BounDarY). Click the 'Plot' button of the dialogue that appears. It will show you the plot of the water level - time series of the downstream boundary condition of the model in the TIDAL.DAT file. This plot is shown on Figure 5. You can see that the downstream boundary condition for this model is of a tidal nature. Figure 5. Plot of the downstream boundary condition of the model in the TIDAL.DAT file showing a typical tidal time series We can also view the upstream boundary condition using the same procedure, but choosing the upstream boundary condition node (2.1) - you will have to close the HTBDY data form first by clicking on its Cancel button. This boundary condition is represented by a constant flow of 100m 3 /s. Page 7

9 6. View one of the cross sections. Double click one of the river section units (for example section 2.12), click the 'plot' button of the dialogue that appears on the screen, then you should see the graph of a cross section on the screen. In the right hand side of the plot you can see the cross-sectional profile of the river with a flood wall on the right hand side and to the left of the river you can see a flood plain (250 m wide) with a steep hill on the left-hand side. Cancel the view of the cross section data. Figure 6. Profile of the cross section 2.12 of the model in the TIDAL.DAT file 7. Run the simulation. Click the 'flow simulation' icon or select > Run > Flow simulation. A flow simulation run form interface will appear as shown by Figure 7. Figure 7. The interface for running the model in the TIDAL.DAT file Select the Unsteady (Fixed Timestep) button, set the Finish time to 36 hours and set both the Timestep and Save interval to 360 seconds. Click Run. Click Exit after the simulation completes (see Figure 8) and Close the run model scenario dialogue without saving Scenario data (Figure 7). Page 8

10 Figure 8. The ISIS window showing the completion of unsteady simulation run of the model in the TIDAL.DAT file 8. View the results. First let's view the water level time series at one of the river sections. It should be a tide graph similar (but not identical) to the one of the downstream boundary condition shown by Figure 5. To do this, right click one of the river sections (for example section 2.26) and select time series and click 'Plot'. The water level result at this section will be plotted. It is shown by Figure 9. Figure 9. Time series plot for one of the river sections of the model in the TIDAL.DAT file Using the ability of ISIS to animate the results we can watch a dynamic animation of the changes of the water level with time on the longitudinal profile of the river. To do this we have to plot the long section of the river (the way to plot this are explained in step 4 of this Chapter), right mouse click inside the long section and click 'animation', then click the Play button ( )on the animation toolbar at the top of the screen. The simulation results of the model in TIDAL.DAT will be animated. Figures 10 to 14 illustrate the changes of the water level in the river represented in the file TIDAL.DAT in the course of the simulation described earlier. You can see that the changes of the tidal cycle along the river. Page 9

11 Figure 10. Water level at T=0h Figure 11. Water level at T=3h Figure 12. Water level at T=6h Figure 10. Water level at T=0h Figure 14. Water level at T=12h 3. How to Build a Single Channel This chapter explains the ways of building a model representing a single channel, i.e. a reach of river that is not branched. A single channel contains at least four units: upstream boundary condition, downstream boundary condition and two sections to represent a channel. Figure 15 shows a very simple channel with eight cross sections. QTBDY is shorthand for the discharge (Q) Time series boundary condition (for the upstream inflow to the channel). HTBDY represents the water level time series boundary condition for the downstream end of the channel. Page 10

12 Figure 15. A schematic representation of a single channel with eight sections and two boundary conditions In order to build such a channel, we have to follow the following steps: 1. Start a new (blank) model in ISIS (> File > New) 2. Insert a Flow-Time Boundary (QTBDY) unit to represent an upstream boundary. To insert this unit you can either click on the Flow-Time Boundary picture button or select > Edit > Insert > Boundaries > Hydrographs > Flow/Time from the main menu. When the Node label editor dialog appears, enter the label S1 (in upper case), and click 'OK'. Save this file with a proper name (for example, singlechannel.dat) and choose the location on your computer to place a copy of the file. 3. Specify the data for the boundary condition. Double click on the newly inserted unit to display the data entry screen for the boundary. Enter the flow data into the Flow-Time table. As shown by the example below: let's enter a simple hydrograph, peak flow 20m3/s, base flow 10 m3/s and time to peak is 12 hours. Remember to make sure that the unit of the time is hours (by default it is seconds ). Figure 16. Flow-Time data entry form. Page 11

13 4. Insert a River Section unit. To insert this unit you can either click on the River Section picture button or select > Edit > Insert > Channels > River > River Section from the main menu. When the Node label editor dialog appears, enter the label S1 (in upper case) and click OK. Figure 17. Connection of a river unit to a QTBDY unit 5. Click 'Yes' when asked whether you would like to connect the S1 labels. This River Section unit is located immediately downstream of the Flow-Time Boundary (hence the node labels of these units are the same). 6. Enter the cross section data. Double click on the newly inserted unit to display the data entry screen for the River Section. Enter the cross section data into the table, leaving the rest of the parameters in the table at their default values: Figure 18. Specification of the cross section data 7. View the cross-sectional profile of the cross-section by clicking on the Plot button. In this simple example we have used a triangular cross section. Page 12

14 Figure 19. Plot of the cross section profile 8. Specify the distance between the cross-sections. Enter a certain value for the 'distance to next section' field, for example 100 metres. 9. Specify the cross-section data for all the cross-sections. Repeat the same procedures 8 times to insert 8 river sections, name them S1 to S8 (to save time you can use copy and paste). Note that: the last section must have a 'distance to next section=0', this is used by ISIS to recognise it as the last section of a channel reach. 10. Specify the information for the downstream boundary condition. For the last channel section a HTBDY boundary condition unit is inserted in a similar manner as the first QTBDY boundary condition unit (by clicking the picture icon, and prescribing the time series data in the table, for example a constant water level of 2 meters). Figure 20. The Stage-Time data entry form for the downstream boundary condition S Visualise the river model. After building the single channel, we can use Visualiser to visualise the channel that we have just been build. This is done by clicking on the Visualiser picture icon or select > Tools > Visualiser from the main menu. Note: Please remember to save your file. For the information on how to run a simulation and view the results please refer to other sections of this quick start guide. Page 13

15 4. How to Build a Simple Network This chapter describes the way of building a model of a branched river (i.e. a river network). The example river network consists of a main channel and tributary channel (Figure 21). Figure 21. A schematic representation of a simple network. For the main channel, S1, S2...S8 are the labels for its cross-sections. T1, T2, T3 and T4 are the labels for the tributary channel. As shown in Figure 21, a junction should be built to link the main channel and the tributary at section S4. In order to insert a junction at section 4, we have to split section S4 into two sections: S4Up and S4Dn. Then we should place the junction in between S4Up and S4Dn. Please note that we specify the field distance to next section for S4up section as 0, which physically means S4Up and S4Dn are the same section. The detailed procedures of building a simple network are described below: 1. Start ISIS and begin a new model. 2. Build the upstream boundary condition unit (by clicking on one of the icons of the Boundaries Tool bar eg QTBDY boundary icon ). It should be built in the same manner as described in Chapter 3 "How to Build a Single Channel". Here we will name this QT boundary as S1. Save the file with the name simplenet.dat. 3. Specify the hydrograph for the upstream boundary condition unit. Double click on the QTBDY unit in the Network Properties window in ISIS. Enter the time series in the QTBDY boundary table that opens, for example, take the same hydrograph as described in the Step 2 of Chapter 3 "How to Build a Single Channel". Figure 22. Flow-Time boundary data entry form for the upstream boundary condition 4. Build the first cross-section S1. You can do this by clicking the River Section picture icon ; enter input cross section data in the table that opens on the screen. Page 14

16 Figure 23. Cross-section data entry form 5. Build sections S2, S3, and S4Up in the same manner as for S1, please note that the S4Up should also have the distance to next section field set to 0, which means S4Up and S4Dn are same location. 6. Build the Junction and connect this junction to sections S4Up, S4Dn and T4 (S4Dn and T4 will be built later on). To do this, either click the Junction unit icon > Insert and then > Junction > Open Junction or select > Edit Figure 24. Connecting the river units to a junction unit using the Node label editor form 7. Build sections S4Dn, S5 to S8 (cross section shapes can be the same or different). 8. Build downstream boundary condition (say HTBDY) for the main channel S8 and link it to section S8. The stage-time boundary can be a constant of 2 metres. 9. Build tributary sections T1, T2, T3 and T Build the upstream boundary condition (QTBDY) for the tributary T1 and link it to the section T1 (by having the same label). Page 15

17 Note: Remember that the last section of each branch (i.e. T4) has the 'distance to next section=0' Figure 25 shows the completed model. Figure 25. The completed simple river network model. Note: Do not forget to save your file again after building everything. For running the simulation please refer to Chapter 6 How to Run a Flow Model of this quick start guide. 5. How to Add Weirs to the River Model This chapter describes the way a user can model hydraulic structures such as weirs in ISIS. ISIS can deal with various types of hydraulic structures; the general weir unit is one of the most often used structures. The Figure 26 shows a simple channel with a weir built in: Figure 26 (above). A schematic representation of a weir built into a river model In order to place a weir in an existing modelled reach, we first split our river reach into two (ending the first reach with a 'distance to next section=0') and place the weir between the two sub-reaches. The figure on the right illustrates how this can be done in ISIS. Figure 27 (right). Visualisation of the channel with the weir between sections S3 and S5. Page 16

18 Detailed procedures to build a weir in the channel are covered below: 1. Start ISIS and start a new model (or copy an existing single reach model and adjust the following instructions to suit). 2. Build an upstream boundary condition unit, for example a flow-time unit S1 (see Step 2 in Chapter 3 "How to Build a Single Channel"). Save the model file as the name Weir.dat. 3. Prescribe the time series in the QT boundary table in the same manner as described in Step 2 of Chapter 3 "How to Build a Single Channel" or Chapter 4 "How to Build a Simple Network" of this guide. 4. Build the first river section S1 and connect it to the boundary unit S1 we have just built (as described in Steps 4 and 5 of the Chapter 3 "How to Build a Single Channel"). 5. Build sections S2, S3, and S4Up in the same manner as described in Chapter "How to Build a Single Channel". Please note that the S4Up has the field distance to next section set to 0, which means S4Up and S4Dn are same section. 6. Build the weir after section S4Up and input the upstream label as S4Up and downstream label S4Dn. To do this, either click the general purpose weir icon or select > Edit > Insert then > Structures > Weirs > Weir. Figure 28. Connection of the weir unit to the river model using the Node label editor For the configuration of the weir parameters you should specify the elevation of the crest and the breadth of the crest. Other parameters can be left with the default values. To do this, double click the weir unit and the Figure 29 will appear on the screen. Page 17

19 Figure 29. Entry form for the parameters of the unit Weir 7. Build sections S4Dn, S5 to S8 (cross section shapes can be same or different) as it was done in Chapter 3 How to Build a Single Channel. 8. Build the downstream boundary condition (for example HTBDY) for the main channel S8 and link it to section S8 (as described in Step 10 of Chapter 3 How to Build a Single Channel). 6. How to Run a Flow Model This Chapter describes how to run of an ISIS model. Some details of running a flow model were given in Chapter 2 How to Run an Existing Model; this Chapter provides more information. To run a simulation in ISIS you should follow the steps below: 1. Start ISIS 2. Load the model. As an example we can load the simple channel model we built in the Chapter 3 "How to Build a Single Channel" of this guide. Select > File > Open and browse to the folder that contains the.dat file (ISIS model file), select it and click Open. Note: before starting the simulation, all the boundary condition data and cross section shape data must be prescribed. For this example, we can use the following information. It is a straight rectangular channel with a length of 700 metres. The shapes of the cross sections, upstream QTBDY and downstream HTBDY are shown in Figure 30. Figure 30. Key model data (from left to right): downstream boundary condition; upstream boundary condition and cross section data Page 18

20 3. Click the 'Flow simulation' icon or select > Run > Flow simulation. A flow simulation run form interface will appear. It is shown on the Figure 31. Figure 31. Run form interface In this example we will only deal with the 'Times' tab which has a button named 'Run' on the bottom left side. Detailed information about the tabs and buttons of this form can be found at > Help > Contents > Using ISIS > ISIS user interface > Run Forms Interface. There are five simulation types displaying on the 'Times' tab. For this simple river channel model, the 'Steady (Direct)' and the 'Unsteady (Fixed Timestep)' options are used. These two types are explained in more detail below. It is highly recommended to run a steady simulation before the unsteady one. 4. Running a steady simulation. Select 'Steady (Direct)' simulation type and click on the 'Run' button (or go to Run > Flow simulation in the ISIS run Scenario screen). After that a window will appear on the screen, which will show the progress of the simulation. After the simulation finishes, a message simulation completed will appear. After that you can view the steady simulation results by clicking the 'View' button. If there are errors during the simulation, the process will stop and an error message will be shown. For more on viewing the results please refer to the Chapter 7 How to View the Simulation Results of this guide. Page 19

21 Figure 32. Notification of the successful completion of a simulation 5. Running an unsteady simulation. Select 'Unsteady (Fixed Timestep)' simulation type. Enter the 'start time' and 'finish time'. The time span for simulation must be within the range of the shortest time span of the boundary conditions which are defined in the model set-up step. Also, the time step and save interval should be defined (for example 10s for time step and 60 s for save interval). 6. Click on the 'Run' button (or go to Run > Flow simulation) after prescribing the parameters for the unsteady simulation. A window will pop up showing the simulation process and some important figures for the model (see Figure 33). Page 20

22 Figure 33. The progress of the unsteady simulation in ISIS 7. After finishing the unsteady simulation, the summary outputs can be viewed in the form of plain text. However, other methods for visualisation of the model results can be used. Please see Chapter 7 How to View the Simulation Results of this guide. 7. How to View the Simulation Results This Chapter describes how to view the ISIS model results generated from a simulation. Normally both steady and unsteady simulation results are stored in the same folder that the model has been stored in. Following the example used in Chapter 3 How to Build a Single Channel and Chapter 4 How to Run a Flow Model, it will be the single channel model. The steady simulation results are stored in an ASCII file which has an extension of.zzs. Please note that this file can be viewed and modified in a normal ASCII editor like Notepad, WordPad, etc. In order to view the steady simulation results, you can browse to the folder where you stored your model. Figure 34 shows an example of a.zzs opened using the WordPad. Figure 34. An example of a.zzs steady results file opened in Wordpad Page 21

23 In this file flow (m 3 /s), stage (m elevation) and other information such as Froude number and velocity are recorded for each channel section. The unsteady results are stored in a binary file which has an extension of.zzn. This file cannot be opened in an ASCII editor and we must use ISIS to view the results. The following options are available for viewing the results - the first three are described in this guide: Time series plot in the form of water levels and discharges at each section. Long section profile of the water levels Animations of the long section profiles of the water levels Cross sections with water levels displayed X-Y plots, eg rating curves Tabulated results generated from the ISIS TabularCSV tool 2D and 3D flood maps created in ISIS MAPPER Viewing the ISIS simulation results by means of plotting the time series 1. Start ISIS 2. Load the models for which you have the results of the unsteady simulation run. Select > File > Open and browse to the folder that your model files are stored in. 3. Right click the section for which you would like to plot the time series and select 'Time series' (or select the section and use the <Ctrl+T> short cut key). Figure 35. Selecting the Time Series option for plotting ISIS results 4. Selection of the variables of a cross-section to be used for the plot. After selecting the time series tool, a form Time Series will appear allowing you to choose what type of data you want to plot. Let's select the variable Stage and plot it (you may choose to plot other variables such as Flow, Froude Number etc as well). Page 22

24 Figure 36. The Time Series Form which allows the user to choose the variables to be plotted (left); plot of the times series for the water level time series for the results of an unsteady simulation run (right) It is possible to add several time series on the same plot, which is very useful for model calibration. This can be done by right clicking the time series you just plotted and selecting add time series and choosing the appropriate time series. Viewing ISIS simulation results by means of plotting the Long section profiles 1. Repeat the steps 1-4 mentioned above. Then select at least two of the cross sections. This can be done by holding down the <shift> button and clicking the left mouse button. Click the right mouse button on the selected sections and choose 'Long Section' (or use <Ctrl + L> short cut key). Figure 37. Choosing the Long Section option for plotting ISIS results 2. Select Stage and plot. The Long Section plot should look like shown on Figure 38. Page 23

25 Figure 38. Plot of the long section profile of the results of an unsteady simulation run The area in blue shows water that filled the sections S2 till S4; the particular time step for this water level is indicated on the title of this figure - 0 hours (beginning of the simulation). Viewing ISIS simulation results by means of an animation Right click the Long section you have plotted (details above), select 'Animation' and the animation tool window will appear, as shown on the Figure 39. You can click the 'Play' button to view the animation of a selected variable (in this case water level ). Figure 39. Animation of a long section water level profile For more information about the Graphical Output and animations please refer to the ISIS help file in the section Using ISIS > Graphical Output. Page 24

26 8. Further Information A full description of the functionality within ISIS is provided in the other parts of this help system. In addition CH2M HILL provides training courses to help you get the most out of the software - for further details on training courses please visit: This quick start guide should have provided you with an introduction to how to use ISIS. ISIS is a complex simulation and visualisation package which has many options and features not discussed in this guide. For example, since version v3.0, ISIS has included ISIS MAPPER, a free tool that allows 2D and 3D visualisation, automated generation of input files and production of flood maps. It can be accessed by clicking the ISIS MAPPER icon or selecting > Tools > ISIS MAPPER. For more information on how to use ISIS MAPPER, refer to the ISIS MAPPER section of the help file. The ISIS User Community website ( provides lots of useful information about ISIS including manuals, frequently asked questions, downloads and forums. 9. e-learning River Hydraulics The e-learning resource is intended for people wanting to learn about hydraulic modelling of flows in open channels, such as rivers, spillways and canals. It uses ISIS as a virtual lab to explore simple hydraulics, providing users with an understanding of the principles behind hydraulic modelling and its use in flood risk management. The tool is located on the Online ISIS User Community website ( and can be found under the Learning section. By the end of the course, users should have an understanding of the hydraulic behaviour of simple open channels, and will also be able to build simple models using ISIS. The resource can also be used as a quick introduction to the ISIS modelling software for people with previous hydraulic modelling experience. The course covers 1. Steady Uniform Flow 2. Energy and Momentum Principles 3. Steady non-uniform Flow 4. Unsteady flow The course also includes various video tutorials instructing users to build simple ISIS models. The model building activities covered by the course include: Building a simple channel model and running a steady simulation Building a model for a non-uniform channel Simulating hydraulic structures Crump (triangular profile) weir Vertical sluice gate Bridge losses Culvert flow Modelling unsteady flow User can download data for the exercise examples and are presented with quizzes to help confirm knowledge. Users should work through the topics sequentially. Extra background on hydraulic principles and the ISIS model is given on the right hand side of each page. Page 25