WILLIAMS RIVER AT TILLEGRA Station number 210011 Latitude -32.32 Longitude 151.69 Data owner NSW - NSW Department of Industry, Skills and Regional Development – DPI Water The catchment area is 195,7 km2 There are 7 rainfall stations across the catchment as shown in Figure 1. The rainfall depth and flow data at these gauges are in RainfallData.xls and Flow210011.xls 3 rainfall events are selected for model calibration and validation. Once the model parameters have been defined, the model can be applied to generate the design flow from design storm. The catchment modelling system has been set up in HEC-HMS (version 3.5 or later). There are some steps of how to use the model to generate flows for this assignment. 1. Install HEC-HMS version 3.5 or later Click to the file HEC-HMS_35_Setup.exe to install the model 2. Open the model 3. Click icon open to open the project 4. Select Browser and choose the link to the project folder: D:\.... \Assignment2016_modelling\CatchmentModelling Select the file: Catchment210011.hms and open the project5. Catchment system includes 4 main components: Basin models. Meteorologic models; Control Specifications and Time-Series Data. Click to icon "+" next to each model to see components of each models - Click icon Basin Model/Basin 1 to see the catchment network - Meteorologic models include 2 models: Thiessen Polygon and DesignRainfall - Control models includes 4 controls: 2 calibrations; 1 validation and 1 DesignStorm - Time-Series Data include rainfall and flow data for modelling. 6. Running the model: - Click to icon "Compute" to change the interface to simulation runs- Select Run Calibration 2009 to select the Simulation - Right click to the "Run Calibration 2009" and select the "Compute" - Repeat these steps for Calibration and validation process. 7. The Results - To see the results of simulation at catchment outlet click to icon "Results" to change the interface - Click to icon "+" next to Simulation Runs: at this step, there must be 3 simulation runs high lighted. - Click to each of runs and Subbasin-1 - Click to Graph to see the simulated hydrograph, Summary table or Time-series Table. Here you and copy the figures and table for your report.8. Simulate the design flood hydrograph - Back to the main interface by clicking "Components" - Click the icon "+" next to the "Time-Series Data" to input the design rainfall storm - Click the icon "+" next to the Precipitation Gages - Click the icon "+" next to the "Design Rainfall" - Click time series. "Time window" will be shown in the left bottom conner - Type the start Date and End Date and time into "Time Window". The exact date is not important however the time step must be correct. - Click "Time-Series Gage" and check the Time Interval: this time interval will depend on your design rainfall data. Select the appropriate interval. - Click "Table" to change the interface to table - Copy and paste your rainfall series in this table. - Click "Save" to save the project9. Check the Control Specification - Click "Control Specification" / "DesignStorm" - Input the Start time and End Time of your Design Storm - Input the simulation time by selecting the option in "Time Interval" - Click Save 10. Running the model - Click "Compute" to change the interface - Click "Simulation runs"/ "Design Storm"- Right click and select "compute" - To see the results, click '"Results"/Simulation Runs/Select "Design Storm"/Subbasin-1/ or junction - Select the information which is needed for your report and analysis 11. Calibration This model system has 4 sensitive parameters: Initial lost; continuous lost rate; catchment roughness and channel manning. You can find them by: - Back to Component interface - Click "Basin Model"/Subbasin-1, the catchment lost and transform method will be shown in the window below - Click "loss 1" to find the Initial and Constant rate of lost model. - Click Plan 1 to see the catchment roughness - Click Channel to see channel manning coefficient - Feel free to change values of these parameter, but keep in mind that they must be in acceptable ranges. Remember to save each time you make a change. - Click "Compute" to run the model and Results to check the model results each time of changing parameter values. The software has a tool for create optimization trial, please see the user's guide for more detail following the link http://www.hec.usace.army.mil/software/hec-hms/