--- title: "Adding Storms Using the ARR Storm Generator" canonical: "https://help.innovyze.com/space/xps/19662219/Adding%20Storms%20Using%20the%20ARR%20Storm%20Generator" format: markdown --- The  ARR Storm Generator  allows you input the ARR Data Hub Text File, ARR Temporal Patterns Increments File, and BOM Design Rainfall to produce an XPX file with the Annual Exceedance Probability (AEP) and all of the durations for the given location, which you can then import to  xp swmm  for further analysis. Moreover, the XPX file contains a set of rainfall global database, infiltration global database, and global storm definitions. Accessing the ARR Storm Generator Dialog In the application, click the Edit Global Storms button in the toolbar. In the Global Storms dialog, click the ARR Storm Generator button. In the ARR Storm Generator dialog, click New . Click ARR Data . The ARR Storm Generator will appear. Adding ARR Data into the ARR Storm Generator There are three ways in which you can input the ARR Data Hub Text  file and BOM Design Rainfall file into the application: If you want to use the map in the dialog to download and populate data: Click on the map to select the location and the  Latitude  and  Longitude  coordinate of the catchment centroid will be automatically populated. Alternatively, you can input the  Latitude  and  Longitude .  Select I acknowledge and accept the BOM Conditions of Use , and I acknowledge and accept the BOM Coordinates Caveat . If you want to include very frequent and rare IFDs, select the option for Include Very Frequent and Rare IFDs .  Click Download , and wait until the application downloads the data. Once finished, you will be able to see the Status column says Downloaded for the ARR Data File and BOM Design Rainfall file. If you have downloaded the ARR Data Hub Text File and BOM Design Rainfall file previously into your computer: In ARR Data Hub Text File , click Add from File under Actions . B rowse to the file location, select the file, and then click  Open. In ARR Temporal Patterns Increments , click  Add from File  under  Actions . Browse to the file location, select the file, and then click  Open. In the BOM Design Rainfall , click  Add from File  under  Actions . Browse to the file location, select the file, and then click  Open . If you want to include very frequent and rare IFDs, select the option for  Include Very Frequent and Rare IFDs , and then browse and load these files. If you want to use the ARR Data Hub website and BOM Rainfall IFD Data System website to download data: In ARR Data Hub Text File , click Website and use the ARR Data Hub website to download the file. After the download, click  Add from File  under  Actions . Browse to the file location, select the file, and then click  Open. In ARR Temporal Patterns Increments , click  Website  and use the ARR Data Hub website to download the file. After the download, browse to the file location, select the file, and then click  Open . In the  BOM Design Rainfall , click  Website  and use the BOM Rainfall IFD Data System to download the file. After the download, click  Add from File  under  Actions . Browse to the file location, select the file, and then click  Open . If you want to include very frequent and rare IFDs, select the option for  Include Very Frequent and Rare IFDs , and then browse and load these files. To view the files uploaded, click the  View  option. This will open the file in text format.  To save the file in your computer, select the Save As  option and browse to the location where you want to save the file and click Save . To remove any file, select the Remove option. Click OK . Editing the Properties in the ARR Storm Generator The ARR Storm Generator dialog allows you to edit how the storms will be saved in your XPX file and how it will appear in the application. In the  AEP  section, select the percentage that you want to reflect in the XPX file. By default, all items are selected.  The AEP options in the set [0.5,0.2,0.1,0.05,0.02,0.01] and these are dimensionless probabilities. These will be taken from the BOM’s IFD Data table. Although the Increments file lists AEPs according to ‘Frequent’, ‘Intermediate’ and ‘Rare’, the way to match these up is listed below.Durations can be some subset of [10, 15, 20, 25, 30, 45, 60, 90,120, 180, 270, 360, 540, 720, 1080, 1440, 1800, 2160, 2880, 4320, 5760, 7200, 8640, 10080] and have the units minutes, however you need not include all these durations (some are ‘non-standard’ and might not be included in the default CSV file a user will download). These will be the durations present in both the BOM data table and the ARR Increments file. In the  Durations  section, select the duration that you want to reflect in the XPX file. By default, all items are selected. You may select the  Custom Storm and Ensemble Names  check box to reflect the new storm and ensemble names in the XPX file. To modify the storm and ensemble names: Click the  Custom Storm and Ensemble Names  button   and the following dialog will be displayed: Input the  Item Name Format (for Storms and Rainfall)  and  Ensemble Name Format  fields as necessary. The following formatting macros describe the default file naming convention: Click  OK  and the modified names will be reflected when creating the XPX file. You may select the  Areal Reduction Factors  check box to reflect the new one in the XPX file. To modify the areal reduction factors: Click the  Areal Reduction Factors  button and the following dialog will be displayed: Input the  Total Catchment Area . This is the sum of the areas of all the active catchments in the model.  Select the  Areal Reduction Factor  to use: If you want to use the information from ARR Data Hub, select the  Use Areal Reduction Factor Depths  check box. The  Long Reduction Areal Reductions Factor Coefficients  are provided in the table. You may change the values in the table based on your own data.  If you want to load a file: Select the  Use Areal Reduction Factor Patterns  check box.  In  Select ARF Temporal Patterns CSV , click the ellipsis button. Browse to the location where the CSV file is saved, select the file, and then click  Open . Click  OK  and the new areal reduction factor will be reflected in the XPX file. You may select the  Pre-Burst Conditions  check box to reflect the new one in the XPX file. To modify the pre-burst conditions: Click the  Pre-Burst Conditions   button   and the following dialog will be displayed: Enter your preferred value (integer) in the  Number of Pre-Burst timesteps  field.  This is the number of time steps/increments to put at the front of each of the temporal patterns to simulate the pre-burst rainfall. The depth of this value will be determined by the ratio of pre-burst rainfall to burst rainfall (read from the ARR Datahub text file), and the integer value you entered. The depth to use will be the ratio divided by the number of time steps. For durations less than 60 minutes, the fraction of the one-hour storm will apply linearly (e.g. a 30-minute storm will use half the pre-burst rainfall). For durations greater than 60 minutes but not listed in the table, the results should be interpolated between closest durations that are listed (e.g. the 270-minute storm pre-burst depth should be an interpolation between the 180-minute and the 360-minute ratios). Click  OK  and the modified pre-burst timesteps will be reflected in the XPX file. In the  ARR Data Importer and Storm Generator  dialog, enter a value in the  Base Multiplier  that you prefer. By default, this is set to one.  Click the  Output Options  button and the following dialog will be displayed: You have the option to include any of the following in the XPX file: Rainfall Global Databases Infiltration Global Databases Global Storm Definitions Output the Global Storms to CSV for   xp swmm   2017.1.1 or earlier Note: The XPX file for the Global Storm Definitions may only be imported to  xp swmm  2017.2 or later. You need to generate a CSV file for earlier versions of  xp swmm , which you can then copy and paste into the  Global Storms  dialog. Click  OK . Click View Summary Report  to view the details of the output file in text format. Click View XPX  to produce the XPX file. The location and filename of the output file will be displayed in a window once it is ready. Click OK . Importing the Storms into xpswmm/xpstorm You can use the ARR Storm Generator dialog to add new storms into the application or replace existing storms. In the ARR Storm Generator dialog, select the ARR Storm file that you want to import. Under On Import in the lower left-hand corner of the dialog, select whether to Replace Existing or Add to Existing . Replace Existing - This option will clear out existing rainfall global databases and global storms before importing the newly created ARR storms. Add to Existing - This option will add the new storms in the currently existing rainfall global databases and global storms. If no prior data exists, it will create a new one. Click Import . A progress bar will show the status of the import. Section Pages