There are four ways to create a design storm in Resource Library which are corresponding to different scenarios.

  1. Manual Input is used for the case where the design storm will be created from scratch. It gives the flexibility to add, insert, modify, and delete the time series data directly. Although it also supports copy-and-paste from other sources, it is not recommended to use manual in-put for that case. Read-in should be used instead.
  2. Read-in is designed for an existing design storm, which may be exported from another design storm tool or modelling software. Two file formats are supported which are stm and csv.
  3. Chicago is used to create a Chicago design storm based on given parameters including IDF curve. It is often used for cases where model needs to run on Chicago design storms from IDF curves with different return period. It is recommended to add the IDF information into the library first and then create the design storm.
  4. Mass is used when a mass curve file and total precipitation is available. Examples are SCS Type II and AES design storms.
  5. SCS Type II is used to create a 6-hr, 12-hr or 24-hr SCS Type II design storm.
  6. AES is used to create a 1-hr AES design storm.

To create these design storms, click the corresponding button in toolbar or choose the corresponding menu in the context menu as shown in the figure below.

New manual input and Chicago design storms will be added immediately and set as the active item. A window will appear for Read-in and MASS design storm for user to preview the data be-fore its added into the library.

Chicago, SCS Type II and AES design storms can also be created based-on IDF Group as shown in the figure below. The design storms are created for each return period in the IDF Group.

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