Known Rainfall

Known Rainfall allow the flexibility of analyzing unique hyetograph data and historical rainfall gauge data.

Creating a Set

A set of rainfall records is produced using the spreadsheet and buttons provided.

Event

Spreadsheet

Use - Checkbox to indicate if the event should be run as part of the analysis.
Note: At least one record must be turned on for the analysis to be run.
Label - The label to be used for the storm, which will be shown on the results and Storm Selector.
Note: This is read only, as it is taken from the rainfall record entered.
Duration - Length of the rainfall event entered.
Note: This is read only, as it is taken from the rainfall record entered.

Run Time - The length of the analysis that will be run. Typically this will be length of the rainfall record entered, however this can be overruled by entering your own run time manually. Setting the Run Time to 0 will un-tick Use so the event is not run.

Buttons

Add - Adds a new row to the table and displays the rainfall record form ready for the rainfall data to be entered.

Edit - Allows the current selected rainfall record to be edited. The rainfall record form is displayed so that the rainfall data can be changed.

Delete - Deletes the currently selected rainfall record from the table.

Clear All - Clears ALL of the records from the table.

Increase Rainfall

This will scale all rainfall by the amount specified. This can be used to take climate change, or other factors, into account.

Editing Rainfall

The Rainfall Record form allows a Rainfall event to be entered manually or loaded from file.

The rainfall record can have variable time steps and cover a period of over 100 years, and it can be entered/loaded as Depth or Intensity values. When showing intensity values the time step for a value is taken as the time between the current value and the next.

The following list shows an example data set:

Time (min) Depth (mm) Calculated time Step (min) Intensity (mm/hr)

00:00

1

2

30

00:02

36

60

36

01:02

4

5

48

01:07

4

5

48

If the last value is not zero its time step is taken as the time to the previous value.

Toolbar

New - Allows a new rainfall record to be created based on a duration and a fixed time step. The following items describe the values that can be entered on the calculator form that appears.

Load - Allows a rainfall record to be loaded from file. These include:

Note: The .redx and .red files may contain multiple rainfall profiles, in which case a Profile Selector form will be displayed to allow a specific profile to be loaded.

Save - Save the current rainfall event to .idredx file so it can be reused elsewhere.

Label

This is the label given to the rainfall record. i.e. 30 minute storm. If the data is created from the New option, the Label is set to the duration. If the data is loaded from a file the Label is set to the data file name.

Spreadsheet

Shows the data in a paged format which can be edited, or as a graph.

Data Table

Graph - Shows the current data page as Depth/Intensity against time.

Start Date - Start date of the event. Clicking the Select a date button will show a calendar form.

Note: This can be left blank.

Start Time - Start time of the event. Clicking the Select a time button will show a time selector form.

Note: If Start Date is blank this value is ignored.

Run Time - The event duration that will be used for analysis. By default, this value is set to the event duration. If Run Time is zero the event will not be used by analysis.

Show as - The data can be viewed as Depth or Intensity values. Changing this setting also sets how the data is plotted on the Print form.

Parent topic: Rainfall Ribbon