Rainfall is the starting point for almost all stormwater simulations. The terms “rainfall”, “storms”, and “precipitation events” all have the same meaning in this tutorial. Rainfall data consists of a two column table containing a time step (usually in hours) and either total precipitation (in or mm) or intensity (in/hr or mm/hr).
Stormwater models use two types of rainfall data:
The user interface can utilize storms of any duration. A single data file can contain multiple storm events. These files consist of dry periods (rows with zero precipitation) between wet periods (rows with nonzero precipitation).
There are four methods of adding rainfall data to a model:
In this tutorial, the first method will be presented.
|Objectives||Create a design storm from a template|
Each installation of the application contains template files (*.xpt) with standard data used to build models. This example demonstrates an application of the dimensionless storm temporal pattern for Sydney. As per the Australian Rainfall and Runoff manual, Sydney is in Zone 1.