ARR87 example at Penrith, run with 2016 IFD rainfall inputs and ARR design procedures

The file for this example is Penrith ARR87 Example - Lite.drn, located in the folder C:\ProgramData\Drains among the Lite examples. If this folder is hidden, in File Explorer select the View tab and tick the Show Hidden Items box to make it visible.  

This example, shown below, models the top five pipes in the pipe drainage design example from Chapter 14 of Australian Rainfall and Runoff (Institution of Engineers, Australia, 1987), performs design and analysis with 10% and 1% AEP ensembles of storms. Overland flow paths in the sub-catchments are defined in detail, using a kinematic wave + additional time calculation, rather than a constant time of entry. You can explore the drainage system.

This model can be run with Horton (ILSAX), ERM and IL-CL hydrology, with the three methods giving quite different results. The IL-Cl model 'remaining' area has a high initial loss of 40 mm, based on the high rural initial loss for the site (57 mm) specified by the ARR Data Hub. It gives results between those of Horton (ILSAX) and the ERM. No allowance has been made here for preburst rainfall, however, when applying the IL-CL model appropriate values should be obtained from the ARR Data Hub.

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