The Australian Representative Basins Model (ARBM) was originally developed by Chapman (1968) to describe catchment infiltration and subsequent rainfall excess for a particular rainfall sequence plus catchment antecedent condition.

To utilize this module, additional data describing such things as sorptivity, hydraulic conductivity, upper and lower soil storage capacities, soil moisture redistribution, groundwater runoff, and catchment drying are required.

The sensitivity of various parameters to the derived watershed runoff varies widely. Thus, a sensitivity analysis should almost always be performed to assess the critical parameters involved in the catchment calibration.

In using this loss module in an event mode, it is still necessary to provide soil moisture starting conditions prior to a design event. To achieve this some knowledge of appropriate antecedent conditions before the typical design event is required. If this information is not readily available then several values should be chosen and a sensitivity analysis carried out.

A diagrammatic representation of the LOSS Module is shown in the figure below.

The other tabs in the ARBM Losses dialog box are:

Additional Info:

Typical ARBM Parameters for Canberra Catchments