Definition of Project Types / Scales
The first decision that a user must make is to select the Project Type that represents the project application.
- WBM for the Site – this is focused on single lot scale analysis, and will be especially relevant to redevelopment scenarios where on-site measures for rainfall volume capture are of interest.
- WBM for the Neighbourhood – this is the scale where multiple lots in close proximity are of interest, and will be especially relevant to the assessment of regional or neighbourhood facilities for rainfall volume capture and/or runoff rate control
- WBM for the Watershed – this is the scale where watershed behaviour and mass balance maintenance is considered for the whole watershed tributary to some receiving point of interest, such as a stream or discharge point.
The value-added dimension to the WBM resides in the “neighbourhood with a stream” and “watershed with a stream” applications. These incorporate the Stream Health Methodology and enable practitioners to focus on the cause of stream impacts, and determine how best to optimize the selection and design of appropriate rainfall capture mitigation measures.
The model can be used to simulate the outflows from two catchments within a watershed. In addition to Project Types, the tool allows users to simulate four situations that integrate the site with the watershed and the stream.