No catchment defined. Click on the polygon tool to define a catchment.
This software is a design tool for the estimation of rainfall runoff using the Probabilistic Rational Method.
By default the time of concentration is calculated using the Pilgrim-McDermott formula (area based), with design rainfall depths obtained from the BOM 2016 IFD service
Click the save model button to download a JSON file (*.json) which contains all of the catchment data, coordinates and IFD data in a GeoJSON format. This can then be reloaded onto the page for future analysis or editing of the model.
The software accepts uploads in ESRI shapefile (uploaded as a zip folder), along with GeoJSON, TopoJSON, kml and gpx files which can be optionally loaded in as catchments. Any pre-existing properties/meta data of the uploaded files will be maintained and preserved into the resulting GeoJSON file. This allows for any existing models in Shapefile format to be updated to suit ARR 2016 design methods.