In my role on Hawkesbury Council and the Hawkesbury River County Council, I’ve long sought a good visualisation of the entirety of the complete catchment of the Hawkesbury-Nepean River, its feed-rivers, and a distinction between those parts of the catchment laying behind and downstream from Warragamba Dam.
I couldn’t find one, so I’ve made my own, gleaned from a variety of geospatial databases.
This page offers it to you in a variety of formats.
By far the best way to view this is in the free Google Earth Desktop application, available here for Mac and PC.
The map is in what is called an “overlay” in the standard Google Earth .kmz format. The file (4.6Mb) can be downloaded at the following link:
Double-click the file (or choose File… Open) to launch the map in Google Earth.
The overlay is designed to allow you to toggle various colour-coded and labelled components of the system, along with useful boundaries such as the limits of the Hawkesbury-Nepean River and nearby catchments, local government boundaries, etc.
Google are also rolling out a browser-based version of Google Earth, but you must be using the Google Chrome Web Browser to use it. If you are currently using Chrome, click this link to open the same overlay in Chrome, but realise that there many features you will not see owing to the limited nature of the web interface.