The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Bureau of Meteorology:
The Bureau of Meteorology's official Water Storage application.Find how much water is available in Australia, your state, capital city and for individual storages.This application reports storage information for more than 250 publicly-owned storages around Australia.See current water levels by percentage or volume in megalitres (ML). Compare current levels to the previous calendar year. Tap to see the change from the previous day, week, month or year. Shake to refresh.Turn the device on its side for a full-screen graph, showing this year and last year. Touch to see values for any day of the year.Add places of interest to your Favourites list. Tap any place for the full details.From a nation-wide summary, select information on states and territories, cities and supply systems and individual water storages.Find any place by typing the first few letters of its name.